Sally applies ahorizontal force of 519 N with a rope to drag a wooden crate acro

Question

Sally applies ahorizontal force of 519 N with a rope to drag a wooden crate acrossa floor with a constant speed. The rope tied to the crate is pulledat an angle of 56? relative to the floor.
The acceleration of gravity is 9.8 m/s2 . How much force is exerted by the rope on the crate? Answerin units of N. (part 2 of 3)
What work is done by Sally if the crate is moved59.3 m? Answerin units of J. (part 3 of 3)
What work is done by the floor through force of friction betweenthe floor and the crate? Answer in units of J.

Explanation / Answer

Horizontal force F= 519 N
The rope tied to the crate is pulled at an angle = 56 degrees
The acceleration of gravity g = 9.8m/s2
Force is exerted by therope on the crate F ' = F / cos
                                                                   = 928.13 N
(2) work is done bySally if the crate is moved 59.3 m is W = F .S = 30776.7J
where S = displacement = 59.3 m (3). work is done by thefloor through force of friction between the floor and thecrate = 30776.7 J Since it moves with constan tvelocity               

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