A rope is used to pull a 5.87 kg block at constant speed 3.36m along a horizonta

Question

A rope is used to pull a 5.87 kg block at constant speed 3.36m along a horizontal floor. The force on the block from the rope is4.44 N and directed 34.2° above the horizontal. What are(a) the work done by the rope's force,(b) the increase in thermal energy of theblock-floor system, and (c) the coefficient ofkinetic friction between the block and floor? I have part A and B but need part C. The answer for A is the same as B which is 12.39 J. A rope is used to pull a 5.87 kg block at constant speed 3.36m along a horizontal floor. The force on the block from the rope is4.44 N and directed 34.2° above the horizontal. What are(a) the work done by the rope's force,(b) the increase in thermal energy of theblock-floor system, and (c) the coefficient ofkinetic friction between the block and floor? I have part A and B but need part C. The answer for A is the same as B which is 12.39 J.

Explanation / Answer

The force horizontal being pulled must equal the frictionalforce since it is being pulled at constant speed. F(applied) = Ff F(cos ) = Fn where Fn = mg - F(sin ) 4.44N (cos 34.2) = [(5.87 *9.8m/s2) - 4.44Nsin34.2] 3.67N = 55.03N 3.67/55.03 = 0.067 Hope that helps

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