Question

Energy dissipated by the machine in one second is 1100 ft-lb. its power will be
(a) 1
(c) 2hp
(d) 746 watt
(correct answer is b why?)
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Answer 1

Given ,

• Energy dissipated by machine = 1100 ft-lb
• Time taken = 1 sec

Formula for power

• Power = Energy / Time
• Power = 1100 ftlb / 1 Sec.

As 1 hp = 550 foot pounds per second

So,

• 1100 fflb / sec
• = 1100 / 550 hp

Thus , Power = 2 hp