Questions
The power (P) of an engine lifting a mass of 100 kg up to a height of 10m in 1 min is [J&K CET 2013)
a
163.3 W
b
9800 W
c
10000 W
d
5000 W
detailed solution
Correct option is A
Power = Work done Time Work done =mgh=100×9.8×10Time = 1 min = 60 s∴ P=100×9.8×1060=163.3 WTalk to our academic expert!
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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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