Questions
If two persons A and B take 2 s and 4 s respectively to lift an object to the same height h, then the ratio of their powers is [Kerala CEE 2014)
detailed solution
Correct option is C
Given, t1=2 s,t2=4 s and h1=h2=hAs, PA=mgh1t1 …(i)and PB=mgh2t2 …(ii)On dividing Eq. (i) by Eq. (ii), we getPA:PB=mgh1/t1mgh2/t2=h1h2t2t1=t2t1=42=21 ∵h1=h2⇒PA:PB=2:1Talk to our academic expert!
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