1.
The power output of a machine that lifts a 600 kg weight
through a height of 20 m in 1 minute is :
(a) 1.96 kW
(b) 0.98 kW
(c) 12 kW
(d) 3.92 kW
Answers
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10
Answer:
- c is correct b/c
P=W/t
since W=P.E=mgh
so:
P=mgh/t
Given :
- m=600kg,
- h=20m
- t=1min=60sec
- P=? in kw
- g=9.8m/s (gravity)
P=600×9.8×20/60
P=19600w
P=1.96kw
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