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An engine develops 10 kW of power. How much time will it take to lift a mass of 200 kg to a height of 40 m? (g = 10m/s2)
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a
4s
b
5s
c
8s
d
10s
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Correct option is C
t=WdWdt=mghP=200×10×4010×103=8 s.Similar Questions
The heart of a man pumps 5 litres of blood through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury be then the power of heart in watt is:
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