Reference no: EM132583553

Brad Pitt and Leonardo DiCaprio are cleaning up a movie set. Brad Pitt wants to move a 138.9-kg box onto a moving truck 1.9 m off the ground. (PQYHZFXRKQ).

a) If the box is lifted straight up by Brad Pitt and Leonardo DiCaprio (very strong people), how much force must they apply?

b) How much work have Brad Pitt and Leonardo DiCaprio done lifting the piano onto the truck?

c) If the Brad Pitt and Leonardo DiCaprio only need to apply a force of 389 N to get the piano onto the truck when they use a 13-m long ramp. How much work is done using the ramp?

d) What is the efficiency of the ramp?

e) You should notice that the force needed to life the box in a) is larger than the force needed to lift the box in c). How is it possible that the box can be raised with much less force when the incline is used? (In other words, what is the "trade-off" of using an inclined ramp?)