Question

A crane A lifts a heavy load in 5 seconds, where another crane B does the same work in 2 seconds. Compare the power of crane A to that of crane B​

Answer 1

*Answer:-

5 : 2......

Short answer ⤵️

PA/ PB = WA / tA ÷ WB / tB

∴ PA /PB = WA /tA × tB / WB

but WA = WB ∴ PA / PB = tB / tA

∴ PA: PB = 5 : 2

*Answer:-

5:2.......

Long method ⤵️

We know that,

• Power = work done/ time

Here the work done is same. That is . W.(let)

So for crane A,

• Power P(A) = W/5

So for crane B,

• Power P(B) = W/2

Now,

• P(A)/P(B) = (W/5)/(W/2)
• P(A)/P(B) = 2/5.

So your final answer is 2/5......

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