A 310 kg piano slides 4.3 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40.

(a) Calculate the force exerted by the man.
303.8

N
(b) Calculate the work done by the man on the piano.

J
(c) Calculate the work done by the friction force.
J
(d) What is the work done by the force of gravity?
J
(e) What is the net work done on the piano?

Question

A 310 kg piano slides 4.3 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40.

(a) Calculate the force exerted by the man.
303.8 

 N
(b) Calculate the work done by the man on the piano.
  

 J
(c) Calculate the work done by the friction force.
  J
(d) What is the work done by the force of gravity?
  J
(e) What is the net work done on the piano?

anonymous · Answer

b. Work is equal to the force multiplied by the displacement...