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  51. A 50-N crate pulled up a 5-m inclined plane

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 ยด 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
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