A small motor draws 120 J of electrical energy from the mains to lift a book of mass 1 kg through a vertical distance of 8.0 m. It takes 5 s to do this. Calculate: (c) the fraction of the input power that is wasted.
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A small motor draws 120 J of electrical energy from the mains to lift a book of mass 1 kg through a vertical distance of 8.0 m. It takes 5 s to do this.
Calculate:
(c) the fraction of the input power that is wasted.
Step by step
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