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# which of the following has the largest momentum relative to

### Resolved Question:

which of the following has the largest momentum relative to earth?
a pickup truck speeding along a highway
the science building on campus
a tightrope walker crossing Niagara falls
a dog running down the street
a mack truck parked in a parking lot.
2.      a rifle recoils while firing a bullet. The spped of the rifle’s recoil is small because

a.      rifle has much more mass than the bullet

b.      momentum of the rifle is smaller

c.      momentum is mainly concentrated in the bullet

d.      force against the rifle is smaller than against the bullet

3.      in order to catch a ball, a baseball player extends the hand forward before impact with the ball and then lets it ride backward in the direction of the ball’s motion…Doing this reduces the force of impact on the player’s hand principally because the

a.      time of impact is increased

b.      time of impact is decreased

c.      relative velocity is less

d.      force of impact is reduced

e.      none of these

4.      padded dashboards in cars are safer in an accident that nonpadded ones because of occupant hitting the dash has

a.      increased time of impact

b.      increased momentum

c.      decreased impulse

d.      decreased time of impact

5.      A 4 kg ball has momentum of 12kg m/s. what is ball’s speed?

a.      4m/s

b.      48 m/s

c.      3 m/s

d.      12 m/s

e.      none of these

6.      a 1-kg chunk of putty moving at 1m/s collides with and sticks to a 5-kg bowling ball initially at rest. The bowling ball and putty then move with a momentum of

a.      5 kg m/s

b.      0 kg m/s

c.      1 kg m/s

d.      2 kg m/s

e.      more than 5 kg m/s

7.      two billiard balls having the same mass and speed roll toward each other. What is their combined momentum after they meet?

a.      0

b.      twice the sum of their original momentums

c.      half the sum of their original momentums

d.      impossible to determine without additional information

8.      an astronaut, floating alone in outer space, throws a baseball. If the ball floats away at a speed of 20 meters per second, the astronaut will

a.      move in the opposite direction at a speed of 20 m/s

b.      move in the opposite direction but at a higher speed

c.      move in the opposite direction, but at a lower speed

d.      not move as stated in any of a the above choices

9.      a 5000-kg freight car moving a 2 m/s runs into a 10,000-kg freight car at rest. They couple upon collision and move away as one body at

a.      1 m/s

b.      1/3 m/s

c.      2 m/s

d.      2/3 m/s

10. the change in momentum, in kg m/s, that occurs when a 1.0 kg ball traveling at 4.0 m/s strikes a wall and bounces back at 2.0 m/s is

a.      6

b.      4

c.      8

d.      2

11. if you push for a half hour aor a whole hour against a stationary wall

a.      twice as much work is done during the half hour

b.      half as much work is done during the half hour

c.      no work is done in either case

d.      it is impossible to determine how much work is done

12. if you push an object twice as far while applying the same force, you do

a.      four times as much work

b.      half as much work

c.      twice as much work

d.      the same amount of work

13. a job isdone slowly, while an identical job is done quickly. Both jobs require the same amount of work, but different amounts of

a.      power

b.      energy

c.      effort

d.      none of these

14. do 100 J of work in 50 s and your power output is

a.      4w

b.      5,000w

c.      2w

d.      50w

e.      1/2w

15. a 1000-kg car and a 2000-kg car are hoisted the same distance. Raising the more massive car requires

a.      as much work

b.      less work

c.      twice as much work

d.      four times as much work

e.      more than four times as much work

16. an object that has kinetic energy must be

a.      at rest

b.      falling

c.      moving

d.      at an elevated position

e.      none of these

17. an obhect may have poteneial energy because of its

a.      at rest

b.      momentum

c.      acceleration

d.      location

e.      none of these

18. a bow is drawn so that it has 40 J of potential energy. When fired, the arrow will ideally have kinetic energy that is

a.      less than 40 J

b.      40 J

c.      more than 40 J

d.      impossible to predict without additional information

19. a ball rolling down an incline has its maximum kinetic energy at

a.      the bottom

b.      halfway down

c.      the top

d.      three-quarters of the way down

20. a tv set is pushed a distance of 2 m with a force of 20 n. how much work is done on the set?

a.      20j

b.      40j

c.      800j

d.      2j

e.      10j

21. a 2 kg mass has 40j of potential energy with respect to the ground. Approximately how high is it above the ground?

a.      1m

b.      2m

c.      3m

d.      4m

e.      none of these

22. a car moves 4 times as fast as another identical car. Compared to the slower car, the faster car has

a.      16 times the KE

b.      4 times the KE

c.      12 times the KE

d.      8 times the KE

23. a machine puts out 100 watts of power for every 1000 watts put into it. The efficiency of the machine is

a.      110%

b.      50%

c.      10%

d.      90%

e.      none of these

24. a diver who weighs 500n steps off a diving board that is 10 m above the water. The diver hits the water with kinetic energy of

a.      10j

b.      500j

c.      5000j

d.      more than 5000j

e.      510j

25. a 2500-N pile-driver ram falls 10m and drives a post 0.1 m into the ground. The average impact force on the ram is

a.      250000 n

b.      2,500,000 n

c.      25,000n

d.      2500n

26. horses that move with the fastest linear speed on a merry-go-round are located

a.      near the outside

b.      near the center

c.      anywhere, because they all move at the same speed

27. an upright broom is easier to balance when the heavier end is

b.      highest, farthest from your hand

c.      same either way

28. a coin and ring roll down an incline starting at the same time. The one to reach the bottom first will be the

a.      coin

b.      ring

c.      both reach the bottom at the same time

29. the rotational inertia of your leg is greater when your leg is

a.      straight

b.      bent

c.      same either way

30. a torque acting on an object tends to produce

a.      a center of gravity

b.      linear motion

c.      equilibrium

d.      velocity

e.      rotation

31.on a balanced wee saw, a boy three times as heavy as his partner sits

a.      less than 1/3 the distance from the fulcrum

b.      1/3 the distance from the fulcrum

c.      more than 1/3 the distance from the fulcrum

32. put a pipe over the end of wrench when trying to turn a stubborn nut on a bolt, to     effectively make the wrench handle twice as ling, you’ll multiply the torque by

f.        four

g.      eight

h.      two

33.    the famous leaning tower of pisa doesn’t topple over because its center of gravity is

a.      displaced from its center

b.      relatively low for such a tall building

c.      above a place of support

d.      stablilized by its structure

e.      in the same place as its center of mass

34.    when a twirling ice skater brings her arms inward, her rotational speed

a.      remains the same

b.      increases

c.      decreases

35.    a ball rolls down a hill mainly because of

a.      an unbalanced torque

b.      a balanced torque

c.      its angular acceleration

d.      its angular momentum

e.      its rotational inertia

36.    according to Newton, the greater the masses of interacting objects, the

a.      greater the force between them by the square of the masses

b.      less the gravitational force between them

c.      greater the gravitational force between them

37.    according to Newton, doubling the distance between two interacting objects

a.      multiplies by 4 the gravitational force between them

b.      multiplies by 2 the gravitational force between them

c.      divides by 2 the gravitational force between them

d.      divides by 4 the gravitational force between them

38.    which is most responsible for the ocean tides?

a.      the sun

b.      the moon

c.      both contribute equally

39.    the main reason ocean tides exist is the pull of the moon

a.      and the sun of the oceans are in opposite directions

b.      is greater on the earth because the moon is closer to earth

c.      is greater on oceans closer to the moon and less on oceans farther from the moon

d.      and the sun are in conjunction at high tides and in opposition at low tieds

e.      none of these

40.    suppose the moon had twice as much mass as it now does and still orbited the earth at the same distance. In that case, the ocean bulges on earth would be

a.      not significantly different

b.      larger

c.      smaller

d.      unequal in size

e.      none of these

41.    a rock is thrown upward at 50 degrees with respect ot the horizontal. As it rises, its vertival component of velocity

a.      remains unchanged

b.      decreases

c.      increases

42.    a rock is thrown upward at 50 degrees with respect ot the horizontal. As it rises, its horizontal component of velocity

a.      remains unchanged

b.      decreases

c.      increases

43.    a stone is thrown horizontally from the top of a cliff. One second after it has left your hand its vertical distance below the top of the cliff is

a.      5m

b.      15m

c.      10m

44.    a bullet fired horizontally from a rifle begins to fall

a.      as soon as it leaves the barrel

b.      after air friction reduces its speed

c.      neither of these

45.    a bullet fired horizontally over level ground hits the ground in 0.5 decond. If it had been fired with twice the speed in the same direction, it would have hit the ground in

a.      less than 0.5s

b.      0.5s

c.      more than 0.5s

46.    a gun with a muzzle velocity of 100 m/s is fired horizontally form a tower. Neglecting air resistance, how far downrange will the bullet be 1 second later?

a.      50m

b.      490

c.      98

d.      100

e.      none of these

47.    two projectiles are fired from ground level at equal speeds but different angles. One is fires at an angle of 30 degrees and the other at 60 degrees. The projectile to hit the ground first will be the one fired at ( neglect air resistance)

a.      60 degrees

b.      30 degrees

c.      both hit at the same time

48.    a projectile is fired vertically from the surface of the earth at 8km/s. the projectile will

b.      rise and fall back to earth’s surface

c.      escape from earth

d.      to into circular orbit about the earth

49.    a ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation of 5m above the grond. The player sees the ball alnd 20m down range. What is the player’s pitching speed?

e.      none of above

50.    an airplane flies at 40 m/s at an altitude of 50 meters. The pilot drops a heavy package which falls to the ground. Where, approximately, does the package land relative to the plane’s new position?

a.      500m behind the plane

b.      400m behind the plane

c.      more than 500m behind the plane

d.      beneath the plane

e.      none of these

51.    a bullet is fired horizontally with an initial velocity of 300 m/s from a tower 20 m high. If air resistance is negligibl, the horizontal distance the bullet travel before hitting the ground is about

a.      500m

b.      200m

c.      400m

d.      600m

e.      300m

52.    minimal orbit speed about the earth is about 8 km/s. minimal orbital speed about Jupiter would be