# Homework Help - Physics / Calculus III / Force-Work Problem [closed]

I have tried to answer the problem correctly, and I have found similar (and even an identical) problem in my textbook, yet I still can't seem to yield the correct answer with this specific problem.

The example problem in my textbook: A crate is hauled 8m up a ramp under a constant force of 200 N applied at an angle of 25 degrees to the ramp. Find the work done. W = F * D cos(25) = (200)(8)cos(25) = 1450J.

Can anyone give me any advice on how to solve it?

A woman exerts a horizontal force of 4 pounds on a box as she pushes it up a ramp that is 5 feet long and inclined at an angle of 30 degrees above the horizontal.

Find the work done on the box.

I would think that the work would simply be (4)(5)cos(30), but that is not the correct answer.

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## closed as off-topic by Qmechanic♦Nov 3 '13 at 2:25

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Note that in one case the angle is given with respect to the ramp and in the other with respect to the horizontal. Compare to the definition of work. – dmckee Jan 31 '11 at 19:57
Also, note that the question says 'work done on the box' not work supplied to the box by the 'man/woman'. Though this is a distinction that question writers get lazy about. – Jerry Schirmer Jan 31 '11 at 23:26