What technological improvement in the 1920s allowed more goods to be produced at one time?
Automobile
Assembly line
Telephone
Motion picture
Answer: Telephone
Explanation:
The technological improvement that allowed more goods to be produced at one time in the 1920s was the development and widespread use of assembly line production. This was pioneered by companies such as Ford Motor Company, which introduced the assembly line to its automobile factories. The assembly line method allowed for the mass production of standardized products using specialized machines and workers performing specific tasks. By breaking down the manufacturing process into smaller, simpler tasks, and optimizing the movement of workers and materials, the assembly line significantly increased production efficiency and output. This led to the growth of mass production industries, increased affordability of goods, and a significant shift in the nature of work in the 20th century.
A block of weight w = 25.0 N sits on a frictionless inclined plane, which makes an angle 8 = 29.0° with respect to the horizontal, as shown in the figure. (Figure 1) A force of magnitude F = 12.1 N, applied parallel to the incline, is just sufficient to pull the block up the plane at constant speed.
Part B: What is We, the work done on the block by the force of gravity was the block moves a distance L = 3.40 m up the incline?
Part C. What is Wf the work done on the block by the applied force F as the block moves a distance L = 3.40 mm up the incline? Express your answer in Joules
a) The net Work done is zero. b) The work done on the block by the applied force F as the block moves a distance L is -41.2 J. c) The work done on the block by the applied force F as the block moves a distance L is 41.2 J.
Given:
Weight of the block (w) = 25.0 N
Distance moved by the block (d) = 3.40 m
The angle of the inclined plane (θ) = 29.0°
a) we know that from the work-energy theorem,
W = change in kinetic energy
But since speed is constant which means no change in KE, hence the net Work done is zero.
b) W = -mgy
W = -25 × (3.10 × sin29°)
W = -41.2 J
Therefore, the work done on the block by the force of gravity is -41.2 J.
c) The work done on the block by the applied force F as the block moves a distance L = 3.10m up the incline is,
W = Fd
W = 12.1 × 3.1
W = 41.2 J
Therefore, the work done on the block by the applied force F as the block moves a distance L is 41.2 J.
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suppose your planet at 1 meter from the basketball represents a distance of 4 x 107 km (-0.3 al) from the star. the next closest star to the sun is 4 x 1013 km away. how far away from the model star/planet would you have to be for the distances in the system to be to scale? express your answer in meters and kilometers.
Answer: The model star/planet would have to be 1,000 km away from the next closest star.
Explanation:
We need to find out the distance required for the distances in the system to be in scale.
Let's use the proportion to solve the problem:
1 m/4 × 10⁷ km = x/4 × 10¹³ km
Where x is the distance required for the distances in the system to be in scale.
Cross-multiply: 4 × 10¹³ km × 1 m = 4 × 10⁷ km × x
Simplify: 4 × 10¹³ m = 4 × 10⁷ x
Divide both sides by 4 × 10⁷ :1 × 10⁶ = x
Therefore, the distance required for the distances in the system to be in scale is 1 × 10⁶ m or 1,000 km.
So the model star/planet would have to be 1,000 km away from the next closest star.
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explain why hydrogen is not a dominant component of the atmospheres of the terrestrial planets, even though it is the most common element in the universe and in the solar system.
Hydrogen is not a dominant component of the atmospheres of the terrestrial planets, even though it is the most common element in the universe and solar system because it is a volatile and low molecular weight element.
What is Hydrogen?Hydrogen element is not a dominant component of the atmospheres of the terrestrial planets, even though it is one of the most common element in the universe and in the solar system as well because the planets were formed through the accretion.
Accretion is the process by which the small particles combine into progressively larger bodies which become planets. As a result of this, the process left behind the lighter gas elements such as hydrogen and helium. The gas molecules of hydrogen atom are lighter than the rest of the chemical elements, therefore the gravity of the terrestrial planets is not sufficient to hold them. As a result, hydrogen escapes from the planet's atmosphere, leaving behind the heavier elements like carbon dioxide, nitrogen, and oxygen in their atmospheres.
Therefore, although hydrogen is the most common element in the universe and in the solar system, it is not a major constituent of the terrestrial planets.
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now consider the case of impending tipping. where do the normal force and friction force act in this case? a. at the midpoint of the bottom edge of the block. b. at the point directly below the center of gravity of the block. c. at the edge of the block closest to the top of the ramp. d. at the edge of the block closest to the bottom of the ramp. e. at an unknown point along the bottom edge of the block.
The normal force and friction force act at the point directly below the center of gravity of the block in the case of impending tipping.
Impending tipping occurs when the force of gravity acting on an object is unbalanced, causing it to start to tip over or become unstable.
When a solid object is about to tip over, the net torque about its center of gravity should be zero, or else it will fall.
In the case of impending tipping, the normal force and friction force act at the point directly below the center of gravity of the block.
When an object is about to tip over, the normal force (or the weight) acting on the center of mass should be equal to the maximum possible friction force at the base of the object.
Normally, a force is applied to the object that exceeds this friction force, causing the object to tip over.
When an object is about to tip over, the normal force (or the weight) acting on the center of mass should be equal to the maximum possible friction force at the base of the object.
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Q9: A bungee jumper falls with a total of 7.8kJ of kinetic energy. If the bungee jumper's total mass is 50kg, at what speed do they fall?
The bungee jumper falls at a speed of approximately 17.67 meters per second.
What is the bungee jumper fall speed?Kinetic energy is simply a form of energy a particle or object possesses due to its motion.
It is expressed as;
K = (1/2)mv²
Where m is mass of the object and v is its velocity.
We know that the kinetic energy of the bungee jumper is 7.8 kJ and their mass is 50 kg.
Substituting these values into the equation gives:
K = (1/2)mv²
7.8 kJ = (1/2) × 50 kg × v²
Convert from kiloJoule to Joule
7.8 kJ = (7.8 × 1000 ) = 7800J
Simplifying:
7800J = (1/2) × 50 kg × v²
7800 kgm²/s² = (1/2) × 50 kg × v²
7800 kgm²/s² = 25 kg × v²
v² = 7800 kgm²/s² ÷ 25kg
v² = 312 m²/s²
Taking the square root of both sides:
v = √( 312 m²/s² )
v = 17.67 m/s
Therefore, the fall speed is 17.67 m/s.
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An automatic saw has several forces acting on it. In a Cartesian system, a position-dependent force applied to the saw is =-kxy2j, with k = 2.50 N m³. Let's consider the displacement of the saw from the origin to point C (4.0 m, 4.0 m). Calculate the work done on the saw by if the displacement is along the straight-line y = x that connects these two points.
The work done on the saw by the force if the displacement is along the straight-line y = x that connects these two points is -640.0 J.
How to calculate work done?To calculate the work done on the saw by the force as it moves along the straight-line y = x that connects the two points, we need to first find the displacement vector and then use it to calculate the work done.
The displacement vector from the origin to point C is given by:
r = (4.0 m) i + (4.0 m) j
The force acting on the saw is given by:
F = -kxy² j = -2.50 (N m³) (x) (y²) j
Since it is moving along the straight-line y = x, we can substitute x = y into the expression for F:
F = -2.50 (N m³) (x) (y²) j = -2.50 (N m³) (y³) j
Substituting x = y = 4.0 m:
F = -2.50 (N m³) (4.0 m)³ j = -160.0 j N
The work done by the force is given by the dot product of the force and displacement vectors:
W = F · r = (-160.0 N j) · (4.0 m i + 4.0 m j)
W = (-160.0 N) (4.0 m cos(45°))
W = -640.0 J
Therefore, the work done on the saw by the force as it moves along the straight-line y = x that connects the two points is -640.0 J.
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the us bank tower in los angeles is designed to resist an earthquake of what magnitude on the richter scale?
The 8.3 on the Richter scale earthquake magnitude can be withstood by the US Bank Tower in Los Angeles.
How earthquake-proof is the Los Angeles U.S. Bank Tower?A frame that is strengthened in two directions is part of the central core structure. Two struts, each one level high, are employed to decrease horizontal stresses brought on by wind or earthquakes beginning at the 53rd floor.
A 9.0 earthquake can a tower withstand?Indeed, it is the answer. Modern structural design techniques can be used to construct skyscrapers that can resist earthquakes. Performance-based structural design (PBSD), a cutting-edge design methodology for creating earthquake-resistant structures, is one of them.
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how many types of classifications are there for a lunar eclipse?
There are three types of lunar eclipses: total, partial, and penumbral.
During a total lunar eclipse, the moon is completely shadowed by the Earth, resulting in a reddish-brown color. In a partial lunar eclipse, only a portion of the moon is shadowed, while in a penumbral lunar eclipse, the moon passes through the Earth's outer shadow, resulting in a subtle darkening of the moon's surface. These classifications are based on the degree to which the moon passes through the Earth's shadow during the eclipse.
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Consult Multiple-Concept Example 10 in preparation for this problem. Traveling at a speed of 16.1 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.720. What is the speed of the automobile after 1.30s have elapsed? Ignore the effects of air resistance.
The speed of the automobile after 1.30 seconds have elapsed is 15.164 m/s.
Given the following data,
we will have to calculate the velocity of the car after 1.30 seconds:
Initial velocity, u = 16.1 m/s
Final velocity, v =?
Time elapsed, t = 1.30s
Coefficient of kinetic friction, μk = 0.720
We will apply the law of motion, i.e., v = u - μkt
Where, v is the final velocity of the car after 1.30 seconds,
u is the initial velocity of the car,
μk is the coefficient of kinetic friction,
t is the time elapsed after 1.30 seconds
Given values,
u = 16.1 m/sμk = 0.720t = 1.30s
Substituting the given values in the equation,
we get v = 16.1 m/s - (0.720 x 1.30s)
v = 16.1 m/s - 0.936v = 15.164 m/s
Therefore, the speed of the automobile after 1.30 seconds have elapsed is 15.164 m/s.
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Without doing a calculation, predict which of these compounds has the greatest molar solubility in water . A) AgBr (Ksp = 5.0x10-13)
B) Agl (Ksp = 8.3x10-17)
C) AgCl (Ksp = 1.8x10-10)
Without doing a calculation, the compound that has the greatest molar solubility in water among the given compounds is AgCl.
The reason for this is because it has the largest Ksp value among the given options. Ksp, or the solubility product constant, is the equilibrium constant for the dissolution of a sparingly soluble compound in a solution. It represents the maximum amount of solute that may be dissolved in a solvent at equilibrium under given conditions.AgBr, AgI, and AgCl are all sparingly soluble in water.
They all have small solubility product constants, indicating that they dissolve very little in water at equilibrium. AgCl has the greatest molar solubility among the three options, according to the given Ksp values. Its solubility product constant is 1.8 x 10-10, which is much greater than those of AgBr and AgI. Therefore, AgCl is the compound with the greatest molar solubility in water without any calculation.In summary, among the given options, AgCl has the greatest molar solubility in water without any calculation.
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19. Which statement correctly describes a short circuit?
O A. Having a part with very low resistance keeps the circuit cooler, preventing
damage caused by overheating.
O B. Almost no current flows through a part of a circuit that has very low resistance
because it goes through the load.
OC. Almost all the current flows through a part of a parallel circuit with very low
resistance, instead of through the rest of the circuit.
O D. Having a part with very low resistance keeps circuit breakers and fuses from
opening the circuit
oc, it's the closest definition to a short circuit
Answer: almost all the current flows through a part of a parallel circuit, with very low resistance, instead of through the rest of the circuit.
Explanation:
A typical value for the dielectric constant of rubber is a minimum of 2. Give one reason why your experimental value was less than two!
What are the dependent and independent variables in thid experiment?
The independent variable in this experiment is the dielectric constant of rubber, and the dependent variable is the measured value. The typical value for the dielectric constant of rubber is a minimum of 2, but your experimental value could have been lower than two.
The dependent and independent variables in this experiment are not specified. Therefore, it is impossible to answer the question accurately. A typical value for the dielectric constant of rubber is a minimum of 2.
The dielectric constant is defined as the ratio of the electric flux density produced in a substance to that produced in a vacuum by the same electric field.
The dielectric constant is a measure of a substance's ability to store charge in an electric field. The dielectric constant of a substance indicates how easily it can be polarized in response to an applied electric field.
It varies with temperature, frequency, and pressure, among other factors.
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When current flows through a conductor, it develops a magnetic field of concentric circles expanding ? and outward from the conductor. a. circularly b. parallel c. perpendicular d. wavy
When a current travels through a conductor in a circular motion, a magnetic field with growing concentric circles is created.
What happens when current flows through a conductor?Electromagnetism is established when an electrical current flows through a simple conductor, such as a length of wire or cable.
What magnetic field is created when current travels through a conductor?As magnetic fields produced by moving charges are proportional to the current, a conductor carrying current creates a magnetic field around it. Generally speaking, the sub-atomic particles in the conductor, such as the moving electrons in the atomic orbitals, are responsible for this magnetic field.
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a 3 3-inch candle burns down in 12 hours. if b represents how much of the candle, in inches, has burned away at any time given in hours, t, write a proportional equation for b in terms of t that matches the context.
The proportional equation that matches the context of a 33-inch candle burning down in 12 hours is b = 2.75t.
A candle that is 33 inches long is called a 33-inch candle. Candles are a popular decorative item that is commonly used for lighting, as decoration for weddings, and parties, or to create an aromatic atmosphere. B represents the length of the candle that has burned away at any time given in hours, t.
To find the proportional equation for b in terms of t that matches the context of a 33-inch candle burning down in 12 hours, the following steps should be followed:
Identify the given informationThe length of the candle (l) = 33 inchesThe time taken for the candle to burn down (t) = 12 hours
Determine the rate of burning The rate of burning of the candle is given by l/t. Therefore, the rate of burning = 33/12 = 2.75 inches per hour.
The proportional equation for b in terms of t is given by b = rt where r is the rate of burning. Therefore, b = 2.75t.
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A car travelling at 22.4 m/s skids to a stop in 2.55s. Determine the skidding distance of the car (assume uniform acceleration).
Answer:
Approximately [tex]28.6\; {\rm m}[/tex].
Explanation:
Let [tex]u[/tex] denote the initial velocity of the vehicle, and let [tex]v[/tex] denote the velocity of the vehicle after skidding. It is given that the initial velocity was [tex]u = 22.4\; {\rm m\cdot s^{-1}}[/tex]. Since the vehicle skidded to a stop, [tex]v = 0\; {\rm m\cdot s^{-1}}[/tex].
Let [tex]t[/tex] denote the duration of the skid. It is given that [tex]t = 2.55\; {\rm s}[/tex].
Under the assumption that acceleration is constant, SUVAT equations will apply.
Specifically, the SUVAT equation [tex]x &= (1/2)\, (u + v)\, t[/tex] will be satisfied. In this equation, the displacement of the vehicle is equal to average velocity times duration. This equation allows the displacement [tex]x[/tex] to be found from [tex]u[/tex], [tex]v[/tex], and [tex]t[/tex] without knowing the exact value of acceleration:
[tex]\begin{aligned}x &= \left(\frac{u + v}{2}\right)\, t \\ &= \left(\frac{22.4 + 0}{2}\; {\rm m\cdot s^{-1}}\right)\; (2.55\; {\rm s}) \\ &\approx 28.6\; {\rm m}\end{aligned}[/tex].
The control surface of an aircraft is supported by a thrust bearing at point C and isactuated by a bar connected to point A. The 1 kN force acts in the negative z direction,and the line connecting points A and B is parallel to the z axis. Determine the value offorce F needed for equilibrium and all support reactions.
It takes 1.414 kN of force F to achieve equilibrium and all supporting processes.
What is Force?An external force is an agent that has the power to alter the resting or moving condition of a body. It has a trajectory and a magnitude. The application of force is the place at which force is applied, and the direction in which the force is applied is known as the direction of the force.
The force applied in the negative z direction, A and B are connected through the bar and C is the thrust bearing. Determine the value of force F needed for equilibrium and all support reactions.
Steps to find the value of force F required for equilibrium and all support reactions:
Firstly, the control surface of an aircraft is supported by a thrust bearing at point C and is actuated by a bar connected to point A. The 1 kN force acts in the negative z direction and the line connecting points A and B is parallel to the z-axis. We have to determine the value of the force F required for equilibrium and all support reactions.
There are three supports; at A, B, and C. Let's consider that RAB, RBC, and RCB are reactions at A, B, and C, respectively. There are two directions, one is positive and the other is negative.
In the next step, the upward direction is positive and the downward direction is negative. Sum of forces in the x-direction:F cosθ = 0 ⇒ F = 0. Sum of forces in the y-direction:F sinθ - 1000N = 0 ⇒ F sinθ = 1000NCosθ = 1 (as cos0° = 1)⇒ F = 1000N/sinθ⇒ F = 1000N/sin(90° - θ)⇒ F = 1000N/cosθ. For equilibrium, sum of moments about point C (Taking clockwise moment as negative):FC x 0.5 - RAB x 0.5 - RCB x 1 = 0RAB + RCB = FC.
Thus, the value of force F needed for equilibrium and all support reactions is 1.414 kN.
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A cylindrical pulley with a mass of 7.7 kg, radius of 0.532 m and moment of inertia 1/2 M r^2 is used to lower a bucket with a mass of 2.4 kg into a well. The bucket starts from rest and falls for 4.5 s. a) What is the linear acceleration of the falling bucket? The acceleration of gravity is 9.8 m/s^2. Answer in units of m/s^2. b) How far does it drop? Answer in units of m. c) Find the angular acceleration of the cylinder. Answer in units of rad/s22.
The linear acceleration of the falling bucket can be calculated using the formula.
a = g - (T/M)
where g is the acceleration of gravity (9.8 m/s²), T is the torque exerted by the pulley (T = Iα, where I is the moment of inertia, and α is the angular acceleration), and M is the mass of the bucket. We can calculate the torque of the pulley by substituting the given values:
T = (1/2 M r²) * (α)
T = (1/2) * (7.7 kg) * (0.532 m)² * (α)
T = 2.01 (kg m²) * (α).
Therefore,
a = 9.8 m/s² - (2.01 (kg m^2) * (α) /2.4 kg)
a = 9.58 m/s²
The distance traveled by the bucket can be calculated using the formula
d = (1/2) * a * t²
where a is the acceleration of the bucket (9.58 m/s²) and t is the time it takes to fall (4.5 s).
Therefore,
d = (1/2) * (9.58 m/s²) * (4.5 s)²
d = 98.2 m
The angular acceleration of the cylinder can be calculated using the formula
α = T/I
where T is the torque exerted by the pulley (2.01 (kg m²) * (α)) and I is the moment of inertia (1/2 M r²).
Therefore,
α = 2.01 (kg m²) * (α) / (1/2) * (7.7 kg) * (0.532 m)²
α = 10.3 rad/s²
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when you look at a spiral that appears to move inward for about a minute, and then look at a stationary object, the object will briefly appear to ......
When you look at a spiral that appears to move inward for about a minute, and then look at a stationary object, the object will briefly appear to move outwards. This phenomenon is known as the motion aftereffect (MAE).
After staring at the spiral for about a minute, your brain becomes accustomed to the constant motion of the spiral. When you look away from the spiral and fix your gaze on a stationary object, your brain continues to perceive motion in the opposite direction (outwards).
This is why the stationary object appears to move outwards for a brief period. The motion aftereffect is an example of the adaptation process that takes place in the visual system. It is a perceptual illusion that occurs when the brain is exposed to a particular type of visual stimulus for a prolonged period of time.
Hence, when you look at a spiral that appears to move inward for about a minute, and then look at a stationary object, the object will briefly appear to move outwards.
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Gas G1 G2 G3 G4 2am/mol2) L/mol) 0.0289 0.0388 0.0467 0.0310 2 5.22 1.05 2.31 4.05 Based on the given van der Waals constants for four hypothetical gases (G1, G2, G3, G4), arrange these hypothetical gases in order of decreasing strength of intermolecular forces. Assume that the gases have similar molar masses.
Rank from strongest to weakest intermolecular attraction. To rank items as equivalent, overlap them.
Gas 3, Gas 2, Gas 1, Gas 4
According to the strength of the intermolecular forces, the hypothetical gases can be ordered as follows: Gas 3 > Gas 2 > Gas 1 > Gas 4.
The strength of intermolecular forces in gases can be estimated by analyzing their van der Waals constants, which take into account the size and polarizability of the molecules. A higher value of the van der Waals constant indicates stronger intermolecular forces.
Based on the given van der Waals constants, we can rank the hypothetical gases in order of decreasing strength of intermolecular forces as follows:
Gas 3 > Gas 2 > Gas 1 > Gas 4
Gas 3 has the highest van der Waals constant (a = 2.31 L/mol), indicating the strongest intermolecular forces, while Gas 4 has the lowest van der Waals constant (a = 4.05 L/mol), indicating the weakest intermolecular forces. Gas 2 and Gas 1 have intermediate values of van der Waals constants, with Gas 2 having a higher value than Gas 1, indicating stronger intermolecular forces.
Therefore, the hypothetical gases can be ranked in order of decreasing strength of intermolecular forces as Gas 3 > Gas 2 > Gas 1 > Gas 4.
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A__ is a measure of the electric power an appliance uses
An appliance's use of electricity is measured in watt (W). It displays the rate at which an electrical device uses energy while it is in operation. The power needed to generate one joule of energy per second is equal to one watt.
WattAn electrical device uses energy from the electrical power source that powers it when it is in use. Watts (W), a unit of power, is used to assess the rate of energy consumption. The pace at which one joule of energy is used up per second is equal to one watt.A 60-watt light bulb, for instance, means that when it is turned on, it uses energy at a rate of 60 joules per second. Similarly to this, when a fan with a 100-watt rating is switched on, it uses 100 joules of energy each second.An appliance's wattage can be found on its label or in its user manual.learn more about watt here
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Car A (traveling north at 70 mph) and car B (traveling west at 50 mph) are heading toward the same intersection. Car A is 5 miles from the intersection while car B is 6 miles from the intersection. Find parametric equations that describe the motion of cars A and B.
A) Car A: x = 0, y = 70t-5; Car B: x = 6 - 50 t, y = 0
B) Car A: x = 0, y = 50t - 6; Car B: x = 70t - 5, y = 0
C) Car A: x = -70t + 5, y = 0; Car B: x = 6 - 50t, y = 0
D) Car A: x = 50t - 6, y = 0; Car B: x = 0, y = 50 - 70t
The parametric equations that describe the motion of cars A and B while Car A traveling north at 70 mph and car B is traveling west at 50 mph and they both are heading toward the same intersection :
Car A: x = -70t + 5, y = 0Car B: x = 6 - 50t, y = 0
So, Option C is the right answer.
According to the problem,Car A is moving northwards while car B is moving westwards with the speeds of 70 mph and 50 mph respectively. The cars are heading towards the same intersection.
Car A is 5 miles from the intersection and Car B is 6 miles from the intersection.
Using the equation of motion in two dimensions, the positions of cars A and B can be described in terms of their distances from the intersection and the time elapsed as:
x = distance traveled in x direction, y = distance traveled in y direction
Car A: Initial distance from intersection = 5 miles, Speed = 70 mph = (70/60)mph = (7/6)miles per minute. Time elapsed from start of the motion = t minute
Parametric equation of motion for Car A = (x, y) = (-70t+5,0)
Car B: Initial distance from intersection = 6 miles, Speed = 50 mph = (50/60)mph = (5/6)miles per minute. Time elapsed from start of the motion = t minute
Parametric equation of motion for Car B = (x, y) = (6-50t,0)
Therefore, the correct option is C) Car A: x = -70t + 5, y = 0; Car B: x = 6 - 50t, y = 0.
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two spheres are cut from a certain uniform rock. one has radius 4.45 cm. the mass of the other is six times greater. find its radius.
The radius of the second sphere is approximately 11.95 cm. This can be calculated by the volume of sphere.
What is the radius?The mass is proportional to the volume of the spheres. The volume of a sphere is given by the formula:
V = (4/3)πr³
Let the radius of the first sphere be r₁ (4.45 cm) and the radius of the second sphere be r₂. Given that the mass of the second sphere is six times greater than the first sphere, we can write:
M2 = 6 × M1
Since mass is proportional to volume, we can also say: V2 = 6 × V1
Now, substitute the volume formula for both spheres: (4/3)πr₂³ = 6×(4/3)πr₁³
Divide both sides by (4/3)π to simplify: r₂³ = 6 × r₁³
Plug in the value of r₁ (4.45 cm): r₂³ = 6 × (4.45)³
Now, calculate the value of r₂³: r₂³ ≈ 1683.107
Take the cube root of both sides to find r₂: r₂ ≈ (1683.107)^(1/3) r₂ ≈ 11.95 cm.
So, the radius of the second sphere is approximately 11.95 cm.
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the end result of a theory that is not verified is
Unproven theories ultimately cannot be regarded as scientific facts or principles and are not generally recognised by the scientific community.
A well-supported explanation of a natural occurrence in science that has passed rigorous examination and is backed by empirical data is referred to as a theory. A hypothesis, however, cannot be regarded as a scientific fact or principle if it is not backed up by empirical data or if it has not undergone extensive testing and verification. The scientific community frequently rejects unproven notions with scant empirical backing and may even label them as pseudoscientific or non-scientific. This is so that scientific theories and findings may be evaluated and verified frequently. Science does this by using evidence-based reasoning and critical thinking. Unproven theories are therefore eventually not regarded as being a part of the corpus of scientific knowledge.
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Suppose you have a 8.4 cm diameter fire hose with a 2.2 cm diameter nozzle.a. Calculate the pressure drop due to the Bernoulli effect as water enters the nozzle from the hose at the rate of 40.0 L/s. Take 1.00 × 103 kg/m3 for the density of the water.b. To what maximum height, in meters, above the nozzle can this water rise? (The actual height will be significantly smaller due to air resistance.)
The pressure drop due to the Bernoulli effect is 33.14 Pa. and
A). P1 + (1/2)ρv1² = P2 + (1/2)ρv2²
P1 + (1/2)ρv1² = P2 + (1/2)ρ(7.28v1)²
P1 - P2 = (1/2)ρ(v2² - v1²)
P1 - P2 = (1/2)(1000 kg/m³)(7.28² - 1) v1²
P1 - P2 = 20,710 v1²
Substituting the values, we get:
P1 - P2 = 20,710 (0.040)²
P1 - P2 = 33.14 Pa
B). (1/2)mv2² = mgh
The mass of water that enters the nozzle per second is:
ρAv2 = (1000 kg/m³)(3.8 cm²)(7.28v1)
ρAv2 = 26.86v1
Substituting this into the conservation of energy equation, we get:
(1/2)(26.86v1)v2^2 = (26.86v1)gh
v2^2 = 2gh
Substituting the value of v2 from part (a), we get:
(7.28v1)² = 2gh
Solving for h, we get:
h = ((7.28v1)²)/(2g)
h = ((7.28(40.0/55.4))²)/(2(9.81))
h = 7.05 m
Pressure is a fundamental physical quantity that measures the force exerted per unit area. It is defined as the amount of force per unit area that is applied perpendicular to the surface of an object. Pressure is often represented by the symbol P, and its unit is Pascal (Pa), which is defined as one Newton per square meter (N/m²). In other words, if a force of one Newton is applied uniformly over an area of one square meter, then the pressure exerted is one Pascal.
Pressure can be measured in different ways, depending on the application. For example, in fluid dynamics, pressure can be measured using a manometer or a pressure gauge. In solid mechanics, pressure can be calculated using the stress tensor, which describes the distribution of forces within a solid object.
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two long parallel wires placed side-by-side on a horizontal table carry identical current straight toward you. from your point of view, the magnetic field at the point exactly between the two wires select one: a. points down. b. points toward you. c. is zero. d. points away from you.
The magnetic field at the point exactly between the two wires will point away from your point of view is zero. The correct option is C.
What is the magnetic field?The two currents in the wires create a parallel magnetic field, which is oriented so that the same pole is facing each other (in this case, the north pole). This causes the field lines to repel away from each other, creating a magnetic field that points away from the midpoint between the wires.
The magnetic field at the point exactly between the two wires is zero. Two parallel long wires that carry identical currents straight towards us are placed side by side on a horizontal table.
As a result, the net magnetic field is zero.
Therefore, the correct option is C.
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upslope fog hugging the mountain surface occurs when: question 12 options: a. air warms because of decreasing atmospheric pressure
b. eventually air cools to the dew-point temperature air warms because of decreasing atmospheric pressure
c. eventually air warms to the dew-point temperature air cools because of increasing atmospheric pressure
d. eventually air cools to the dew-point temperature air cools because of decreasing atmospheric pressure
e. eventually air cools to the dew-point temperature
A decrease in atmospheric pressure eventually causes air to cool to the dew-point temperature.
How does surface-hugging upslope fog on mountains occur?Fog on an upward slope forms adiabatically. The process through which ascending air cools and sinking air warms is known as adiabatic cooling. The air rises and cools as wet breezes blow in the direction of a mountain. The dew point temperature is reached as a result of the rising air cooling.
Upslope fog: what is it?This type happens when air is lifted by sloping terrain and is adiabatically cooled to its dew point and saturation. Depending on the observer's frame of reference, upslope fog can be seen as either a stratus cloud or a fog.
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a 5 mm diameter, 50 mm long glass tube filled with water is rotated at 1000 rpm. what is the pressure at point a?
A 5 mm diameter, 50 mm long glass tube filled with water is rotated at 1000 rpm. The pressure at point A is 24.525 Pa.
The pressure at point A in a 5 mm diameter, 50 mm long glass tube filled with water when rotated at 1000 rpm can be calculated using the equation P = ρgr, where ρ is the density of the water, g is the acceleration due to gravity, and r is the radius of the tube.
Since the tube is 5 mm in diameter, the radius is 2.5 mm. The density of water is 1000 kg/m3 and the acceleration due to gravity is 9.81 m/s2. Therefore, the pressure at point A can be calculated as follows:
P = 1000 * 9.81 * 2.5 * 10-3 = 24.525 Pa
Therefore, the pressure at point A in a 5 mm diameter, 50 mm long glass tube filled with water when rotated at 1000 rpm is 24.525 Pa.
It is important to note that the pressure at point A will depend on the density of the fluid, the acceleration due to gravity, and the radius of the tube. As such, the pressure can be different for other fluids and for tubes with different radii.
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A 1200-turn coil of wire that is 2. 3 cm in diameter is in a magnetic field that drops from 0. 13 T to 0 T in 12 ms. The axis of the coil is parallel to the field. What is the emf of the coil? Express your answer using two significant figures
In a magnetic field that decreases from 0. 13 T to 0 T in 12 ms, a wire coil with 1200-turns and a 2. 3 cm diameter is placed. The coil's axis is perpendicular to the field. The coil's emf is 0.059 V.
A coil of wire experiences an electromotive force (emf) when it is exposed to a fluctuating magnetic field. The magnetic field across the coil changes at a rate precisely proportionate to the emf. We are given the magnetic field, the coil's size, and its number of turns in this issue. We determine the change in magnetic flux through the coil as the magnetic field weakens over time using the magnetic flux formula. Lastly, we determine the induced emf in the coil using the emf formula. The response, 0.064 V, is the emf's magnitude, and the answer's negative sign denotes the flow of induced current.
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calculate the work done by gravity on the watermelon during its displacement from the roof to the ground
The work done by gravity on the watermelon during its displacement from the roof to the ground is 196 J.
The work done by gravity on the watermelon during its displacement from the roof to the ground can be calculated using the formula W = mgh, where W is the work done, m is the mass of the watermelon, g is the acceleration due to gravity and h is the height of the displacement.What is Work Done?Work done can be defined as the energy transferred when a force is applied to an object to move it over a certain distance. It is a scalar quantity and is measured in joules (J). The mass of the watermelon is not given in the question, so let us assume that the mass of the watermelon is 2 kg. The acceleration due to gravity, g is 9.8 m/s2, and the height of the displacement is not given in the question, so let us assume that the height of the displacement is 10 meters. Therefore, the work done by gravity on the watermelon during its displacement from the roof to the ground can be calculated as follows: W = mgh= (2 kg) (9.8 m/s2) (10 m)= 196J
Therefore, the work done by gravity on the watermelon during its displacement from the roof to the ground is 196 J.
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