Question

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​

Answer 1

Answer:

• c is correct b/c

P=W/t

since W=P.E=mgh

so:

P=mgh/t

Given :

1. m=600kg,
2. h=20m
3. t=1min=60sec
4. P=? in kw
5. g=9.8m/s (gravity)

P=600×9.8×20/60

P=19600w

P=1.96kw