The real truth is that there's always some friction, friction robs kinetic energy whenever he's moving, so eventually he stops going up and down. Then he has to put some muscle energy into it to go some more.
Friction is a force that opposes the relative motion or attempts at motion between two surfaces in contact. It is the reason why we feel resistance when we try to slide an object across a surface or why it takes effort to walk or run. Friction can occur between solids, liquids, and gases, although it is most commonly observed in solids.
The force of friction arises from the interactions between the microscopic irregularities on the surfaces in contact. As two surfaces slide past each other, the irregularities interlock and resist further motion. The greater the force pressing the surfaces together, the greater the friction force. Friction is a fundamental force of nature that has both positive and negative effects.
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What centripetal force is needed to keep a 2. 5kg model plane orbiting in a 45m radius if it completes one orbit in 12s?
A centripetal force of 0.55 N is needed to keep the model plane orbiting in a 45m radius if it completes one orbit in 12s.
To find the centripetal force needed to keep a 2.5kg model plane orbiting in a 45m radius, we can use the formula:
F = (m × v²) / r
where F is the centripetal force, m is the mass of the plane, v is its velocity, and r is the radius of the orbit. We can find the velocity of the plane using the formula:
v = 2 × π × r / T
where T is the time it takes to complete one orbit. In this case, T = 12s, so we get:
v = 2 × π × 45m / 12s = 9.42 m/s
Substituting the values into the first formula, we get:
F = (2.5kg × (9.42m/s)²) / 45m = 0.55 N
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imagine that earth was upright with no tilt. how would this affect the seasons?
Answer:
There would be no "seasons"
The person would always be subjected to the same amount of sunlight.
Since the earth is tilted at about 23 deg, a person at that latitude would be subjected to sunlight from overhead to sunlight that appears 46 deg N of vertical.
how was the heliocentric theory developed by copernicus different from the greek theory of geocentrism?
The geocentric model says that the earth is at the center of the cosmos or universe, and the planets, the sun and the moon, and the stars circles around it. The early heliocentric models consider the sun as the center, and the planets revolve around the sun.
a researcher is studying the distribution of auxin in roots and stems exposed to sunlight. he notices that more auxin collects in the sides of stems and roots that are not exposed to light. why?
The researcher's observation that more auxin collects in the sides of stems and roots that are not exposed to light is likely due to the phenomenon of phototropism.
In the process of phototropism, light influences the direction and rate of growth of plant cells. In particular, light induces the cells on one side of a stem or root to create less auxin than the cells on the shaded side. Less auxin is produced on the lighted side and more auxin is produced on the shaded side as a result. The hormone auxin is essential for controlling the growth and development of plants. Auxin generally promotes cell growth and elongation at greater concentrations while inhibiting cell elongation at lower concentrations. Since the cells on the lighted side of the stem or root will contain less auxin when there is light.
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Devon is running an experiment in which children are observed interacting with simple toys, and their behavior is coded based on different categories. Devon has two experimenters observing and coding the behavior. Devon computes a correlation coefficient to see if the two experimenters produce similar scores. Which of the following describes how Devon is attempting to verify his observational method?
a painter (of mass 68 kg) needs to reach out from a scaffolding to paint the side of a building, so he lays a plank across two bars of the scaffolding, and puts a heavy bucket of mass 29 kg directly over one of the bars (see figure). you can assume the plank is massless, and is long enough to reach to the other building. Otheexpertta.com If the bars are separated by distance 1 how far; d, from the bar on the the right can the painter walk before the plank starts to fall? Numeric A numeric value is expected and not an expression_
0.99. is the distance from the bar on the right the painter walk before the plank fell.
To solve the given problem, we have to use the principle of moments which states that a body is in rotational equilibrium if the sum of clockwise moments is equal to the sum of anti-clockwise moments.
Let the distance between the painter and the bar on the right be x.
Then the distance between the painter and the bar on the left is 1 − x.
We have to find the maximum value of x for which the plank does not tip over.
As the plank is in equilibrium, the net moment about any point should be zero.
Here we will take the moment about the bar on the left so the clockwise moment will be taken as positive and the anticlockwise moment as negative.
The moment due to the painter will be the product of the mass of the painter, the distance of the centre of gravity of the painter from the left bar which is (1−x)/2, and the acceleration due to gravity.
The moment due to the bucket of 29 kg will be the product of the mass of the bucket, the distance of the centre of gravity of the bucket from the left bar which is x, and the acceleration due to gravity.
The moment due to the plank is zero as the plank is massless and the plank's centre of gravity lies at the centre which is midway between the two bars.
The expression for the principle of moments is shown below:-
m1g (1 - x)/2 + m2g x = 0
where, m1 = mass of painter,
m2 = mass of bucket and
g = acceleration due to gravity
Substituting the given values we get:-
68 (9.8) (1 - x)/2 + 29 (9.8) x = 0
Simplifying the above equation, we get:-
333.4x + 330.4 = 0x = 0.99 m
a painter (of mass 68 kg) needs to reach out from a scaffolding to paint the side of a building, so he lays a plank across two bars of the scaffolding, and puts a heavy bucket of mass 29 kg directly over one of the bars (see figure).
you can assume the plank is massless, and is long enough to reach to the other building. f the bars are separated by distance 1 how far; d, from the bar on the the right can the painter walk before the plank starts to fall.
Thus, the painter can walk to a distance of 0.99 m from the right bar before the plank starts to fall.
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the sound level produced by one singer is 62 db. what would be the sound level produced by a chorus of 34 such singers (all singing at the same intensity at approximately the same distance as the original singer)? answer in units of db.
The sound level produced by a chorus of 34 such singers (all singing at the same intensity at approximately the same distance as the original singer) is 80.7 dB (rounded to one decimal place).
Sound intensity level or sound pressure level, measured in decibels (dB), is a logarithmic measure of the pressure of a sound relative to a reference value. The reference value used for sound intensity measurements is usually 10⁻¹² W/m². When the sound intensity doubles, the sound level increases by 3 dB.
Therefore, to calculate the sound level produced by a chorus of 34 such singers (all singing at the same intensity at approximately the same distance as the original singer), use the formula below.
L = 10 log (I/I₀) + 10 log (n)dB
where
I = intensity of one singerI₀ = reference value of sound intensityn = number of singersL = sound levelThus,
L = 10 log (I/I₀) + 10 log (n)dBL = 10 log (10⁻¹²/10⁻¹²) + 10 log (34) dB
L = 10 log (1) + 10 log (34) dBL = 0 + 15.1 dBL = 15.1 dB (rounded to one decimal place)
L = 62 + 15.1 dBL = 80.7 dB
Since the original sound level produced by one singer is 62 dB and the sound level produced by a chorus of 34 singers is 80.7 dB, the sound level produced by the chorus of 34 singers is 80.7 dB (rounded to one decimal place).
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Students in Chuck Stone's lab measure the speed of a steel ball to be 8.0 m/s when launched horizontally from a 1.0 m high tabletop. Their objective is to place a 20cm tall coffee can on the floor to catch the ball. Show that they score a bull's eye when the can is placed 3.2m from the base of the table.
The coffee can must be placed at least 0.2 meters below the final horizontal position, which would be about 3.2 meters from the base of the table. This can be proved by taking both the horizontal and vertical components of motion.
What is the motion of ball?We can use both the equations for horizontal and vertical motion. Since the ball is launched horizontally, only the horizontal equation is needed:
Horizontal Motion: xf = xi + vxt
where:
xf = final horizontal position
xi = initial horizontal position
vx = horizontal velocity
t = time elapsed
Since we know the initial horizontal position, the horizontal velocity, and the time elapsed, we can calculate the final horizontal position:
xf = 0 + 8.0 m/s × 2.5 s = 20 m
Now, the coffee can is 20 cm tall, which is equal to 0.2 m. The initial vertical position of the ball is 1.0 m. The final vertical position will be the same as the initial vertical position, since the ball is not subject to any vertical acceleration. Therefore, the coffee can must be placed 0.2 m below the final horizontal position, which would be 3.2 m from the base of the table.
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in which way is the planet uranus unique?responses it has seasons. it has seasons. it has a hot interior. it has a hot interior. it lacks an atmosphere. it lacks an atmosphere. it rotates on its side.
The planet Uranus is unique in that it rotates on its side, with an axial tilt of approximately 98 degrees.
This means that Uranus essentially orbits the sun on its side, with its poles facing towards and away from the sun at different times during its orbit.
This unusual orientation results in extreme seasonal variations, with each pole experiencing over 20 years of continuous sunlight followed by over 20 years of darkness.
Additionally, Uranus has a relatively cold interior and a thick atmosphere composed primarily of hydrogen, helium, and methane.
Therefore, the response "it rotates on its side" is correct which makes planet Uranus unique.
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is the current flowing out of a resistor smaller than the current flowing into it. if not, then do resistors not actually slow down the flow of charge. eplain and give exampes\
The current flowing out of a resistor is typically smaller than the current flowing into it. Resistors do not actually slow down the flow of charge, they merely convert electrical energy into heat.
The statement that the current flowing out of a resistor is smaller than the current flowing into it is correct. This is because resistors slow down the flow of charge. The amount of current flowing through a resistor is determined by the amount of voltage across the resistor and the resistance of the resistor. When the voltage across the resistor increases, the current flowing through it also increases.
Conversely, when the resistance of the resistor increases, the current flowing through it decreases. Resistors are used to control the flow of current in electrical circuits. They are used in a variety of applications, such as in voltage dividers, filters, and voltage regulators.
For example, a voltage divider is a circuit that divides a voltage into two or more parts. A voltage divider is made up of two resistors in series, and the output voltage is taken across one of the resistors. The amount of voltage across the output resistor is determined by the values of the two resistors.
If the two resistors are equal, the output voltage will be half the input voltage. If the output resistor is smaller than the input resistor, the output voltage will be less than half the input voltage. Conversely, if the output resistor is larger than the input resistor, the output voltage will be greater than half the input voltage.
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a. The Phillips curve is πt = πt^e+ (m + z) – αutRewrite this relation as a relation between the deviation of the unemployment rate from the natural rate of unemployment (NRU), inflation and expected inflation.b. When we derived the natural rate of unemployment using the wage setting and price setting equations, what condition on the price level and expected price level was imposed in part a?
a 421 kg block is puled up a 4.54 degree incline by a constant force f of 3282 n. the coefficient of friction mu between the block and the plane is 0.47. how fast in m/s will the block be moving 6 seconds after the pull is applied?
The block will be moving at 3.97 m/s 6 seconds after the pull is applied.
Given Mass of the block, m = 421 kg, Inclined angle, θ = 4.54°, Force applied, F = 3282 N, Coefficient of friction, μ = 0.47, Time, t = 6 s
Using Newton's second law of motion, F - μmg sin θ = ma
Where,
m = Mass of the block
g = Acceleration due to gravity
a = Acceleration of the block
Substituting the given values,
3282 - 0.47 × 421 × 9.81 × sin 4.54° = 421 × a
a = 0.6614 m/s²
Using kinematic equations of motion,
v = u + at
Where,
u = Initial velocity
v = Final velocity
a = Acceleration
t = Time
Since the initial velocity is zero, the above equation becomes
v = at
Substituting the values,
v = 0.6614 m/s² × 6 s
v = 3.97 m/s
Therefore, the block will be moving at 3.97 m/s 6 seconds after the pull is applied.
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a 150 kg cart on a flat surface is pulled by a force of 120 n at the 50 degrees with respect to the horizontal surface for a distance of 15 meters, what is the work done to the cart by the pulling force? ignore the friction between the cart and flat surface.
The work done to the cart by the pulling force is 16950 J.
Work is the transfer of energy that happens when a force makes an object move. To calculate the work done to an object, we multiply the force applied by the distance moved in the direction of the force
Given a force of 120 N applied at an angle of 50° with respect to the horizontal surface.
We can resolve the force into its horizontal and vertical components as follows:
Horizontal force, Fx = F cos θ = 120 cos 50° = 91.76 N
Vertical force, Fy = F sin θ = 120 sin 50° = 91.67 N
Ignoring friction, the net force acting on the cart is the horizontal force, Fx.
The acceleration produced by the force is given by:
F = ma => a = F / m => a = 91.76 / 150 = 0.611 m/s²
The displacement of the cart in the direction of the force is the same as the distance covered, which is given as 15 meters.
Therefore, the work done to the cart by the pulling force is given by: W = Fd cos θW = 91.76 × 15 × cos 50°W = 16950 J.
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how many revolutions per minute would a 25 m diameter ferris wheel need to make for the passengers to feel weightless
The number of revolutions per minute which a 25 m diameter ferris wheel would need to make for the passengers to feel weightless is 7.84 rotations per minute.
What is the number of revolutions?The rotational speed of a ferris wheel needs to reach 8.5 revolutions per minute (RPM) for passengers to experience weightlessness. To calculate the RPM of a 25m diameter ferris wheel, use the formula:
RPM = (distance/circumference) × 60.
The circumference of a 25 m ferris wheel is 157.07m. Therefore, the RPM of a 25m ferris wheel would be:
RPM = (25m/157.07m) × 60 = 7.84 RPM
Therefore, a 25m ferris wheel would need to rotate at a rate of 7.84 RPM for passengers to experience weightlessness.
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if the person in the boat were to push the sides of the boat down harder but with the same freuqncy explain how the waves that are produces would be different
If the person in the boat were to push the sides of the boat down harder but with the same frequency, the waves that are produced would be larger and more intense.
What is a wave?А wаve is а disturbаnce thаt trаvels through spаce аnd time, usuаlly trаnsferring energy from one plаce to аnother without cаusing аny permаnent disturbаnce. This disturbаnce cаn cаuse oscillаtions in the mediа through which it trаvels.
Wаve intensity is defined аs the аmount of energy thаt pаsses through а unit аreа in а unit of time. Wаve intensity is directly proportionаl to wаve аmplitude squаred, meаning thаt the greаter the wаve аmplitude, the greаter the wаve intensity.
When а wаve hаs more energy, it will cаuse greаter wаter displаcement аnd lаrger wаves. Аs а result, if the person in the boаt were to push the sides of the boаt down hаrder but with the sаme frequency, the wаves thаt аre produced would be lаrger аnd more intense.
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What are the 4 factors of material resistance?
The four factors of material resistance are temperature, strain rate, stress state, and environment.
Temperature affects the flow of material, strain rate refers to the speed at which it is deformed, stress state is the amount of force applied, and environment relates to the presence of contaminants or corrosive agents.
The four factors of material resistance are temperature, time, applied stress, and strain rate. These factors are important in determining the strength and durability of a material and its ability to resist deformation or failure.Temperature: The temperature of a material can have a significant impact on its strength and resistance to deformation. Higher temperatures can cause a material to soften and weaken, while lower temperatures can make it more brittle and prone to cracking.Time: The duration of an applied load or stress can affect a material's strength and ability to resist deformation. Over time, a material may experience creep, which is a gradual deformation under a sustained load.Applied Stress: The magnitude of an applied stress or load can also affect a material's resistance to deformation. Higher stress levels can cause a material to reach its yield strength or fracture point more quickly.Strain Rate: The rate at which a material is deformed can also impact its strength and resistance to deformation. Higher strain rates can cause a material to behave differently than it would under static loading conditions, and can lead to failure at lower stress levels.
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what are two characteristics of net forces that are balanced
Balanced net forces have equal and opposing forces that cancel each other out and provide a net force of zero, which does not alter the motion of an item.
An object's velocity remains constant and motion is unaltered when the net forces acting on it are balanced. This indicates that the thing is either stationary or moving continuously. When the forces exerted on an item are opposing in direction and of equal magnitude, they are said to be balanced forces. The forces in this situation cancel one another out, leaving a net force of zero. This can happen when one force is applied to an item and that object applies an equal and opposite force in the opposite direction to another object. It can also happen when two or more forces are applied in opposing directions and of equal magnitude. Understanding equilibrium and stability in physics requires a knowledge of the idea of balanced forces.
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The center of mass of an irregular rigid object is always located a) at the geometrical center of the object b) somewhere within the object c) both of the above d) none of the above
b) somewhere within the object. The center of mass of an irregular object is not always at its geometrical center but depends on its mass distribution, as in a non-uniform hammer where it is closer to the heavier end.
An object's center of mass is the location where all of its mass may be said to be concentrated. The center of mass may not lie in the geometric center of irregular objects with non-uniform mass distributions. Instead, it is influenced by the distribution of mass, with heavier parts having a greater impact on the location of the center of mass than lighter regions. In the case of a hammer, the heavier end will have a greater impact on the location of the center of mass than the lighter end. A key idea in physics is the center of mass since it has an impact on an object's motion and stability.
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A ball is thrown toward the ground. The figure shows the direction of the ball before it reaches the ground and the direction of the ball after it bounces off the ground. After the bounce, the ball leaves the ground with the same speed that it had before the bounce. The angle between the ground and the ball’s direction of travel is θ0 before and after the ball bounces off the ground. The positive directions are indicated in the figure
The momentum of the bouncing ball varies in accordance with the conservation of momentum concept. The ball bounces less than its initial height as well because heat, friction, and air resistance all deplete energy.
According to the conservation of momentum principle, momentum is conserved for each collision that takes place in an isolated system.
a) The overall momentum of a body, such as a ball dropped from a height, is preserved. Yet because some of the ball's momentum is transmitted to the earth, the ball's momentum changes.
b) After being dropped from a height H1, a ball of mass M bounces to a height H2, which is roughly half of H1. Since some of the energy in H2 is transformed to heat energy as a result of friction and air resistance, it has a lower value than H1 because its energy has been depleted. As a result, the ball bounces less than its initial height as well because heat, friction, and air resistance all deplete energy. SO, H2 <H1.
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Your question is incomplete. The complete question is:
A ball is thrown toward the ground. The figure shows the direction of the ball before it reaches the ground and the direction of the ball after it bounces off the ground. After the bounce, the ball leaves the ground at the same speed that it had before the bounce. The angle between the ground and the ball’s direction of travel is θ0 before and after the ball bounces off the ground. The positive directions are indicated in the figure. (a) Each grid below represents a component of the change in momentum of the ball as a result of the bounce. On each grid, draw a vector arrow to indicate the direction and relative magnitude of the change in momentum of the ball as a result of the bounce. If there is no change in momentum for a given component, write "NO CHANGE" under the corresponding grid. (b) A ball of mass M is released from rest at height H1 above the ground. After the ball reaches the ground, it bounces and travels to height H2 (about 1/2 of H1) above the ground, as shown in the figure. In a clear, coherent paragraph-length response that may also contain equations and drawings, explain, using the conservation of momentum and the conservation of energy, why H2 < H1?
A marble rolled down an inclined ramp with an acceleration of 0.500 m/s for 7.00 seconds will travel meters from the point where it was released, A. 12.3 B. 24.5 C. 1.80 D. None of the above
The marble that rolled down an inclined ramp with an acceleration of 0.500 m/s for 7.00 seconds will travel 12.3 meters from the point where it was released. Thus, the correct option is A.
What is the distance covered by marble?An inclined ramp is a simple machine that reduces the amount of force needed to move an object up an incline. The force that makes the marble move is gravity. When a ball is rolled down an inclined ramp, it gains speed and momentum due to gravity. The formula for the distance travelled by a ball is given by:
d = (1/2) × a × t²
where, a is the acceleration of the ball, t is the time for which the ball is rolled down the ramp, d is the distance travelled by the ball.
Using the above formula, we can calculate the distance travelled by the ball. So, substituting the given values in the formula:
d = (1/2) × 0.500 m/s² × (7.00 s)²
d = (1/2) × 0.500 m/s² × 49.00 s²
d = 12.3 meters
Therefore, the correct option is A.
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For the cantilever beam and loading shown, use superposition to determine the slope and deflection at the free end. Assume that the flexural rigidity El of the beam is constant. (Round the final answers to four decimal places.) L. PLR EL The slope (ec) at the free end is The deflection (Vc) at the free end is EI
The slope (θc) at the free end is 0.0073 radians and the deflection (Vc) at the free end is 0.0050 meters.
The slope (θc) at the free end of the cantilever beam and loading shown can be determined using superposition. The flexural rigidity (EI) of the beam is assumed to be constant.
Using superposition, the slope (θc) at the free end can be calculated by taking the sum of the individual slopes resulting from the two loadings:
θc = θPL + θR
The individual slopes for each loading are:
θPL = PL/EI and θR = R/2L
Substituting these into the equation above gives:
θc = (PL/EI) + (R/2L)
The deflection (Vc) at the free end can be determined similarly, by taking the sum of the individual deflections resulting from the two loadings:
Vc = VPL + VR
The individual deflections for each loading are:
VPL = PL2/(2EI) and VR = R2/(2L)
Substituting these into the equation above gives:
Vc = (PL2/(2EI)) + (R2/(2L))
Therefore, the slope (θc) at the free end is 0.0073 radians and the deflection (Vc) at the free end is 0.0050 meters.
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A two-stage rocket is traveling at 1210m/s with respect to the earth when the first stage runs out of fuel. Explosive bolts release the first stage and push it backward with a speed of 40m/s relative to the second stage after the explosion. The first stage is three times as massive as the second. What is the speed of the second stage after the separation???
(2). The air-track carts in the figure(Figure 1) are sliding to the right at 1.0 m/s. The spring between them has a spring constant of 140 N/m and is compressed 4.4 cm. The carts slide past a flame that burns through the string holding them together..What is the speed of 100-g cart?What is the speed of 300-g cart?
The speed of the second stage after the separation is 810m/s. The 100-g cart will have a speed three times faster than the 300-g cart.
The speed of the second stage after the separation is 810m/s. This is because when the first stage runs out of fuel and the explosive bolts push it backward, the momentum of the two stages is conserved. The momentum of the second stage increases, while the momentum of the first stage decreases. Since the first stage is three times as massive as the second stage, the momentum of the second stage increases three times as much as the momentum of the first stage decreases. Therefore, the speed of the second stage after the separation is 1210m/s - (3*40m/s) = 810m/s.
For the air-track carts, the speed of the 100-g cart is 1.8 m/s and the speed of the 300-g cart is 0.8 m/s. This is because the spring is released when the string is burned and the carts experience a force from the spring that changes their velocities. The force applied to the carts is proportional to their mass, with the 100-g cart experiencing a force that is three times stronger than the 300-g cart. Therefore, the 100-g cart will have a speed three times faster than the 300-g cart.
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a solid plastic cylinder of radius 2.33 cm and length 6.30 cm. find the net charge of this cylinder, in nc (nanocoulombs), if it carries a uniform volumetric charge density of 540 nc/m3 throughout the whole volume of the plastic.
The net charge of a solid plastic cylinder of radius 2.33 cm and length 6.30 cm, carrying a uniform volumetric charge density of 540 nc/m3, is equal to 0.0583 nC (nanocoulombs)
To determine the net charge of a cylinder, the formula Q =ρV has to be used where Q is the net charge, ρ is the uniform volumetric charge density, and V is the volume of the cylinder.
ρ is given as 540 nc/m³.
V is calculated using the formula
V = πr²h
where r is the radius and h is the length.
π is approximated to be 3.14.
h is given as 6.30cm
r is 2.33cm
so the calculation for V becomes;
V = πr²h
V = 3.14 x 2.33² x 6.3
V = 108.02 cm³ or 108.02 x 10⁻⁶ m³.
Substitute the values of Q and V into the equation and solve for Q:
Q = ρVQ = 540 nc/m³ x 108.02 x 10⁻⁶ m³
Q = 0.0583 nc (to 3 decimal places)
Therefore the net charge of this cylinder, in nc (nanocoulombs) is 0.0583nc.
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Some consumers, like lions, do not eat plants or any other producers. They only eat other animals.
How do lions obtain the carbon they need?
by eating animals that have carbon-based molecules stored in their bodies
by breathing it in from the atmosphere in the form of carbon dioxide
by absorbing carbon-based molecules through their skin from the soil
by drinking water that contains carbon dioxide
Lions obtain carbon they need by eating the animals that have carbon-based molecules stored in their bodies.
How do lions obtain the carbon they need?When lions consume flesh of other animals, they break down organic molecules, such as carbohydrates, proteins, and fats, that are present in the animal's body. These organic molecules contain carbon atoms that are used by lion to build its own body and obtain energy.
Breathing in carbon dioxide from the atmosphere would not be a significant source of carbon for lions, as they do not have a mechanism to extract carbon from carbon dioxide. Similarly, absorbing carbon-based molecules through their skin from soil or drinking water that contains carbon dioxide would not be effective way for lions to obtain carbon, as these sources are not available in large enough quantities to support lion's needs.
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Answer:
It is A.Explanation:
by eating animals that have carbon-based molecules stored in their bodies.
hope this helps good day
if i move 3 m east and 4 m north what is my displacement
If I move 3 m east and 4 m north, then my displacement would be 5m.
What do you understand by displacement?In geometry and mechanics, displacement is defined as a vector whose length is the shortest distance from initial to the final position of a point P undergoing the motion.
If an object moves relative to the reference frame—for example, if professor moves to the right relative to whiteboard or passenger moves toward the rear of airplane—then object's position changes. And this change in position is known as displacement.
Given AB= 3m east and BC= 4m north
AC= √ 3² + 4²= 25
So, AC, displacement = 5m
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Describe such a motion from every day experience of deceleration to acceleration
Answer:
Throwing a ball up into the air. The ball will going accelerate up, then slowing down due to gravity, briefly stop, and then accelerating on its way down to the floor.
Explanation:
The blades of a fan running at low speed turn at 290 rpm. When the fan is switched to high speed, the rotation rate increases uniformly to 330 rpm in 5.56 s.
(a) What is the magnitude of the angular acceleration of the blades?
(b) How many revolutions do the blades go through while the fan is accelerating?
(a) The magnitude of the angular acceleration of the blades is 10.79 rad/s².
(b) The blades go through 6.78 revolutions while the fan is accelerating.
Rotation: Rotation is the spinning of a body around its axis. The rotation axis is an imaginary line that goes through the center of mass of the object and is perpendicular to the plane of rotation.
Magnitude: The magnitude refers to the size of the object or its strength, and it is measured using units.
Revolutions: Revolutions are used to measure the number of times an object rotates around its axis. One revolution occurs when the object rotates once around its axis.
Angular acceleration: Angular acceleration is the rate of change of angular velocity, expressed in rad/s². When a rotating object changes its speed, its angular acceleration changes as well.
According to the problem, the initial angular velocity of the fan is 290 rpm, and its final angular velocity is 330 rpm. The time it takes for the fan to reach this velocity is 5.56 seconds.
Therefore, the final angular velocity is given by:
v_f = v_i + αt
330 = 290 + αt
(5.56)40 = 5.56α
α = 40/5.56 = 7.19 rad/s²
(a) The magnitude of the angular acceleration of the blades is 7.19 rad/s².
However, the question asks for the magnitude of the angular acceleration, which is the absolute value of α.
Therefore, the magnitude of the angular acceleration of the blades is 7.19 rad/s².
The average angular velocity of the fan during the acceleration period is given by:
ω_avg = (ω_i + ω_f)/2ω_avg = (290 + 330)/2 = 310 rpm
When expressed in rad/s, the average angular velocity is:
ω_avg = (310/60)(2π) = 10.33 rad/s
The number of revolutions the blades go through while the fan is accelerating is given by:
θ = ω_it + (1/2)αt²
θ = (290/60)(2π)(5.56) + (1/2)(7.19)(5.56)²
θ = 3.27π + 109.74θ = 114.44 rad
The number of revolutions is found by dividing the angle by 2π:
rev = θ/(2π)rev = 114.44/(2π)rev ≈ 6.78 revolutions
Therefore, the blades go through 6.78 revolutions while the fan is accelerating.
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A __________ pollutant interacts with a part of the atmosphere and becomes a __________ pollutant.primary; secondarysecondary ; primary
A primary pollutant interacts with a part of the atmosphere and becomes a secondary pollutant.
No additional chemical reactions are required for a primary pollutant to interact with the atmosphere and become a pollution. Carbon monoxide, sulfur dioxide, nitrogen oxides, and particulate matter are a few examples of main pollutants. A secondary pollutant, on the other hand, is not immediately released into the atmosphere; instead, it develops as a result of chemical interactions between primary pollutants and other atmospheric constituents. Ozone, sulfuric acid, and nitric acid are a few examples of secondary pollutants. the following is the appropriate response to the stated question: A secondary pollutant is created when a primary pollutant interacts with a component of the atmosphere.
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if the open circuit voltage of a circuit containing ideal sources and resistors is measured at 10 , while the current through the short circuit across the circuit is 400 , what would be the power absorbed by a 60 resistor placed across the terminals?
The power absorbed by a 60 resistor placed across the terminals would be 166.67 mW.
The power absorbed by a 60 ohm resistor placed across the terminals of a circuit containing ideal sources and resistors can be calculated using the formula Power = (Open Circuit Voltage)2 / Resistance. In this case, the open circuit voltage is 10V and the resistance is 60 ohms. Therefore, the power absorbed by the resistor is 102 / 60 = 166.67 mW.
To calculate the open circuit voltage, you first need to find the total current in the circuit. The total current is equal to the current through the short circuit, 400A. Then, using Ohm's law (V = I x R), you can calculate the open circuit voltage by multiplying the total current by the total resistance of the circuit.
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Articulate succinctly (and use a sketch if helpful) why the sign of the wave-function matters when two or more atoms form bonds.
The sign of the wave-function is crucial to understand the chemical bonding of two or more atoms. It is responsible for providing stability and the formation of covalent bonds. Covalent bonds are characterized by the sharing of electrons between two or more atoms to achieve a stable state.
What is Covalent bonds?The two hydrogen atoms share an electron in their 1s orbital. When the two atoms approach each other, their 1s orbitals overlap, and the wave-function of each electron combines. This combination of wave-function occurs because of the Schrödinger wave equation.
The significance of the sign of the wave-function is that it determines the probability of an electron's presence in a particular area around the nucleus of an atom. The Schrödinger wave equation is sensitive to the sign of the wave-function because the wave-function squared gives the probability density of the electron's presence.
Therefore, when two atoms come together to form a bond, the sign of the wave-function becomes critical. If the signs of the wave-function for the two hydrogen atoms are the same, the probability of the two electrons sharing space increases, which results in a stable molecule. If the signs of the wave-function are different, the probability of electron sharing decreases, which results in an unstable molecule.
A sketch can be helpful to understand the concept of covalent bonding. When two hydrogen atoms come together to form a molecule, they share an electron in their 1s orbitals, resulting in a stable molecule. A sketch will provide a visual representation of the sharing of electrons between the two atoms.
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