You push very hard on a heavy desk, trying to move it. You do work on the desk
answer
only if it starts moving
question
A satellite in circular orbit around the Earth moves at constant speed. This orbit is maintained by the force of gravity between the Earth and the satellite, yet no work is done on the satellite. How is this possible?
answer
No work is done if the direction of motion is perpendicular to the force.
question
When the speed of your car is doubled, by what factor does its kinetic energy increase?
answer
4
question
What would be the car's minimum stopping distance if it were traveling at a velocity of 2v?
answer
4d
question
A bowling ball is dropped from a height h onto the center of a trampoline, which launches the ball back up into the air.
answer
No more than h-probably a little less.
question
A ball is thrown straight up. At what point does the ball have the most energy? Ignore air resistance.
answer
Everywhere; the energy of the ball is the same at all of these points.
question
Engines, including car engines, are rated in horsepower. What is horsepower?
answer
The rate at which the engine can do work.
question
A man pushes a block up an incline at a constant speed. As the block moves up the incline
answer
its potential energy increases and its kinetic energy remains the same.
question
Neglecting air resistance, which statement is not true regarding the energy of the ball?
answer
The potential energy decreases while the ball is going up.
question
A truck going 15 km/h has a head-on collision with a small car going 30 km/h.
answer
They both have the same change in magnitude of momentum because momentum is conserved.
question
A small boat coasts at constant speed under a bridge. A heavy sack of sand is dropped from the bridge onto the boat. The speed of the boat
answer
Decreases
question
Two identical billiard balls traveling at the same speed have a head-on collision and rebound. If the balls had twice the mass, but maintained the same size and speed, how would the rebound be different
answer
No difference.
question
The space shuttle, in circular orbit around the Earth, collides with a small asteroid which ends up in the shuttle's storage bay. For this collision,
answer
only momentum is conserved.
question
A golf ball and an equal-mass bean bag are dropped from the same height and hit the ground. The bean bag stays on the ground while the golf ball rebounds. Which experiences the greater impulse from the ground?
answer
The golf ball.
question
While the line of children is rotating, which of the following statements are correct
answer
The player at the front of the line has the smallest linear velocity.
All the children have the same angular acceleration.
question
Now consider the children's linear accelerations. Which of the following statements are correct?
answer
The last child in the line has the greatest tangential acceleration.
The last child in the line has the greatest radial acceleration.
question
Bonnie sits on the outer rim of a merry-go-round, and Jill sits midway between the center and the rim. The merry-go-round makes one complete revolution every 2 seconds. Jill's linear velocity is:
answer
half of Bonnie's.
question
If this object rotates through an angle ฮธ in time t, through what angle did it rotate in the time 1/2t?
answer
1/4ฮธ.
question
If larger-diameter tires are mounted on the car instead, how will that affect the speedometer reading? The speedometer
answer
will read low.
question
Of the following expressions, which ones give the correct torque produced by the force Fโ around point P?
answer
(48 N)(5.0 m).
(80 N)(5.0 m)(sin 37โ)).
(80 N)(3.0 m).
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