First slide

Power

Question

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?

Easy

A

5.3 w
B

12 W
C

60 W
D

300 w

Solution

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

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