Related Practice Questions :

An ice cream has a marked value of 700 kcal. How many kilowatt- hour of energy will it deliver to the body as it is digested 

(1) 0.81 kWh

(2) 0.90 kWh

(3) 1.11 kWh

(4) 0.71 kWh

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A body of mass m accelerates uniformly from rest to v1 in time t1. As a function of time t, the instantaneous power delivered to the body is 

(1) mv1tt1

(2) mv12tt1

(3) mv1t2t1

(4) mv12tt12

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A weight lifter lifts 300 kg from the ground to a height of 2 meter in 3 second. The average power generated by him is 

(1) 5880 watt

(2) 4410 watt

(3) 2205 watt

(4) 1960 watt

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The average power required to lift a 100 kg mass through a height of 50 metres in approximately 50 seconds would be 

(1) 50 J/s

(2) 5000 J/s

(3) 100 J/s

(4) 980 J/s

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The power of a pump, which can pump 200kg of water to a height of 200m in 10sec is (g = 10 m/s2) 

(1) 40 kW

(2) 80 kW

(3) 400 kW

(4) 960 kW

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