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					Physics: Review problems
1. What is the acceleration of a car that                     c. 250 m
   maintains a constant velocity of 50 m/s for                d. 500 m
   10 seconds?                                       9. A car accelerates at 2 m/s2. If it starts from
        a. 0                                             rest, how much time is needed to accelerate
        b. 5 m/s2                                        to a velocity of 30 m/s?
        c. 10 m/s2                                            a. 2 s
        d. 500 m/s2                                           b. 15 s
2. When an object is in free fall, its                        c. 30 s
        a. Velocity increases                                 d. 60 s
        b. Acceleration increases                    10. A ball is dropped from the top of the Empire
        c. Both of these                                 State Building. At the same moment, a ball
        d. Neither of these                              is thrown downward from the same location.
3. When an object is in free fall, the distance it       Neglecting air resistance, the acceleration is
   travels in each succeeding second is                  greater for
        a. Constant                                           a. The dropped ball
        b. Decreasing                                         b. The thrown ball
        c. Increasing                                         c. The same for both balls
        d. Depends on the shape of the object        11. A ball is dropped from the top of the Empire
4. Ten seconds after release, and object in free         State Building. At the same moment, a ball
   fall has velocity                                     is thrown downward from the same location.
        a. 5 m/s                                         Including air resistance, the acceleration is
        b. 10 m/s                                        greater for
        c. 50 m/s                                             a. The dropped ball
        d. 100 m/s                                            b. The thrown ball
5. A car accelerates at 2 m/s2. What is the                   c. The same for both balls
   speed 3 seconds after the car starts moving?      12. Someone standing at the edge of a cliff
        a. 2 m/s                                         throws one ball straight up and another ball
        b. 3m/s                                          straight down with the same velocity.
        c. 4 m/s                                         Neglecting air resistance, the ball that hits
        d. 6 m/s                                         the ground below with the greater speed is
6. A ball is thrown upwards and caught when it                a. The upward ball
   comes back down. In the presence of air                    b. The downward ball
   resistance, the speed when it is caught is                 c. Both have the same speed
        a. More than the initial upward speed        13. Someone standing at the edge of a cliff
        b. Less than the initial upward speed            throws one ball straight up and another ball
        c. Equal to the initial upward speed             straight down with the same velocity.
        d. Depends on if the wind is blowing.            Including air resistance, the ball that hits the
7. An object falls freely on a planet where the          ground below with the greater speed is
   acceleration due to gravity is 20 m/s2. After              a. The upward ball
   5 seconds, the speed is                                    b. The downward ball
        a. 5 m/s                                              c. Both have the same speed
        b. 20 m/s                                    14. A pot falls from a ledge and hits the ground
        c. 50 m/s                                        45 meters below. Neglecting air resistance,
        d. 100 m/s                                       the speed with which it hits the ground is
8. An object falls freely on a planet where the               a. 30 m/s
   acceleration due to gravity is 20 m/s2. After              b. 45 m/s
   5 seconds, the distance it has fallen is                   c. 60 m/s
        a. 20 m                                               d. 120 m/s
        b. 100 m
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Physics: Review problems
15. An airplane travels at a velocity of 282 m/s     22. Which moves faster (m/s) in a merry-go-
    towards the northeast. What is its                   round: a horse on the inside or a horse on
    component velocity due north?                        the outside?
         a. 82 m/s                                           a. Inside horse
         b. 141 m/s                                          b. Outside horse
         c. 200 m/s                                          c. Prettier horse
         d. 282 m/s                                          d. Both move at the same speed
16. A rock is thrown upward at an angle of 50°       23. Suppose you are on a Ferris wheel, seated
    to the ground. As it rises, its horizontal           10 m from the wheel’s axis of rotation. If
    component of velocity                                you make a complete rotation in 30 s, then
         a. Increases                                    your linear speed is approximately
         b. Decreases                                        a. 0.333 m/s
         c. Remains the same                                 b. 1.047 m/s
         d. Decreases at first, then increases               c. 2.094 m/s
17. A stone is thrown horizontally off a cliff.              d. 10 m/s
    One second after release it vertical distance    24. Compared to a 1-kg block of iron, a 2-kg
    below the cliff is                                   block of iron has twice as much
         a. 1 m                                              a. Inertia
         b. 5 m                                              b. Mass
         c. 10 m                                             c. Volume
         d. 20 m                                             d. All of these
18. A bullet is fired horizontally and hits the      25. A sheet of paper can be withdrawn from
    ground after 0.5 s. If another bullet was            under a glass of water without spilling if the
    fired horizontally with a much higher initial        paper is jerked quickly. This best
    speed, then it would hit the ground                  demonstrates that
    (neglecting air resistance) in                           a. The glass of water has no
         a. Less than 0.5 s                                      acceleration
         b. 0.5 s                                            b. There is an action-reaction pair of
         c. More than 0.5 s                                      forces
19. After a rock that is thrown straight up                  c. Gravity tends to hold the water
    reaches the top of its path and is starting to               secure
    fall back down, its acceleration is                      d. The glass of water has inertia
         a. Greater than at the top of the path      26. One object has twice the mass of another.
         b. Less than at the top of the path             The first object also must have twice as
         c. The same as at the top of the path           much
         d. Depends on how fast it was thrown                a. Inertia
20. What prevents the international space station            b. Velocity
    from falling to Earth?                                   c. Gravitational acceleration
         a. Lack of gravity                                  d. Volume
         b. Lack of air resistance                   27. A package falls off a truck that is moving 30
         c. Nothing – it’s falling all the time.         m/s. Neglecting air resistance, the
21. An airplane flies at 100 m/s at an altitude of       horizontal speed of the package just before it
    45 m. The pilot drops a heavy package that           hits the ground is
    falls to the ground. Where, approximately,               a. Zero
    does the package land?                                   b. Less than 30 m/s but more than zero
         a. Right beneath the plane                          c. 30 m/s
         b. 100 m beneath the plane                          d. More than 30 m/s
         c. 120 m behind the plane
         d. More than 120 m behind the plane.
                                                                                                     2
Physics: Review problems
28. A hockey puck is set in motion across a                  c. 10 times as much force
    frozen pond. If air resistance and ice                   d. 100 times as much force
    friction are negligible, then the net force on   35. A jumbo jet has a mass of 100,000 kg. The
    the hockey puck is                                   thrust for each of its four engines is 50,000
        a. Zero                                          N. What is the jet’s acceleration in m/s2?
        b. Equal to the weight of the puck                   a. 0.25
        c. The weight of the puck divided by                 b. 1
            the mass of the puck                             c. 2
        d. The mass of the puck multiplied by                d. 4
            10                                       36. A skydiver of mass 100 kg experiences 500
29. You and two astronauts report finding a              N of air resistance. What is her
    chunk of gold with weight 1 N. Who has               acceleration?
    the most gold?                                           a. 0.2 g
        a. The astronaut on the Moon                         b. 0.3 g
        b. The astronaut on Jupiter                          c. 0.4 g
        c. You, on the Earth                                 d. 0.5 g
        d. All of you have the same amount of        37. A car traveling at 22 m/s comes to an abrupt
            gold.                                        halt in 0.1 s when it hits a tree. The average
30. A 1-kg falling object encounters air                 deceleration in m/s2 is
    resistance of 4 N. The net force on the                  a. 110
    object is                                                b. 220
        a. 0 N                                               c. 800
        b. 4 N                                               d. 880
        c. 6 N                                       38. A 10-kg block with an initial velocity of 10
        d. 10 N                                          m/s slides 2 seconds across a horizontal
31. If an object has no acceleration, then we can        surface and comes to rest. The friction force
    say for certain that it is                           on the block is
        a. At rest                                           a. 5 N
        b. Moving with constant velocity                     b. 10 N
        c. In mechanical equilibrium                         c. 25 N
        d. All of these                                      d. 50 N
32. A car has a mass of 1000 kg and accelerates      39. A 5-kg block with an initial velocity of 10
    at 2 m/s2. The net force on the car is               m/s slides 10 meters across a horizontal
        a. 500 N                                         surface before coming to rest. The friction
        b. 1000 N                                        force on the block is
        c. 1500 N                                            a. 5 N
        d. 2000 N                                            b. 10 N
33. A student who weighs 60 kg stands on two                 c. 25 N
    bathroom scales so that each shows the same              d. 50 N
    measurement. The force on each scale is          40. A 2000-kg car experiences a braking force
        a. 100 N                                         of 10,000 N and skids to a stop in 6 seconds.
        b. 200 N                                         The speed of the car just before the brakes
        c. 300 N                                         were applied was
        d. 600 N                                             a. 1.2 m/s
34. A force on a 1-kg brick accelerates it. To               b. 15 m/s
    equally accelerate a 10-kg brick you would               c. 30 m/s
    have to push with                                        d. 45 m/s
        a. Just as much force
        b. One-tenth as much force
                                                                                                     3
Physics: Review problems
41. A large person and a small person wish to        47. A Hummer and a Mini traveling at the same
    parachute at equal terminal velocities. The          speed collide. The force of impact is greater
    larger person will have to                           on
        a. Get a larger parachute                            a. The Hummer
        b. Jump lightly leaving the plane                    b. The Mini
        c. Pull upward on the supporting                     c. Is the same for both
            strands to decrease the downward net             d. Depends on the angle of the collision
            force                                    48. A Hummer and a Mini traveling at the same
        d. Jump first from the plane                     speed collide. The vehicle that undergoes
42. A panther and a feather fall from a tree             the greater change in velocity is
    through the air to the ground below. The                 a. The Hummer
    force of air resistance is greater on the                b. The Mini
        a. Panther                                           c. Both are equal
        b. Feather                                           d. Depends on the angle of the collision
        c. The same on both                          49. Two people pull on a rope in a tug-of-war.
        d. Depends on the height of the fall             Each pulls with a force of 400 N. The
43. A skydiver steps from a stationary helicopter        tension in the rope is
    and falls for 5 s before reaching her terminal           a. Zero
    velocity. During the 5-second fall her                   b. 200 N
    acceleration                                             c. 400 N
        a. Is constant                                       d. 600 N
        b. Increases                                         e. 800 N
        c. Decreases                                 50. Two people are on frictionless ice, one with
        d. Is zero                                       mass 40 kg and one with mass 80 kg. They
44. A 500-N parachutist opens his chute and              pull hand-over-hand on a 12-meter rope and
    experiences an air resistance of 800 N. The          meet. The heavier person has slid a distance
    net force on the parachutist is                      of
        a. 300 N downward                                    a. 3 m
        b. 500 N downward                                    b. 4 m
        c. 800 N downward                                    c. 6 m
        d. 300 N upward                                      d. 8 m
45. A ball is thrown straight up and takes 10
    seconds to go up and return to the ground.
    Because of air resistance, the time taken for
    the ball to just go up to its maximum height
    is
        a. Less than 5 s
        b. 5 s
        c. More than 5 s
        d. Impossible to tell
46. A player hits a ball with a bat. If the action
    force is the force of the bat on the ball, the
    reaction force is
        a. The force of the bat on the player’s
            hands
        b. The muscular effort of the batter
        c. The force of the ball on the bat
        d. The friction of the player’s shoes on
            the ground
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Physics: Review problems
51. A Hummer and a Mini are traveling on a                    a. 4 kg
    highway at the same speed. If the Hummer                  b. 12 kg
    has twice the mass of the Mini, then the                  c. 48 kg
    Hummer’s momentum is                                      d. 192 kg
         a. The same as the Mini                      58. A karate expert executes a swift blow and
         b. Half that of the Mini                         severs a cement block with her bare hand.
         c. Twice that of the Mini                        The magnitude is the same for the
         d. Four times that of the Mini                       a. Impulse on the block and the hand
52. It is correct to say that impulse equals                  b. Force on the block and the hand
         a. Momentum                                          c. Time of impact on the block and the
         b. The change in momentum                                hand
         c. The force multiplied by a distance                d. All of these
         d. All of these                              59. A 1-kg chunk of putty moving at 1 m/s
53. A heavy truck and a light truck roll down a           collides and sticks to a 5-kg block on
    hill. Neglecting friction, at the bottom of the       frictionless ice. The block and putty then
    hill the heavy truck will have greater                move with momentum of
         a. Speed                                             a. 0 kg m/s
         b. Acceleration                                      b. 1 kg m/s
         c. Momentum                                          c. 5 kg m/s
         d. All of these                                      d. 6 kg m/s
54. In order to catch a baseball, a player extends    60. The force that accelerates a rocket in outer
    his hand forward before the impact of the             space is exerted on the rocket by
    ball and then lets it ride backward in the                a. The rocket’s engines
    direction of the ball’s motion upon impact.               b. The rocket’s wings
    Doing this reduces the force of impact on                 c. Atmospheric pressure
    the player’s hand principally because                     d. Exhaust gasses
         a. The velocity of impact is lessened        61. A cannonball shot from a cannon with a
         b. The momentum of impact is lessened            long barrel will have a greater velocity
         c. The time of impact is increased               because the cannonball receives a greater
         d. The time of impact is decreased                   a. Force
55. A bullet is fired from a gun. The speed of                b. Impulse
    the bullet will be the same as the speed of               c. Both of these
    the recoiling gun                                         d. Neither of these
         a. Because momentum is conserved             62. A 10-kg fish swimming at a velocity of 1
         b. Because velocity is conserved                 m/s swallows an absent-minded 2-kg fish
         c. Because both velocity and                     swimming towards it at 4 m/s. The speed of
             momentum are conserved                       the larger fish after lunch is
         d. Only if the mass of the bullet and                a. 1/2 m/s
             gun are equal                                    b. 1/5 m/s
56. The force on an apple hitting the ground                  c. 1/6 m/s
    depends on                                                d. 2/3 m/s
         a. The speed of the apple just before it     63. A 1-kg chunk of putty moving at 1 m/s
             hits the ground                              collides and sticks to a 5-kg block on
         b. The time of impact with the ground            frictionless ice. The block and putty then
         c. Whether or not the apple bounces              move with velocity of
         d. All of these                                      a. 1/2 m/s
57. A ball is moving at 4 m/s and has a                       b. 1/5 m/s
    momentum of 48 kg m/s. What is the ball’s                 c. 1/6 m/s
    mass?                                                     d. 2/3 m/s
                                                                                                     5
Physics: Review problems
64. Suppose an astronaut in outer space wants to      70. A bow is drawn with an arrow so that it has
    play a solitary game of “throw, bounce,               300 J of potential energy. When the bow is
    catch” by tossing a ball against the wall of          released the arrow will have kinetic energy
    the international space station. If the ball is            a. Less than 300 J
    as massive as the astronaut, the astronaut                 b. 300 J
         a. Will catch one bounce only                         c. More than 300 J
         b. Will never catch the first bounce                  d. It depends on the bow
         c. Will see that the time between            71. No work is done on a bowling ball that rolls
            catches increases                             along a bowling alley because
         d. Can’t predict what will happen                     a. No force acts on the ball
            without knowing more about how                     b. No distance is covered by the ball
            the ball and ISS interact                          c. The force on the ball is at right
65. A golf ball moving forward with 1 unit of                     angles to the ball’s motion
    momentum strikes and bounces backward                      d. No potential energy is converted into
    off a heavy bowling ball that is initially at                 kinetic energy
    rest. The bowling ball is set into motion         72. It takes 40 J of energy to slide a heavy box 4
    with momentum                                         m across the floor. The force applied is
         a. Less than 1 unit                                   a. 4 N
         b. Exactly 1 unit                                     b. 10 N
         c. More than one unit                                 c. 40 N
         d. Not enough information to decide                   d. 160 N
66. If you push an object twice as far while          73. A 2-kg mass has 40 J of potential energy
    applying the same force you do                        relative to the ground. How high is it?
         a. Half as much work                                  a. 1 m
         b. The same amount of work                            b. 2 m
         c. Twice as much work                                 c. 3 m
         d. Four times as much work                            d. 4 m
67. Lifting a heavy object to a height of 10          74. A car passes an identical car traveling four
    meters is done slowly, while an identical             times as fast as the slower car. The kinetic
    object is lifted to the same height quickly.          energy of the faster car is
    Both jobs require                                          a. Four times as much
         a. The same work but different energy                 b. Eight times as much
         b. The same work but different power                  c. Twelve times as much
         c. The same work and the same power                   d. Sixteen times as much
         d. Different amount of work and power        75. A ball is thrown upward with 100 J of
68. If a student exerts 100 J of energy in 50 s,          kinetic energy. Accounting for air
    then her power output is                              resistance, the kinetic energy of the ball
         a. 1/4 W                                         when it is caught is
         b. 1/2 W                                              a. Less than 100 J
         c. 2 W                                                b. 100 J
         d. 4 W                                                c. More than 100 J
69. When an object is lifted 10 meters it gains a              d. Depends on the kind of ball
    certain amount of potential energy. If it is      76. A machine puts out 100 W of power for
    lifted 20 meters its potential energy gain is         every 1000 W of fuel put into it. The
         a. Half as much                                  efficiency of the machine is
         b. The same                                           a. 5%
         c. Twice as much                                      b. 10%
         d. Four times as much                                 c. 90%
                                                               d. 110%
                                                                                                       6
Physics: Review problems
77. A car moving at 20 m/s skids 20 m with its               a. More momentum, less kinetic energy
    brakes locked. How far will it skid with its             b. Less momentum, less kinetic energy
    brakes locked if it is traveling 60 m/s?                 c. More momentum, more kinetic
        a. 20 m                                                  energy
        b. 60 m                                              d. Less momentum, more kinetic
        c. 120 m                                                 energy
        d. 180 m                                     84. A piece of taffy slams into and sticks to an
78. Which requires most work done by the                 identical piece of taffy at rest. What
    brakes of a car?                                     percentage of the kinetic energy is lost to
        a. Slowing from 75 to 60 mph                     heat?
        b. Slowing from 60 to 40 mph                         a. 0 %
        c. Slowing from 40 to 20 mph                         b. 25%
        d. Slowing from 40 to 0 mph                          c. 50 %
79. Two identical arrows, one with twice the                 d. 75%
    speed of the other, are fired into a hay bale.   85. A coin and a ring roll down a ramp. The
    The faster arrow will penetrate                      one to reach the bottom first is the
        a. The same distance as the slower                   a. Coin
        b. Twice as far as the slower                        b. Ring
        c. Four times as far as the slower                   c. Both reach the bottom at the same
        d. More than four times as far                           time
80. A kilowatt-hour is the amount of energy                  d. Not enough information
    needed to exert one kilowatt of power for        86. A torque acting on an object tends to
    one hour. This is equal to                           produce
        a. 60 J                                              a. Equilibrium
        b. 3600 J                                            b. Rotation
        c. 36,000 J                                          c. Linear motion
        d. 3,600,000 J                                       d. A center of gravity
81. A car’s engine is 20% efficient. When            87. On a balance see-saw, a boy three times as
    cruising, it encounters an average retarding         heavy as his partner sits
    force of 1000 N. If the energy content of                a. 1/6 the distance from the fulcrum
    gasoline is 1.6 x 108 J/gallon, the car’s                b. 1/3 the distance from the fulcrum
    mileage will be                                          c. 2/3 the distance from the fulcrum
        a. 56 km/gallon                                      d. The same distance from the fulcrum
        b. 48 km/gallon                              88. If you put a pipe over the end of a wrench
        c. 40 km/gal                                     when trying to loosen a stubborn bolt, and
        d. 32 km/gal                                     you effectively make the wrench handle
82. Two pool balls, each moving at 2 m/s                 twice as long, you increase the torque by
    collide and bounce apart. If a student                   a. Two
    reports that they are now both traveling at 4            b. Three
    m/s, you know this is incorrect since it                 c. Four
    would violate                                            d. Eight
        a. Conservation of momentum                  89. You actually weigh a little less at the
        b. Conservation of energy                        equator than you do at the North Pole. This
        c. Both of these                                 is mainly due to
        d. Neither of these                                  a. Spin of the earth
83. A moving golf ball collides with a bowling               b. Tidal bulges
    ball at rest and bounces backwards. After                c. Higher temperatures at the equator
    the collision, the bowling ball, compared to             d. Influence of the moon
    the golf ball, has
                                                                                                   7
Physics: Review problems
90. To turn a stubborn screw, it is best to use a             b. The mounted tire if the tire is lighter
    screwdriver with                                              than the rim
         a. A skinny handle                                   c. The mounted tire if it is the same
         b. A fat handle                                          weight as the rim
         c. A yellow handle                                   d. The mounted tire regardless of its
         d. A wooden handle                                       weight
91. A 1-kg rock is suspended from the tip of a        97. A satellite that is 4 times as far away from a
    meter stick at the 0-cm mark. If the meter            planet as an identical satellite moves with
    stick balances with a fulcrum at the 25-cm            half the velocity. Its angular momentum is
    mark, the mass of the meter stick is                      a. Half as much as the closer satellite
         a. 1/4 kg                                            b. The same as the closer satellite
         b. 1/2 kg                                            c. Twice as much as the closer satellite
         c. 3/4 kg                                            d. Four times as much as the closer
         d. 1 kg                                                  satellite
92. A ball rolls down a hill mainly because of        98. A space habitat of the future is a cylinder
         a. Unbalanced torque                             rotating in space about its long axis. The
         b. Unbalanced force                              simulated gravitation field along the axis of
         c. Its rotational inertia                        the habitat is
         d. Angular momentum                                  a. Zero
93. A car travels in a circle with constant speed.            b. g
    The net force on the car is                               c. ¼ g
         a. Zero                                              d. ½ g
         b. Directed forward in the direction of      99. If you change the tires on your car and
             travel                                       replace them with tires of a larger diameter,
         c. Directed towards the center of the            you will find that your speedometer will
             circle                                       show a speed that is
         d. Directed outward from the center of               a. Higher than it actually is
             the circle                                       b. Lower than it actually is
94. A huge rotating cloud of particles in space               c. Is correct
    gravitates together to form an increasingly               d. Not enough information
    dense ball. As it shrinks, the cloud              100. To kick a football so that it doesn’t topple
         a. Rotates faster                                end over end, kick it so that the force
         b. Rotates slower                                extends
         c. Rotates at the same speed                         a. Above its center of gravity
         d. Depends on how fast it contracts                  b. Below its center of gravity
95. If the polar ice caps melted, the resulting               c. Through its center of gravity
    water would be distributed evenly over the                d. As hard as you can
    area of the oceans. The length of a day
    would slightly
         a. Longer
         b. Shorter
         c. Stay the same
         d. Not enough information
96. Which will roll down a hill faster, an empty
    car tire, or an identical tire mounted on a
    rim?
         a. The mounted tire if the tire is heavier
             than the rim


                                                                                                       8
Physics: Review problems
101. If the mass of the Earth were somehow         108. Two objects move towards each other in
   increased by a certain amount with no              deep space because of their gravitational
   change in its radius, your weight would            attraction to each other. As the objects get
         a. Decrease by a proportional amount         closer together, their acceleration
         b. Decrease by the square of the amount          a. Increases
         c. Increase by a proportional amount             b. Decreases
         d. Increase by the square of the amount          c. Stays the same
102. If the radius of the Earth were somehow              d. Not enough information
   decreased by a certain amount with no           109. The force of gravity acts on all the apples
   change in its mass, your weight would              on an apple tree. Some apples are twice as
         a. Decrease by a proportional amount         high as others, but they are all essentially the
         b. Decrease by the square of the amount      same size. The twice-as-high apples have,
         c. Increase by a proportional amount         compared to the lower apples,
         d. Increase by the square of the amount          a. 1/4 the weight
103. Inside a free-falling elevator, there would          b. 1/2 the weight
   be no                                                  c. Twice the weight
         a. Gravitational force on you                    d. Practically the same weight
         b. Apparent weight for you                110. The planet Jupiter is about 300 times as
         c. Both of these                             massive as the Earth, yet on its surface you
         d. Neither of these                          would weigh only about 3 times as much.
104. The Earth’s gravitational field extends          This is because
         a. To the top of the atmosphere                  a. Your mass is 100 times less on
         b. Only on the outside of the Earth                  Jupiter
         c. To the edge of the solar system               b. Jupiter is significantly farther from
         d. Throughout the entire universe                    the Sun
105. Planets Yin and Yang are each of mass M              c. You are 10 times as far from the
   and separated by 1 AU. Planets Cheech and                  center of Jupiter
   Chong are each of mass 2M and separated                d. You are 100 times as far from the
   by 2 AU. The gravitational force between                   center of Jupiter
   Cheech and Chong is                             111. Half way to the center of a planet of
         a. The same as between Yin and Yang          uniform density, your weight compared to at
         b. Half that between Yin and Yang            the surface would be
         c. Twice that between Yin and Yang               a. 1/4
         d. 4 times that between Yin and Yang             b. 1/2
106. An object is placed exactly halfway                  c. 3/4
   between the Earth and the Moon. The                    d. The same
   object would fall toward the                    112. The reason the Moon does not fall into the
         a. Earth                                     Earth is because
         b. Moon                                          a. The Earth’s gravitational field is
         c. Sun                                               weak at the Moon
         d. None of these                                 b. The gravitational pull of other
107. The gravitational force on an astronaut at               planets keeps the Moon up
   the Earth’s surface is 500 N. In an orbiting           c. The Moon has sufficient tangential
   spacecraft that is one Earth-radius above the              velocity
   surface, the gravitational force on her is             d. The Moon has less mass than Earth
         a. 500 N
         b. 250 N
         c. 125 N
         d. 0 N
                                                                                                    9
Physics: Review problems
113. The Earth is presently accelerating towards    119. The fastest moving planet in a solar system
   the Sun (centripetal acceleration). If the sun      is the
   collapsed into a black hole, this acceleration            a. Least massive planet
   would                                                     b. Most massive planet
       a. Increase                                           c. Planet nearest the sun
       b. Decrease                                           d. Planet farthest from the sun
       c. Stay the same                             120. It takes Pluto a lot longer to travel around
       d. Cease to exist                               the Sun than the Earth does. This is because
114. A clever student wants to make a profit by              a. It has farther to go
   buying gold by weight at one altitude and                 b. It goes slower
   selling the same gold for the same price per              c. Both of these
   pound at a different altitude. The student                d. Neither of these
   should                                           121. A satellite in an elliptical orbit travels at
       a. Buy at a high altitude and sell low          constant
       b. Buy at a low altitude and sell high                a. Velocity
       c. Stay in school because this scheme                 b. Acceleration
            makes no sense                                   c. Both of these
115. Tidal forces in general are the result of               d. Neither of these
       a. Two or more sources of gravitation        122. A satellite for Dish Network hovers over a
       b. The inverse-square law                       fixed point on Earth’s equator. This can be
       c. Unequal fluid flow                           done because
       d. Unequal forces acting on different                 a. Forces other than Earth’s gravity are
            parts of a body                                     acting on it
116. During an eclipse of the Sun the high ocean             b. It pulls as hard on the Earth as the
   tides on Earth are                                           Earth pulls on it
       a. Higher than average                                c. It is kept aloft by ground control
       b. Lower than average                                 d. Its orbital period is 24 hours
       c. Not appreciably different than            123. From Earth, one satellite appears to
            average                                    overtake another in the sky. This is due to
       d. Absent since the moon is blocking                  a. The faster satellite is higher in orbit
            the Sun                                          b. The faster satellite is lower in orbit
117. The Earth is slightly closer to the sun in              c. The faster satellite has greater mass
   January than July. In the northern                        d. An optical illusion
   hemisphere, the highest high tides are in the    124. Angular momentum is conserved for a
       a. Winter                                       satellite in
       b. Spring                                             a. A circular orbit
       c. Summer                                             b. And elliptical orbit
       d. Fall                                               c. Both of these
118. The circular orbit of a satellite is                    d. Neither of these
   characterized by constant                        125. A rocket coasts in an elliptical orbit about
       a. Speed                                        the Earth. Firing its engine burns fuel at a
       b. Acceleration                                 constant rate and exerts a constant force. It
       c. Radial distance                              can attain escape velocity using the least
       d. All of these                                 amount of fuel by firing the engine [hint:
                                                        F ! d = ! KE ]
                                                             a. When closest to Earth
                                                             b. When farthest from Earth
                                                             c. It will use the same amount of fuel
                                                                anywhere in its orbit
                                                                                                    10
Physics: Review problems
Answers
Problem Set #1             44. D            87. B
1. A                       45. A            88. A
2. A                       46. C            89. A
3. C                       47. C            90. B
4. D                       48. B            91. D
5. D                       49. C            92. A
6. B                       50. B            93. C
7. D                       Problem Set #2   94. A
8. C                       51. C            95. A
9. B                       52. B            96. D
10. C                      53. C            97. C
11. A                      54. C            98. A
12. C                      55. D            99. B
13. B                      56. D            100. C
14. A                      57. B            Problem Set #3
15. C                      58. D            101. C
16. C                      59. B            102. D
17. B                      60. D            103. B
18. B                      61. B            104. D
19. C                      62. C            105. A
20. C                      63. C            106. A
21. A                      64. B            107. C
22. B                      65. C            108. A
23. C                      66. C            109. D
24. D                      67. B            110. C
25. D                      68. B            111. B
26. A                      69. C            112. C
27. C                      70. B            113. C
28. A                      71. C            114. A
29. A                      72. B            115. D
30. C                      73. B            116. A
31. C                      74. D            117. A
32. D                      75. A            118. D
33. C                      76. B            119. C
34. C                      77. D            120. C
35. C                      78. A            121. D
36. D                      79. B            122. D
37. B                      80. D            123. B
38. D                      81. D            124. C
39. C                      82. B            125. A
40. C                      83. A
41. A                      84. C
42. A                      85. A
43. C                      86. B
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