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Question

Physics Question on Power

An electric motor exerts a force of 40 N on a cable and pulls it by a distance of 30 m in one minute. The power supplies by the t motor will be:

A

20 watt

B

200 watt

C

2 watt

D

10 watt

Answer

20 watt

Explanation

Solution

Work done = Force ×\times Distance =40×30=1200 J=40\times 30=1200\,J Using the formula for power P=work donetime=120060=20  wattP=\frac{\text{work}\,\text{done}}{\text{time}}=\frac{1200}{60}=20\,\,\text{watt}