Share

## A 193 kg curtain needs to e raised 7.5 m, at constant speed, in as close to 5.0 s as possible. The power ratings for three motors are listed

Question

A 193 kg curtain needs to e raised 7.5 m, at constant speed, in as close to 5.0 s as possible. The power ratings for three motors are listed as 1.0 kW, 3.5 kW, and 5.5 kW. Which motor is best for the job?

in progress
0

Physics
3 years
2021-08-09T17:17:59+00:00
2021-08-09T17:17:59+00:00 1 Answers
203 views
0
## Answers ( )

Answer:best motor for above purpose is 3.5 kW

Explanation:As we know that power is defined as the rate of work done

Here we have to raise the curtain so work is done against gravity

So we have

W = mgH

here we know

m = 193 kg

Now we have

now power used in it

So best motor for above purpose is 3.5 kW