Question

Listen Two construction cranes are used to lift identical 1200-kilogram loads of bricks the same vertical distance. The first crane lifts the bricks in 20. seconds and the second crane lifts the bricks in 40. seconds. Compared to the power developed by the first crane, the power developed by the second crane's the same twice as greathalf as greatfour times as great?

Answer 1

Answer:

The power developed by the 1st crane is twice the power developed by the 2nd crane.

Step-by-step explanation:

According to the question,

work done by both of the cranes are the same. Let it be W.

Then power developed by the first crane,

= $P_{1} = \frac {W}{20}$ unit -----------------(1)

and, the power developed by the 2nd crane,

= $P_{2} = \frac {W}{40}$ unit ------------------(2)

So, we get that,

$P_{2} = \frac {P_{1}}{2}$

So, the power developed by the 1st crane is twice the power developed by the 2nd crane.