Multiple Choice
A 200 W vacuum cleaner is powered by an electric motor whose efficiency is 70%. (Note that the electric motor delivers 200 W of net mechanical power to the fan of the cleaner) . The rate at which this vacuum cleaner supplies energy to the room when running is
A) 140 W
B) 200 W
C) 286 W
D) 360 W
E) 86 W
Correct Answer:
Verified
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