1.

Two men with weights in the ratio 4:3 run up a staircase in time in the ratio 12:11. The ratio of power of the first to that of second is

Answer»

`4/3` 
`12/11`
`48/33`
`11/9` 

Solution :POWER = `("work")/("TIME")= ("energy")/("time") = (MGH)/(t) = (Wh)/(t) `
(W = WEIGHT = mg)
`:. (P_1)/(P_2) = (W_1)/(W_2) xx (t_2)/(t_1) = 4/3 xx 11/12 = 11/9` (h is the same in both CASES) .


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