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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 $μ =$ 0.2, what is the rate at which heat energy is dissipated?

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5.3 W

12 W

60 W

300 W

answer is B.

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Detailed Solution

$P = (μmg) v = 0 .2 \times 40 \times 1 .5 = 12 W$

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