Question

Bill and Nageen have each built an electric motor and they are testing them by having them lift boxes. Bill's motor lifts a box 0.39 metres in 2 seconds. Nageen's motor lifts the same box 0.35 metres in 2 seconds. Whose motor has applied more power to the box?

Answer 1

Answer:

Bill's motor

Explanation:

Bill's motor lifts a box 0.39 metres in 2 seconds.

Nageen's motor lifts the same box 0.35 metres in 2 seconds.

Power = Work done/time

or

$P=\dfrac{mg\times h}{t}$

Power of bill's motor,

$P_1=\dfrac{m\times 9.8\times 0.39}{2}\\\\P_1=1.91m\ Watts$

Power of Nageen's motor,

$P_2=\dfrac{m\times 9.8\times 0.35}{2}\\\\P_2=1.71m\ Watts$

So, Bill's motor applied more power to the box.