Question

calculate the power need by a crame to raise a 520 kg billboard to a height of 25 min in 3 minutes.

Answer 1

Answer:

Power =707.78W

Explanation:

As we know that power =work/time

First we will calculate the work done.

Work done =change in potential energy

Work done =mgh

Work done =(520kg) (9.8m/s^2)(25m)

Work done =127400J

As this needs to be done in 3min i.e 3×60=180s

power =work/time

Power =127400/180

Power =707.78W is needed.

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Answer 2

707.78 joules power is needed

Hope the answer helps you