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physics 150 ch6 quiz
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Gravity
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On a smooth horizontal floor, an object slides into a spring which is attached to another mass that is initially stationary. When the spring is most compressed, both objects are moving at the same speed. Ignoring friction, what is conserved during this interaction?
both momentum and mechanical energy
A small car has a head-on collision with a large truck. Which of the following statements concerning the magnitude of the average force due to the collision is correct?
The small car and the truck experience the same average force.
In an ELASTIC collision between two perfectly rigid objects
both the momentum and the kinetic energy of the system are conserved
In an INELASTIC collision between two objects
the momentum of the system is conserved but the kinetic energy of the system is not conserved.
A shell explodes into two fragments, one fragment 25 times heavier than the other. If any gas from the explosion has negligible mass, then
the momentum change of the lighter fragment is exactly the same as the momentum change of the heavier fragment
A 2.50-kg stone is dropped from rest at a height of 3.75 m. What impulse does gravity impart to this stone from the instant it is dropped until it hits the ground, assuming negligible air resistance?
21.4 N ∙ s
A 620-g object traveling at 2.1 m/s collides head-on with a 320-g object traveling in the opposite direction at 3.8 m/s. If the collision is perfectly elastic, what is the change in the kinetic energy of the 620-g object?
It loses 0.23 J.
A 2.3-kg object traveling at 6.1 m/s collides head-on with a 3.5-kg object traveling in the opposite direction at 4.8 m/s. If the collision is perfectly elastic, what is the final speed of the 2.3-kg object?
7.1 m/s
A billiard ball traveling at 3.00 m/s collides perfectly elastically with an identical billiard ball initially at rest on the level table. The initially moving billiard ball deflects 30.0° from its original direction. What is the speed of the initially stationary billiard ball after the collision?
1.50 m/s
A 2.00-kg object traveling east at 20.0 m/s collides with a 3.00-kg object traveling west at 10.0 m/s. After the collision, the 2.00-kg object has a velocity 5.00 m/s to the west. How much kinetic energy was lost during the collision?
458 J
Two objects of the same mass move along the same line in opposite directions. The first mass is moving with speed v. The objects collide, stick together, and move with speed 0.100v in the direction of the velocity of the first mass before the collision. What was the speed of the second mass before the collision?
0.800v
A 2.00-m rod of negligible mass connects two very small objects at its ends. The mass of one object is 1.00 kg and the mass of the other is unknown. The center of mass of this system is on the rod a distance 1.60 m from the 1.00-kg mass object. What is the mass of the other object?
4.00 kg
If a 5-kg object experiences a 10-N force for a duration of 0.10-second, then what is the impulse on the object?
1.0 N*s
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A parallel plate capacitor is initially uncharged. Then it is fully charged up by removing electrons from one plate and placing them on the other plate. Is the mass of the capacitor greater when it is (a) uncharged or (b) fully charged?
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An orange is dropped at the same time a bullet is shot from a gun. Which of the following is true? A. The acceleration due to gravity is greater for the orange because the orange is heavier. B. Gravity acts less on the bullet than on the orange because the bullet is moving so fast. C. The velocities will be the same. D. The two objects will hit the ground at the same time.
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A sample of pure copper has a mass of 12.5 g. Calculate the number of moles in the sample.
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A speck of dust of mass $0.10 \mu g$ floats between two oppositely charged horizontal metal plates separated by $0.10$ $m$.The potential difference between the plates is $200 \mathrm{V}$.The speck is not falling at first, but when a beam of ultraviolet light hits it, it starts accelerating downward. However, increasing the potential difference to $250 \mathrm{V}$ reduces the downward acceleration of the speck to zero. Explain the phenomenon qualitatively and quantitatively using symbols.
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