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51. A 50-N crate pulled up a 5-m inclined plane
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# Question :   51. A 50-N crate pulled up a 5-m inclined plane : 2102109

51. A 50-N crate is pulled up a 5-m inclined plane by a worker at constant velocity. If the plane is inclined at an angle of 37? to the horizontal and there exists a constant frictional force of 10 N between the crate and the surface, what is the force applied by the worker?

A. zero

B. 20 N

C. 30 N

D. 40 N

52. Adisa pulls a 40-N crate up a 5.0-m long inclined plane at a constant velocity. If the plane is inclined at an angle of 37? to the horizontal and there is a constant force of friction of 10 N between the crate and the surface, what is the net change in potential energy of the crate?

A. 120 J

B. -120 J

C. 200 J

D. -200 J

53. A 20-N crate starting at rest slides down a rough 5.0-m long ramp, inclined at 25? with the horizontal. 20 J of energy is lost to friction. What will be the speed of the crate at the bottom of the incline?

A. 0.98 m/s

B. 1.9 m/s

C. 3.2 m/s

D. 4.7 m/s

54. Preston pushes a wheelbarrow weighing 500 N to the top of a 50.0-m ramp, inclined at 20.0? with the horizontal, and leaves it. Tamara accidentally bumps the wheelbarrow. It slides back down the ramp, during which an 80.0-N frictional force acts on it over the 50.0 m. What is the wheelbarrow's kinetic energy at the bottom at of the ramp? (g = 9.8 m/s2)

A. 4 550 J

B. 6 550 J

C. 8 150 J

D. 13 100 J

55. A pile driver drives a post into the ground. The mass of the pile driver is 2 500 kg and it is dropped through a height of 8.0 m on each stroke. If the resisting force of the ground is 4.0 ´ 106 N, how far is the post driven in on each stroke?

A. 4.9 cm

B. 9.8 cm

C. 16 cm

D. 49 cm

## Solution 5 (1 Ratings )

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Physics 1 Year Ago 87 Views