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An automobile is moving at 100 kmph and ...

An automobile is moving at `100 kmph` and is exerting attractive force of `3920 N`. What horse power nust the engine develop, if `20 %` of the power developed is wasted ?

Text Solution

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Velocity ` = 100 kmph = 100 xx (5)/(18) m//s`
Force `= 3920 N` ,, Useful power `= 80 %`
Power `= (W)/(t) = (F.S)/(t) = F.v rArr (80)/(100) P = 3920 xx 100 xx (5)/(18)`
`P = (100)/(80) xx 3920 xx 100 xx (5)/(18) = 13.16 xx 10^(4) W = 182.5 hp`.
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