Question

It takes 8 seconds for a pulley system to lift a load that weights 400N to a height of 10 m. How much power is required?.

A. 400 watts.

B. 3200 Watts.

C. 500 watts.

D. 80 watts

Answer 1

C. 500 watts

Step-by-step explanation:

power is defined as the rate of work done

`power=(work.done)/(time)`

When a force causes a object to move, work is being done on the object by the force.

`work.done=force*displacement\\=400*10\\=4000J`

`power=(4000J)/(8s)\\=500 W`