# college physics

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A rope is used to pull a 3.57 kg block at constant speed 5.10 m along a horizontal floor. The force on the block from the rope is 6.82 N and is directed 15° above the horizontal.

(a)What is the work done by the rope's force?

(b) What is the increase in the thermal energy of the block-floor system?

(c) What is the coefficient of kinetic friction between the block and floor?

• college physics -

a) 6.82N * cos 15 * 5.1 m = ___ Joules
b) The same, since KE does not increase
c) 6.82 cos15/(M g) = 0.188

• college physics -

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