Sarthaks Test
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Define watt. Express kilowatt in terms of joule per second. A 150 kg car engine develops 500 W for each kg. What force does it exert in moving the car at a speed of 20 m s–1?

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1 Answer

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One watt is the power of an agent which does work at the rate of 1J s–1 

1 kilowatt = 1000 J s–1 

Total Power = 150 × 500 = 7.5 × 104

Force = Power /velocity = 4 7.5 ×104 /20 = 3.75 ×103 N  

Force = 3750 N.

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