56. (a) The force of the worker on the crate is constant, so the work it does is given by WFdFdF=⋅=GGcosφ, where GFis the force, Gdis the displacement of the crate, and is the angle between the force and the displacement. Here F= 210 N, d= 3.0 m, and = 20°. Thus,WF= (210 N) (3.0 m) cos 20° = 590 J. (b) The force of gravity is downward, perpendicular to the displacement of the crate. The
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This note was uploaded on 03/19/2010 for the course PHYSICS 191262 taught by Professor Najafzadeh during the Spring '09 term at The Petroleum Institute.