Q.

A box of books that weighs 40 N is dragged at a speed of 1.5 m/s across a rough floor. If the coefficient of friction between the floor and the box is A.20, what is the rate at which heat energy is dissipated?

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a

5.3 w

b

12 W

c

60 W

d

300 w

answer is B.

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Detailed Solution

P=(μmg)v=0.2×40×1.5=12W
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