Assignment:
1) A I-kg glider and a 2-kg glide both slide toward each other at I m/s on an air track. They collide and stick. The combined mass moves at a final peed of
A) 1/2 rn/s.
B) 1/3 m/s.
C) 116 m/s.
D) 1.5 rn/s.
2) If a monkey floating in outer space throws his hat away, the hat and the monkey will both
A) move away from each other, but at different speeds.
B) move away from each other at the same speed.
C) move a short distance and then slow down.
D) move a short distance and then go faster.
E) come to a stop after a few minutes.
3) A heavy truck and a small car rolling down a hill at the same speed arc forced to stop in the same amount of time. Compared with the force that stops the car, the force needed to stop the truck is
A) greater.
B) smaller.
C) the same.
4) Whether a truck comes to a stop by crashing into a haystack or a brick wall, the impulse is
A) greater with the haystack.
B) greater with the brick wall.
C) both the same
5) Compared with falling on a stone floor, a wine glass may not break when it falls on a carpeted floor because the
A) carpeted floor provides a smaller impulse.
B) stopping time is shorter on the carpet.
C) stopping time is longer on the carpet.
D) carpet provides a smaller impulse and a longer time.
6) A car traveling along the highway brakes to a stop over a certain distance. More braking force is required if the car has
A) more mass.
B) more momentum.
C) less stopping distance.
D) all of the above
E) none of the above
7) The speed of a 4-kg ball with a momenttun of 12 kg m/s is
A) 3 ails. B)4
B) 12 m/s.
C) 48 ma.
D) none of the above
8) A same-size iron ball and wooden ball are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater
A) speed.
B) acceleration.
C) momentum.
D) all of the above
E) none of the above
9) The work done in pushing a TV set a distance of 2 m with an average force of 20 N is A)2J.
A) 10 J.
B) 20 J.
C) 40 J.
D) 800 J.
10) A 1000•kg car and a 2000•kg car are hoisted to the same height. Raising the more massive car requires
A) less work.
B) as much work.
C) twice as much work.
D) four times as much work.
E) more than four times as much work.
11) If your car does work to climb a hill in one-third the usual time, you expend
A) one third as much power.
B) the usual power.
C) three times the usual power.
D) need more information.
12) An object has gravitational potential energy due to its
A) speed.
B) acceleration.
C) momentum.
D) location.
E) none of the above
13) A 2-kg ball is held 4 m above the ground. Relative to the ground its potential energy is
A)6 J. BM. C)32 J.
B) 80 J.
C) more than 80 J.
14) Two identical golf carts move at different speeds. The faster can has twice the speed and therefore has
A) twice the kinetic energy.
B) four times the kinetic energy.
C) eight times the kinetic energy.
D) none of the above
15) A feather and a coin dropped in a vacuum fall with equal
A) forces due to gravity.
B) accelerations.
C) kinetic energies.
D) none of these
16) A diver weighs 500 N and steps off a diving board 10 in above the water. He hits the water with kinetic energy of
A) 10 J.
B) 500 J.
C) 510 J.
D) 5000 J.
E) more than 50001
17) If a Ping-Pong ball (heavy) and a golf ball (light) both move in the same direction with the same amount of kinetic energy, the speed of the Ping-Tong ball must be
A) less than the golf ball.
B) more than the golf ball.
C) both the same
D) need more information
18) A bicycle that travels twice as fast as another identical bicycle when braking to a stop will skid
A) twice as far.
B) four times as far.
C) eight times as far
D) sixteen times as far.
E) depends on the bike's mass
19) When a cannon is fired. it recoils as the cannonball is set in motion. The cannon and cannonball ideally acquire equal
A) but opposite amounts of momentum.
B) amounts of kinetic energy.
C) both of these
D) neither of these
20) Two2-Ss pool balls roll toward each other and collide. Suppose after bouncing apart each moves at 4 m/s. This collision violates the conservation of
A) momentum.
B) energy.
C) both momentum and energy.
D) none of the above
21) A gun is initially at rest. A 0.1 kg bullet is then fired with a velocity of +1000 m/s. If the mass of the gun is 5 kg, what is the velocity of the gun after it has fired?
A) 0 rn/s
B) 2 m/s
C) -2 m/s
D) 5 in/s
E) -5 m/s
22) According to Newton, when the distance between two interacting objects doubles, the gravitational force is
A) half.
B) one-quarter.
C) the same.
D) twice as much.
E) four times as much.
23) If Earth's radius somehow increased with no change in mass, your weight would
A) increase also.
B) decrease.
C) stay the same.
24) A very massive object A and a less massive object B move toward each other under the influence of gravity. Which force, if either, is greater?
A) the force on A
B) the force on B
C) both forces are the same.
25) To make a profit a buyer purchases metal by weight at one altitude and sells it at the same price per pound at another altitude. The supplier should
A) buy at a high altitude and sell at a low altitude.
B) buy at a low altitude and sell at a high altitude.
C) it makes no difference.
26) When the distance between two stars decreases by one-third, the force between them
A) decreases by one-third.
B) decreases by one-hall
C) increases to twice as much
D) increases to nine times as much
E) none of the above
27) The Moon does not crash into Earth because
A) Earth's gravitational field is relatively weak at the Moon.
B) gravitational pull of other planets keeps the Moon up.
C) Moon has a sufficient tangential speed.
D) Moon has less mass than Earth.
E) none of the above
28) Which of these is a longitudinal wave?
A) sound
B) light
C) radio
D) all of the above
E) none of the above
29) An Earth satellite in an elliptical orbit travels fastest when it is
A) nearest Earth.
B) farthest from Earth.
C) everywhere along its orbit.
30) The only way to change the speed of a wave is to
A) change the frequency
B) change the wavelength
C) change the medium the wave is traveling in
D) all of the above
31) 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 closest to the planet.
B) greatest when farthest from the planet.
C) the same everywhere.
D) need more information
32) According to Kepler. the square of the orbital period of a planet is directly proportional to the
A) planet's average distance from the Sun.
B) square of the planet's average distance from the Sun.
C) cube of the planet's average distance from the Sun.
33) If you double the frequency of a vibrating object, its period
A) doubles.
B) halves.
C) is quartered.
34) An object that completes 10 vibrations in 20 seconds has a frequency of
A) 0.5 hertz.
B) 2 hertz.
C) 200 hertz.
35) Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave received at 100 megahertz is
A) 0.3 m.
B) 3.0 m.
C) 30 m.
D) 300 m.
E) none of the above
36) The vibrations of a transverse wave move
A) along the direction of wave travel.
B) at right angles to the direction of wave travel.
C) that changes with speed.
37) A water wave passes by a floating leaf that is made to oscillate up and down two complete cycles each second, which means that the wave's frequency is
A) 0.5 Hz.
B) I Hz.
C) 2 Hz.
D) 3 Hz.
E) 6 Hz.
38) A wave oscillates up and down two complete cycles each second. If the wave travels an average distance of 6 meters in one second, its wavelength is
A) 0.5 in.
B) I m.
C) 2 m.
D) 3 m.
E) 6 m.
39) Sound waves cannot travel in
A) air.
B) water.
C) steel.
D) a vacuum.
40) The speed of sound depends on
A) its frequency.
B) its amplitude.
C) the medium in which it travels.
D) all of the above
E) none of the above