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A machine rated as 150W, changes the velocity of a 10kg mass from 4ms–1 to 10ms–1 in 4s. The efficiency of the machine nearly is
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Correct option is A
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Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. It losses 10% of energy due to frictional forces . How much power is generated by the turbine?
(g = 10 )
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