A magnetic field created by the electric current causes the compass needle to move. This is the most likely outcome when a magnetic compass is placed adjacent to a basic electrical circuit consisting of a battery, a light bulb, and a wire.
A magnetic field is created around a wire as electricity flows through it. The compass needle moves as a result of the interaction between this magnetic field and the Earth's magnetic field. Consequently, the magnetic field produced by the electric current in the wire causes the compass needle to move when a magnetic compass is put next to a basic circuit comprised of a battery, a light bulb, and a wire. The interplay of magnetic fields and electric currents is employed in numerous applications, such as electric motors and generators, to transform electrical energy into mechanical energy and vice versa.
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a baseball approaches home plate at a speed of 40.0 m/s, moving horizontally just before being hit by a bat. the batter hits a pop-up such that after hitting the bat, the baseball is moving at 54.0 m/s straight up. the ball has a mass of 145 g and is in contact with the bat for 2.30 ms. what is the average vector force the ball exerts on the bat during their interaction? (let the x-direction be in the initial direction of motion, and the y-direction be up.)
The force which the ball exerts on the bat is about 392.173 Newtons. This can be calculated through the velocity change of ball.
What is the force?Initial velocity of the ball = 40.0 m/s, Final velocity of the ball = 54.0 m/s, Mass of the ball = 145 g = 0.145 kg
Time taken by the ball to hit the bat = 2.30 ms = 2.30 × 10⁻³ s
The average vector force the ball exerts on the bat during their interaction is given by the relation: F = (m × Δv) / Δt
where, m = mass of the ball, Δv = change in velocity, Δt = time taken by the ball to hit the bat
Initial velocity of the ball, u = 40.0 m/s
Final velocity of the ball, v = 54.0 m/s
Change in velocity, Δv = v - u = 54.0 - 40.0 = 14.0 m/s
Time taken by the ball to hit the bat, Δt = 2.30 × 10⁻³ s
Mass of the ball, m = 0.145 kg
Substituting the values in the formula: F = (m × Δv) / Δt = (0.145 × 14.0) / (2.30 × 10⁻³) = 0.904 / (2.30 × 10⁻³) = 392.173 N (upward)
So, the force the ball exerts on the bat is 392.173 N (upward).
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the electric field just above the surface of the earth is roughly 100 v/m (over the entire surface) and points vertically downwards. a) calculate the total charge of the earth in coulombs (rearth
The electric field at a distance r from the center of a sphere of total charge Q is given by E=Q/(4πε0r^2). Calculate the radius of the earth R = 6.37 x 10^6 m2. Determine the volume of the earth V = (4/3)πR^33. Use the density of the earth, 5.5 g/cm3 to determine the mass of the earth m = density x volume4. Calculate the total charge of the earth Q = E x 4πε0R^2 Where,ε0 = permittivity of free spaceε0 = 8.85 x 10^-12 C^2 / Nm^2(a) The radius of the earth, R is;R = 6.37 x 10^6 m(b) Volume of the earth, V is;V = (4/3)πR^3= (4/3)π(6.37 x 10^6)^3= 1.086 x 10^21 m^3(c) Mass of the earth, m is;m = density x volume= 5.5 g/cm^3 × 1.086 x 10^21 m^3 × (10^3 cm/m)^3= 5.98 x 10^24 kg(d) Total charge of the earth, Q is;Q = E x 4πε0R^2= 100 (V/m) × 4π(8.85 × 10^-12 C^2/Nm^2) × (6.37 × 10^6 m)^2= 8.86 × 10^11 C.
Therefore, the total charge of the earth is 8.86 × 10^11 C.
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heat transfer that occurs through liquids and gases is called
Heat transfer that occurs through liquids and gases is called Convection.
Heat transfer is the exchange of thermal energy between physical systems. It occurs when there is a temperature difference between two objects or regions of space, causing heat to flow from the hotter system to the cooler one. There are three modes of heat transfer: conduction, convection, and radiation.
Conduction is the transfer of heat through a material by direct contact. In this mode, heat flows from a region of higher temperature to a region of lower temperature. Convection is the transfer of heat through a fluid (liquid or gas) by the movement of the fluid itself. This mode of heat transfer occurs through convection currents, where hot fluids rise and cooler fluids sink.
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what is the interference if: distance between a and b is 10mu distance between b and c is 15mu observed double crossover rate is: 0.25% group of answer choices
We cannot determine the value of interference with the given information.
The interference can be determined using the following formula:
interference = (observed double crossover rate - expected double crossover rate) ÷ (1 - expected double crossover rate).
The expected double crossover rate can be calculated using the formula:
expected double crossover rate = (distance AB × distance BC) ÷ total distance (AB + BC + AC).
Given:
Distance between A and B is 10mu;
Distance between B and C is 15mu;
Observed double crossover rate is 0.25%.
Therefore,
Distance AB = 10mu;
Distance BC = 15mu;
Total distance = AB + BC + AC
Expected double crossover rate = (10 × 15) ÷ (10 + 15 + AC)
expected double crossover rate = 150 ÷ (AC + 25)
The observed double crossover rate is 0.25%.
Therefore, the observed double crossover rate = 0.25% = 0.0025.
Interference = (observed double crossover rate - expected double crossover rate) ÷ (1 - expected double crossover rate)=
[0.0025 - (150 / (AC + 25))] ÷ [1 - (150 / (AC + 25))]
what is the interference if: distance between a and b is 10mu distance between b and c is 15mu observed double crossover rate is: 0.25%
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a very long straight wire carries current 32 a. in the middle of the wire a right-angle bend is made. the bend forms an arc of a circle of radius 14 cm, as show. determine the magnetic field at the center of the arc.
Therefore, the magnetic field at the center of the arc is 1.005 × 10^-5 T.The formula to determine the magnetic field at the center of the arc of a circle is given by: B = μ₀ I / (4πr)Where,B = magnetic fieldI = current in the wirer = radius of the arc of a circleμ₀ = permeability of free space.
Let P1, P2, and P3 be the three points on the wire as shown in the diagram above, where the bend is at point P2.
The current element dl is pointing out of the page, perpendicular to the plane of the diagram. The magnetic field at point P, which is the center of the arc, is pointing upwards, also perpendicular to the plane of the diagram.
Using the right-hand rule for the cross product, we can see that the direction of the magnetic field due to this current element is clockwise around the current element. Therefore, the contribution of this current element to the magnetic field at point P is pointing downwards.
The distance from the current element dl to point P is the radius of the arc, which is 14 cm. Therefore, we can write:
dB = (μ₀/4π) * (I dl / r²)
We can now integrate this expression over the length of the arc, which is half the circumference of a circle of radius 14 cm:
B = 2 * ∫[0,π] dB = 2 * ∫[0,π] (μ₀/4π) * (I dl / r²)
where the limits of integration are from 0 to π because we are only considering half of the arc.
Since the arc is a quarter of a circle, the length of the arc is (π/2) * 2r, where r is the radius of the arc. Therefore, we can write:
dl = (π/2) * 2r * dθ
where dθ is a small angle element. Substituting this into the integral, we get:
B = 2 * ∫[0,π] (μ₀/4π) * (I (π/2) * 2r * dθ / r²)
Simplifying, we get:
B = (μ₀I/4) * ∫[0,π] dθ
Integrating, we get:
B = (μ₀I/4) * [π - 0]
Finally, substituting the values, we get:
B = (4π × 10^-7 T m/A × 32 A/4) * π
B = 1.005 × 10^-5 T
Therefore, the magnetic field at the center of the arc is 1.005 × 10^-5 T.
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a rock of weight 500 n is at rest on the ground. the coefficient of static friction between the ground and the rock is 0.50. if someone pushes the rock with an applied force of 100 n to the right, what is the force of static friction between the ground and the rock?
The force of static friction between the ground and the rock is equal to the coefficient of static friction multiplied by the normal force. Since the rock is of weight 500 N, the normal force is 500 N. Therefore, the force of static friction is 500 N × 0.50 = 250 N.
The rock is at rest on the ground. The rock's weight is 500 N. The coefficient of static friction between the ground and the rock is 0.50. If somebody pushes the rock to the right with an applied force of 100 N.
In the present situation, we need to determine the force of static friction between the ground and the rock. The rock is not moving, and therefore the maximum static friction force is equal to the applied force of 100 N. To find the normal force (FN), we'll have to start with calculating the gravitational force acting on the rock.
The force of gravity is given as:
Fg = mg
where, m = mass of the object, g = acceleration due to gravity
The weight of the rock is given as 500 N. We can find the mass of the rock by dividing the weight by the acceleration due to gravity. Therefore,
m = Fg/g = 500 N / 9.81 m/s² = 50.9 kg
Now, we can compute the normal force (FN) exerted by the ground on the rock as:
FN = mg = 50.9 kg × 9.81 m/s² = 500 N
Therefore, FS ≤ μs FN= 0.50 × 500 N = 250 N
The maximum static friction force that can be exerted by the ground is 250 N. Therefore, the force of static friction between the ground and the rock is 100 N.
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why do nuclear reactors have three separate water loops instead of just a single one that runs from the water source, through the reactor, then back to the cooling tower?
Nuclear reactors have three separate water loops instead of just a single one that runs from the water source, through the reactor, then back to the cooling tower because the water running through the reactor is highly radioactive.
What are nuclear reactors?A nuclear reactor is a device that controls and maintains a sustained nuclear chain reaction for the purpose of generating heat or power, as well as the materials that make up a nuclear reactor.
The water running through the reactor is highly radioactive, which means that it cannot be released into the atmosphere or allowed to come into touch with humans or the environment. As a result, nuclear reactors are designed with three separate water loops.
The first loop circulates ordinary water that passes through the reactor and generates heat. The second loop, which is a separate circuit, brings this water to a steam turbine. The third loop, which is also a closed circuit, recovers the cooling water after it has passed through the turbine and transports it back to the reactor's inlet.In summary, nuclear reactors have three separate water loops instead of a single one that runs from the water source, through the reactor, and back to the cooling tower because the water running through the reactor is highly radioactive.
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The scale on the horizontal axis is 9 s per division and on the vertical axis 9 m per division
What is the time represented by the third tic mark on the horizontal axis
Answer in units of s
Each tic mark indicates a time period of 9 seconds if the scale on the horizontal axis has a division of 9 seconds. As a result, the third tic point on the horizontal axis would denote the following period of time:
3 x 9 s = 27 s
Hence, 27 seconds are indicated by the third tic point on the horizontal axis.
It is true! The third tic point would represent three times nine seconds, or 27 seconds, as each tic mark on the horizontal axis denotes a time interval of nine seconds.Each tic mark indicates a time period of 9 seconds if the scale on the horizontal axis has a division of 9 seconds. As a result, the third tic point on the horizontal axis would denote the following period of time:Hence, 27 seconds are indicated by the third tic point on the horizontal axis.
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a 35.0-g bullet moving at 475 m/s strikes a 4.4-kg bag of flour that is on ice, at rest. the bullet passes through the bag, leaving at 220 m/s. how fast is the bag moving when the bullet exits?
When the 35.0-g bullet moving at 475 m/s strikes the 4.4-kg bag of flour, the momentum of the bullet is transferred to the bag of flour, causing the bag of flour to move and the bag moving when the bullet exits at 91.3 m/s.
What is the speed of bag moving when the bullet exits?We can calculate the velocity of the bag of flour after the collision using conservation of momentum:
Here we have the following data as :
Momentum of bullet before collision = Momentum of bullet and bag after collision
m bullet × v bullet, before = (m bullet + m bag) bag × v bag, after
We can solve for v bag ,after:
v bag ,after = (m bullet × v bullet, before) / (m bullet + m bag)
v bag, after = (35.0 g × 475 m/s) / (35.0 g + 4.4 kg) = 91.3 m/s
Therefore, the bag of flour is moving at 91.3 m/s when the bullet exits.
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an open vertical tube has water in it. a tuning fork vibrates over its mouth. as the water level is lowered in the tube, the seventh resonance is heard when the water level is 217.75 cm below the top of the tube.
The speed of sound is found out to be 349.4 ms⁻¹ from the frequency of the seventh resonance heard when the water level is 217.75 cm below the top of the tube.
What is the frequency?Frequency of wave:
v = nλ
where, v = speed of sound, n = frequency, λ = wavelength
Speed of sound:
v = frequency n × wavelength λ
Frequency, n = v/λ
Wavelength, λ = v/n
The 7th resonance frequency of the tuning fork is given by:
n = 7 × f
where, f is the frequency of the tuning fork
Speed of sound, v = nλ
Speed of sound, v = 7fλ
Speed of sound, v = 7 × 256 Hz × λ
λ = 1.3671 m
Distance travelled by the sound wave in the water column is L = h + l
where, h = length of the air column and l = length of water column where the resonance was heard.
L = h + l
L = 217.75 cm + 50 cm
L = 267.75 cm = 2.6775 m
Length of the air column, h = L - l
where, l = length of water column where the resonance was heard.
h = 2.6775 m - 0.5 m
h = 2.1775 m
Wavelength of sound wave in air column, λ₁ = 4h
λ₁ = 4 × 2.1775 m
λ₁ = 8.71 m
Frequency of the sound wave in air column is given by:
n = v/λ₁
n = 349.4 ms⁻¹ / 8.71 m
n = 40.112 Hz
The 7th resonance frequency of the tuning fork is given by:
n = 7 × f
40.112 Hz = 7 × f
Frequency of the tuning fork, f = 5.73 Hz.
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You have a single 60-W bulb on in your room. How does the overall resistance of your room's electric circuit change when you turn on an additional 100-W bulb? Explain. Explain why an ideal ammeter would have zero resistance and an ideal voltmeter infinite resistance.
The overall resistance of your room's electric circuit will decrease when you turn on an additional 100-W bulb. An ideal ammeter would have zero resistance is because it is designed to measure current. An ideal voltmeter would have infinite resistance because it is designed to measure voltage.
When you turn on an additional 100-W bulb, the overall resistance of your room's electric circuit decreases because adding more bulbs increases the total current flowing through the circuit. The reason an ideal ammeter would have zero resistance is because it is designed to measure current, and any resistance in the ammeter itself would interfere with the measurement. An ideal voltmeter, on the other hand, would have infinite resistance because it is designed to measure voltage, and having a high resistance would prevent any current from flowing through the voltmeter and interfering with the measurement.
Both of these ideal instruments are hypothetical, but they help us understand the principles behind electrical measurements. For instance, a real ammeter has a small but measurable resistance, which means that some current is diverted from the circuit when it is connected, but this can be minimized by using a low-resistance shunt. Similarly, a real voltmeter has a high resistance, but not infinite, which means that some current will flow through it, but this can be minimized by using a high-resistance input circuit.
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A single constant force F = (3 i + 5 j) N acts on a 3.97 kg particle. (a) Calculate the work done by this force if the particle moves from the origin to the point having the vector position r = ( i - 2 j) m. (b) What is the speed of the particle at r if its speed at the origin is 4 m/s? (c) What is the change in the potential energy of the system?
(a) the work done by the force is -7 N.m
(b) the speed of the particle at r is 3.52 m/s
(c) Since the given force is not a conservative force, we cannot calculate the change in the potential energy of the system.
Work done by this force:
The work done by a force is calculated using the formula W = F.d, Where W is the work done, F is the force, and d is the displacement of the particle.Here, F = (3 i + 5 j) N, and d = r - 0 = ( i - 2 j) m - 0 i.e., d = (1 i - 2 j) m So,
W = F.d= (3 i + 5 j) N. (1 i - 2 j) m= 3 N.m - 10 N.m= -7 N.m
Therefore, the work done by the force is -7 N.m.
Speed of the particle at r:
Initial speed of the particle is given as 4 m/s. We need to calculate the final speed of the particle when it is at r. We can calculate the final speed using the work-energy principle which states that the work done by a force is equal to the change in kinetic energy of the particle.i.e., W = ΔKE. Total work done by the force is -7 N.m. Initial KE of the particle is 1/2 × 3.97 kg × (4 m/s)2 = 31.76 J.
Substituting the values in the above equation, we get
-7 = ΔKE - 31.76ΔKE = 24.76 J
Final KE of the particle is ΔKE = 1/2 × 3.97 kg × v2... (1)
Substituting the value of ΔKE in equation (1), we get
24.76 = 1/2 × 3.97 kg × v2v2 = 12.426 m2/s2v = 3.52 m/s
Therefore, the speed of the particle at r is 3.52 m/s.
Change in the potential energy of the system:
Potential energy of a system is defined as the work done by conservative forces to bring the particle from infinity to that position. Since the given force is not a conservative force, we cannot calculate the change in the potential energy of the system.
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Refer to Figure 22-15 to answer the following
questions.
a. What should the ammeter reading be?
b. What should the voltmeter reading be?
c. How much power is delivered to the resistor?
d. How much energy is delivered to the resistor
per hour?
a. The ammeter reading should be I = V/R = 27V/9ohm = 3A.
b. The voltmeter reading should be 27V, since it is connected in parallel with the battery and measures the voltage across it.
c. The power delivered to the resistor can be calculated using P = VI = (I^2)*R = (3A)^2 * 9ohm = 27W.
d. The energy delivered to the resistor per hour can be calculated using E = Pt = 27W * 1 hour = 27 Wh.
What is an ammeter?
An ammeter is a measuring instrument used to measure electric current flowing through a circuit. It is typically connected in series with the circuit so that all the current flowing in the circuit passes through the ammeter. Ammeters can be analog or digital, and they are designed to measure different ranges of current. They are an essential tool for diagnosing and troubleshooting electrical problems, and they are commonly used in industrial, commercial, and residential applications.
What is a voltmeter?
A voltmeter is a measuring instrument used to measure the electric potential difference (voltage) between two points in an electrical circuit. It is typically connected in parallel with the circuit component or circuit section whose voltage is to be measured. When a voltage is present in the circuit, the voltmeter displays the measured value in volts, which can help to determine the performance or condition of the circuit.
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a. The ammeter reading should be I = V/R = 27V/9ohm = 3A.
b. The voltmeter reading should be 27V, since it is connected in parallel with the battery and measures the voltage across it.
c. The power delivered to the resistor can be calculated using P = VI = (I^2)*R = (3A)^2 * 9ohm = 27W.
d. The energy delivered to the resistor per hour can be calculated using E = Pt = 27W * 1 hour = 27 Wh.
What is an ammeter?An ammeter is a measuring device used to determine the amount of electric current passing through a circuit. It is usually wired in series with the circuit so that all current passing through it goes through the ammeter. Ammeters can be analogue or digital, and they are used to detect various current levels. They are an indispensable instrument for diagnosing and troubleshooting electrical issues, and they are widely used in industrial, business, and domestic settings.
A voltmeter is a measuring device used to determine the difference in electric potential (voltage) between two locations in an electrical circuit. It is usually linked in parallel with the circuit component or portion whose voltage is to be measured. When a voltage is present in the circuit, the voltmeter shows the measured value in volts, which can aid in determining the circuit's performance or state.
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1. I’m in the 2nd column, 4th row, and I’m a metal. Who am I? ________________ 2. I’m a very lonely nonmetal. Who am I? ____________ 3. I’m the only metal who is a liquid at room temperature. Who am I? ____________ 4. I’m named after the person who created the 1st Periodic Table. Who am I? ___________ 5. I have 92 protons. Who am I? _____________ 6. I’m the only nonmetal who is a liquid at room temperature. Who am I? ___________ 7. I’m named after a very famous scientist. Who am I? ___________ 8. I have 46 electrons. Who am I? ____________ 9. My atomic mass is 183. 84. Who am I? _____________ 10. My chemical symbol is Ag. Who am I? ________________ 11. I’m the only metalloid in period 3. Who am I? ___________ 12. I’m the only element that is solid and a nonmetal in group 14. Who am I? _____________ 13. I have 5 neutrons. Who am I? ____________ 14. I’m the only gas at room temperature that is in group 16. Who am I? ___________ 15. I have 68 protons. Who am I? __________ 16. What element has the chemical symbol of Ir? ______________ 17. Which element is in group 7 and has 30 neutrons. Who am I? ___________ 18. I’m the only metal in group 15. Who am I? ____________ 19. I have 88 electrons. Who am I? ___________ 20. I’m the only gas at room temperature and in period 5. Who am I? ____________ 21. My symbol is Am. Who am I? ______________ 22. I’m the only nonmetal in period 6. Who am I? ____________ 23. My atomic number is 69. 723. Who am I? _________________ 24. I have 159 neutrons. Who am I? ________________ 25. I’m the only metalloid in group 17. Who am I? ______________ 26. I have 50 electrons. Who am I? __________________ 27. I’m in the 1st group and the 4th period. Who am I? ________________ 28. I’m a metalloid whose symbol is Sb. Who am I? ______________ ©JFlowers2017 Name: ______________________________ Date: ___________Class: ________ Periodic Table Scavenger Hunt Directions: You will use the Periodic Table to answer the questions. 1. I’m in the 17th column, a nonmetal, & a solid at room temperature. Who am I? ________________ 2. I have 79 electrons. Who am I? ____________ 3. I’m the only gas in period 6. Who am I? ____________ 4. My atomic mass is 257. Who am I? ___________ 5. My chemical symbol is Hs. Who am I? _____________ 6. I have 114 neutrons. Who am I? ___________ 7. I’m in the 18th group and 2 nd period. Who am I? ___________ 8. I have 67 protons. Who am I? ____________ 9. I’m a nonmetal who is solid at room temperature & has 2 letters for my symbol. Who am I? _________ 10. I’m in the 1 st group & 7 th period. Who am I? ________________ 11. I’m the only metalloid in group 13. Who am I? ___________ 12. I have 97 electrons. Who am I? _____________ 13. I am the only gas in column 15. Who am I? ____________ 14. My name is similar to Mickey Mouse’s best friend. Who am I? ___________ 15. I’m in group 11 & period 4. Who am I? __________ 16. I have 62 protons. Who am I? ______________ 17. My name fits really well with doctors because they try to do this. Who am I? ___________ 18. My name reminds me of where we all live. Who am I? ____________ 19. I’m the only nonmetal in period 2. Who am I? ___________ 20. My atomic number is 87. 62. Who am I? ____________ 21. My symbol is Mt. Who am I? ______________ 22. I’m in group 17 & the only metalloid. Who am I? ____________ 23. I have 71 electrons. Who am I? _________________ 24. My symbol is Pd. Who am I? ________________ 25. I’m Dorothy’s friend who needed a heart. Who am I? ______________ 26. I have 41 protons. Who am I? __________________ 27. I have 125 neutrons. Who am I? ________________ 28. My name comes from the 8th planet. Who am I? ______________
The Periodic Table of Elements served as the inspiration for this scavenger hunt. The exercise consists of two sets of questions, each of which has 28 questions that must be answered using the Periodic Table.
Students are tasked with identifying elements in the first set of questions using information from their attributes, such as the element's position on the periodic table, atomic mass, or quantity of electrons, protons, or neutrons. The objectives of the questions are to familiarise students with the properties of various elements and the structure of the Periodic Table. The second series of questions is comparable to the first, but more difficult because it asks students to identify components using less obvious cues, like their chemical symbol or a chemical formula. In order to succeed in their future studies of chemistry and other related sciences, students will benefit from being more familiar with the structure of the periodic table and the characteristics of various elements.
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A cyclist increases his speed from 10m/s to 20m/s. Calculate his average speed over this time interval
Answer: Lets say he is traveling that speed per 5 second.
Average Speed= Total Velocity/Time
(10+20)/5
30/5
6
Explanation:
A coaxial cable is a wire surrounded by a cylindrical conducting shell, with the wire at the center of the shell giving the system cylindrical symmetry. A current I is conducted along the wire in the +x direction. The same current is taken back to the source in the -x direction along the conducting shell, which has a radius R. (Hint: for the following questions, use Ampere's Law.)
a) What is the magnitude of the magnetic field within the coaxial cable between the wire and the shell; that is, in the region r
b) What is the magnitude of the magnetic field outside the coaxial cable, that is, in the region r>R?
The magnitude of the magnetic field within the coaxial cable between the wire and the shell; that is, in the region r is 0. This can be calculated through Ampere's law.
What is Ampere's law?The magnitude of the magnetic field between the wire and the shell (i.e. in the region r) can be calculated using Ampere's Law. This states that the integral of the magnetic field around any closed path is equal to the magnitude of the current passing through that path. Since the current I is flowing in the +x direction through the wire, and in the -x direction around the conducting shell, the total current passing through any path (r) in the radial direction will be 0.
Outside the coaxial cable (i.e. in the region r>R), the magnitude of the magnetic field can be calculated through Ampere's Law. Since the current I is flowing in the +x direction through the wire, and in the -x direction around the conducting shell, the total current passing through any path (r>R) in the radial direction will be I. Hence, the magnitude of the magnetic field in the region r>R is (μ/2π) × I/R, where μ is the permeability of free space.
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Light with wavelength equal to 105 nm falls on & metal surface. What is the minimum de Broglie wavelength of the photoelectrons emitted from this metal? Assume that the metal has & work function equal to 5.00 eV and use: h = 6.626 10-34 J.8 = 4.14 * 10-15 eV . 8; c = 3.00 x 108 m/s; mel = 9.11 x 10-31 kg; 1 eV 1.60 x 10-19 J.
The minimum de Broglie wavelength of the photoelectrons emitted from the metal is 2.19 x 10⁻⁹ m.
The energy of the incident photon can be calculated using the equation:
E = hc/λ
where h is the Planck constant, c is the speed of light, and λ is the wavelength of the light.
E = (6.626 x 10⁻³⁴J.s)(3.00 x 10⁸ m/s) / (105 x 10⁻⁹m)
E = 1.89 x 10⁻¹⁸ J
The work function of the metal is given as 5.00 eV, which can be converted to joules:
5.00 eV x 1.60 x 10⁻¹⁹ J/eV
= 8.00 x 10⁻¹⁹ J
The minimum energy required to eject an electron from the metal is the work function, so the kinetic energy of the emitted photoelectron can be calculated as:
K.E. = E - Work function
K.E. = 1.89 x 10⁻¹⁸ J - 8.00 x 10⁻¹⁹ J
K.E. = 1.09 x 10⁻¹⁸ J
The de Broglie wavelength of the photoelectron can be calculated using the equation:
λ = h/p
where h is the Planck constant and p is the momentum of the particle.
The momentum of the photoelectron can be calculated as:
p = √(2mK.E.)
where m is the mass of the electron.
p = √(2 x 9.11 x 10⁻³¹ kg x 1.09 x 10⁻¹⁸ J)
p = 3.03 x 10⁻²⁵ kg.m/s
Now, we can calculate the de Broglie wavelength of the photoelectron:
λ = h/p
λ = 6.626 x 10⁻³⁴ J.s / 3.03 x 10⁻²⁵ kg.m/s
λ = 2.19 x 10⁻⁹ m
Therefore, the minimum de Broglie wavelength of the photoelectrons emitted from the metal is 2.19 x 10⁻⁹ m.
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A man on a motorcycle plans to make a jump as shown in the figure. If he leaves the ramp with a speed of 33.0 m/s and has a speed of 31.5 m/s at the top of his trajectory, determine his maximum height (h) (inm) above the end of the ramp. Ignore friction and air resistance.
The maximum height (h) of the jump is 12.22 m above the end of the ramp.
The man on the motorcycle plans to make a jump with an initial speed of 33.0 m/s and a final speed of 31.5 m/s. The maximum height (h) of the jump can be calculated using the following equation:
h = (vi2 - vf2) / (2g)
where
Plugging in the given values, we get:
h = (33.02 - 31.52) / (2 x 9.81)
h = 12.22 m
Therefore, the maximum height (h) of the jump is 12.22 m above the end of the ramp.
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When tree is planted in an orchard, it is 78 cm tall Every year; the tree'$ height increases by 8% Which of the following formulas could be used t0 calculate the height of the tree years after planting? Note that when 0, the height of the tree is 78 cm 78(0.92"- 78( 1.08" 84.24(1.08" - 71.76(0.92"-' ) answcrsaved Previous Next press LEFT press RIGHT Reportfcrdback
When a tree is planted in an orchard, the tree's height increases by 8% every year. The height of the tree is 78 cm when it is planted.
The correct formula that can be used to calculate the height of the tree years after planting is:
[tex]h = 78(1.08)^t[/tex]
where "h" represents the height of the tree after "t" years of planting, and 1.08 is the growth factor that takes into account the 8 percent increase in height each year.
To use the formula, simply substitute the value of "t" with the number of years since planting, and then evaluate the expression to get the height of the tree in centimeters. For example, after 5 years, the height of the tree would be:
[tex]h = 78(1.08)^5[/tex]
h = 114.60 cm
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Why is this wrong? Can anybody please help me thanks!
Answer:
[tex]\boxed{5427N}[/tex]
Explanation:
We use the well-known equation:
[tex]F=m\cdot a[/tex]
where:
[tex]F=[/tex] Force (Newton)[tex]m=[/tex] mass [tex](kg)[/tex][tex]a=[/tex] acceleration (m/s^2)so, we can rewrite the equation like this:
[tex]F= (810kg)(6.7m/s^2)\\F=5427N[/tex]
So, taking into account the statement as seen in the image, your answer must be correct.
[tex]\text{-B$\mathfrak{randon}$VN}[/tex]
Consider a moon that orbits one of our most distant planets in an elliptical path. The distance that the
moon covers each day is
A) greatest when the moon is closest to the planet.
B) greatest when the moon is furthest from the planet.
C) the same regardless of its distance from the sun.
D) the same regardless of its distance from the planet
Consider a moon that orbits one of our most distant planets in an elliptical path. The distance that the moon covers each day is greatest when the moon is closest to the planet. The correct answer is Option A.
An elliptical path is a path that isn't a circle. Rather, it is formed like an oval. So, consider a moon that orbits one of our most distant planets in an elliptical path, the distance that the moon covers each day is greatest when the moon is closest to the planet.
This is due to the fact that the gravity of the planet (which is constantly acting upon the moon) is strongest when the moon is closest to the planet, and gravity influences an object's movement. As a result, when the moon is closest to the planet, it has the greatest acceleration and, as a result, the greatest velocity (speed). This is why, when the moon is closest to the planet, it covers the most distance each day.
In addition, when the moon is closest to the planet, it has a tighter turn radius (the distance between its path and the planet's center). As a result, when the moon is closest to the planet, it is travelling quicker than when it is further away.
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focusing a camera changes the distance between the lens and the film. does the eye focus by changing the distance between the lens and the retina? explain your answer.
Focusing a camera changes the distance between the lens and the film. And the eye focus by changing the distance between the lens and the retina is true as, the eye does focus by changing the distance between the lens and the retina.
What is the effect of changing the distance?When we focus on an object, the curvature of the lens in our eye changes. This causes the light rays from the object to converge and focus on the retina, located at the back of the eye.
In order to focus on objects at different distances, our eye's lens must adjust its shape by changing its curvature, which changes the distance between the lens and the retina. This process is called accommodation.
The process of focusing the eye is similar to the process of focusing a camera. In a camera, changing the distance between the lens and the film allows for the object to be in focus. Similarly, in the eye, changing the distance between the lens and the retina allows for objects to be in focus.
Therefore, the eye focuses by changing the distance between the lens and the retina.
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F_1=20kN
Determine the x and y components of reaction at pin A and pin D using scalar notation.
Given,F1 = 20 kN Reaction at Pin A is represented as FAB, and the reaction at Pin D is represented as FDC. Let the angle between AB and the horizontal be θ.
Let the angle between CD and the horizontal be φ.Resolution of Force F1:Let the x-component of the reaction at Pin A be FABx and the y-component be FABy. Thus, from the force balance equation, we get,∑F_x = FABx + FDCx = 0⇒ FABx = -FDCxAlso, ∑F_y = FABy + FDCy = F1 = 20kNAs the beam is in equilibrium,∑M_{D} = FABy . AD - FDCy . DC = 0This is the moment balance equation of the beam. We can solve for either FAB or FDC using these two equations, as the magnitude of the forces will be the same.Resolution of forces at Pin A:For forces at Pin A, we use scalar notation.∑F_x = F_{ABx} = 0As there is no external force in the x direction, FABx is 0.∑F_y = F_{ABy} - F1 = 0Hence, the y-component of the reaction at Pin A is FABy = F1 = 20kN.Resolution of forces at Pin D:For forces at Pin D, we use scalar notation.∑F_x = F_{DCx} = 0As there is no external force in the x direction, FDCx is 0.∑F_y = F_{DCy} - F1 = 0Hence, the y-component of the reaction at Pin D is FDCy = F1 = 20kN.Thus, the x-component of the reaction at Pin A and Pin D is 0, and the y-component of the reaction at Pin A and Pin D is 20 kN.
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a 12 kg object is attached to a cord that is wrapped around a wheel of radius 10 cm. the object accelerates down the frictionless 37 degree incline at 2 m/s^2. find the tension in the cord and the moment of inertia of the wheel.
a.) The tension in the rope that is wrapped around a wheel of radius 10 cm and a 12 kg object is attached = 46 N.
b.) The moment of inertia of the wheel = 2.3 kg m².
c.) The angular speed of the wheel 2.00 s after it begins rotating, starting from rest = 40 rad/s.
How to determine the tension in the rope?Use the equation:
T = Fsinθ - ma
Mass of object = 12 kg
Radius of wheel = 10 cm
Acceleration of object down the incline = 2 m/s²
The incline is frictionless
(a) The tension in the rope:
The force acting on the object is its weight, which is given as,
F = mg = 12 x 9.8
= 117.6 N
Along the incline, the component of F acting downward is given as,
Fsinθ = 117.6sin37°
= 70 N
This force provides the object with a net acceleration along the incline.
Fsinθ - T = ma => T = Fsinθ - ma = 70 - 12 x 2
= 46 N
Therefore, the tension in the rope is 46 N.
(b) The moment of inertia of the wheel
The net torque acting on the wheel is given by,
T = Iα
Where
I is the moment of inertia of the wheel, and
α is the angular acceleration of the wheel.
We know that,α = a / r
Where
a is the linear acceleration of the object and
r is the radius of the wheel.
Hence,
α = 2 / 0.1 = 20 rad/s²
T = Iα => I = T / α = 46 / 20
= 2.3 kg m²
Therefore, the moment of inertia of the wheel is 2.3 kg m².
(c) The angular speed of the wheel 2.00 s after it begins rotating, starting from rest.
The angular acceleration of the wheel is given as,
α = a / r = 2 / 0.1
= 20 rad/s²
ω = αt
Where
t is the time period for which the wheel has rotated.
ω = αt
= 20 x 2
= 40 rad/s
Therefore, the angular speed of the wheel after 2.00 s is 40 rad/s.
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What is an atom? Who were some of the scientists involved in discovering the atom? What particles are atoms composed of?
Answer:
An atom is the smallest unit of matter that retains the chemical properties of an element. Atoms are composed of a central nucleus, which contains protons and neutrons, surrounded by a cloud of negatively charged electrons.
The idea of the atom has been around for centuries, but it was not until the late 19th and early 20th centuries that scientists began to understand its structure. Some of the scientists involved in the discovery of the atom include:
John Dalton (1766-1844) - Dalton proposed the atomic theory, which stated that all matter is composed of small, indivisible particles called atoms.
J.J. Thomson (1856-1940) - Thomson discovered the electron and proposed the "plum pudding" model of the atom, in which electrons are embedded in a positively charged sphere.
Ernest Rutherford (1871-1937) - Rutherford conducted the gold foil experiment, which led to the discovery of the nucleus and the proposal of the nuclear model of the atom.
Niels Bohr (1885-1962) - Bohr proposed the planetary model of the atom, in which electrons orbit the nucleus in discrete energy levels.
The particles that atoms are composed of are protons, neutrons, and electrons. Protons have a positive charge and are located in the nucleus, while neutrons have no charge and are also located in the nucleus. Electrons have a negative charge and orbit the nucleus in shells or energy levels.
Explanation:
ABOVE
a person of mass 75.0 kg is initially at rest on the edge of a large stationary platform of mass 155 kg, supported by frictionless wheels on a horizontal surface. the person jumps off the platform, traveling a horizontal distance of 1.00 m while falling a vertical distance of 0.500 m to the ground. what is the final speed of the platform?
When the person jumps off the platform, traveling a horizontal distance of 1.00 m while falling a vertical distance of 0.500 m to the ground, the final speed of the platform is: 0.602 m/s
The momentum of the person right before he jumps off is given by [tex]P = m*v = 75 kg * 0 m/s = 0 Ns.[/tex]
After he jumps off, the momentum of the platform-person system must remain the same: P = m*v. So, the final velocity of the platform after the person jumps off is given by v = P/m.
Now, we just need to calculate the new momentum of the system after the person jumps off. For that, we can use the conservation of energy, which states that the total energy in a closed system remains constant:
Potential energy before = Potential energy after + Kinetic energy after mgh
[tex]= (1/2)mv^2 + (1/2)Mv^2[/tex]
where m is the mass of the person (75.0 kg), M is the mass of the platform (155 kg), h is the height (0.500 m), and v is the velocity of the platform after the person jumps off.
Solving this equation for v, we get:
[tex]v = sqrt(2gh/(m+M))[/tex]
[tex]v = sqrt(2*9.81*0.500/(75.0+155)) = 0.602 m/s[/tex]
Therefore, the final speed of the platform is 0.602 m/s.
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what genetically programmed, innate pattern of response that is specific to members of a particular species?
A species-specific, genetically programmed pattern of behavior is known as an instinct. It includes activities like migration, hunting, and grooming and is essential for an animal's survival; it is not learned but inherited.
A species-specific reaction pattern that is intrinsic and genetically encoded is known as an instinct. It is an activity or habit that is present from birth or hatching and is not learned but rather inherited. An animal's ability to reproduce and survive depends on these instincts. Depending on the species, instincts may involve activities including migration, nest-building, hunting, and grooming. Animals may compete for resources and adapt to their environments thanks to these behaviors, which are frequently complicated and quite particular. Natural selection is assumed to have led to the evolution of instincts, with creatures with advantageous instincts having a higher chance of surviving and passing on their genes to subsequent generations.
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in addition to hundreds of smaller objects they have been discovering in the kuiper belt recently, astronomers were surprised to find
In addition to hundreds of smaller objects they have been discovering in the Kuiper Belt recently, astronomers were surprised to find dwarf planet Eris.
The first object that was bigger than Pluto was Eris. The initial estimate of Eris' size was 1,240 miles (2,000 kilometers) in diameter. It was later discovered to be a bit smaller, with a diameter of 1,163 miles (1,864 kilometers). Its moon, Dysnomia, was also discovered.Eris' orbit is far more eccentric than Pluto's, ranging from 38 to 97 astronomical units (AU) from the Sun.
Eris takes 557 Earth years to orbit the Sun. Despite the fact that Pluto's path also varies in shape, it is always closer to the Sun than Eris. Pluto and Eris were both discovered in the early 21st century, in 1930 and 2005, respectively. Because it was the largest known body in the Kuiper Belt, Pluto was formerly classified as the Solar System's ninth planet. Following the discovery of Eris and other trans-Neptunian objects, Pluto was reclassified as a dwarf planet.
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an electron is accelerated through 1.65 103 v from rest and then enters a uniform 2.80-t magnetic field. (a) what is the maximum magnitude of the magnetic force this particle can experience?
This means that the maximum magnitude of the magnetic force the electron can experience in this situation is 6.17 x 10-14 N.
The maximum magnitude of the magnetic force that an electron can experience when accelerated through 1.65 103 V from rest and entering a uniform 2.80-T magnetic field can be calculated using the equation F=q(v X B), where F is the force, q is the charge of the electron, v is its velocity, and B is the magnetic field.
Using the equation above, we can calculate the maximum magnitude of the magnetic force as F=1.6 x 10-19C(1.65 x 103 m/s x 2.8T)=6.17 x 10-14 N.
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A student placed a stuffed animal on the dashboard of a car. When the car accelerated quickly, the stuffed animal flew back onto the seat. Which principle BEST describes the motion of the stuffed animal as the car accelerated.inertiaspeedmomentumgravity
The principle that best describes the motion of the stuffed animal as the car accelerated is inertia.
Inertia is a property of matter that describes the resistance of an object to changes in its state of motion. An object will stay at rest or continue moving in a straight line at a constant speed if no external force acts upon it. This property of matter is referred to as inertia.
The stuffed animal in the scenario experienced the effects of inertia. The stuffed animal was at rest on the dashboard, and when the car accelerated quickly, the stuffed animal had a tendency to remain at rest due to its inertia. This resistance to a change in motion led to the stuffed animal being propelled backward and off the dashboard and onto the seat.
The principle that best describes the motion of the stuffed animal as the car accelerated is inertia. The stuffed animal had a tendency to remain at rest due to its inertia. This resistance to a change in motion led to the stuffed animal being propelled backward and off the dashboard and onto the seat.
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