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A 25000 Kg airplane takes off from rest and reaches 5000m altitude and cruises at 900km/h in 8 minutes .Find Avg Power ?
 one year ago
 one year ago
A 25000 Kg airplane takes off from rest and reaches 5000m altitude and cruises at 900km/h in 8 minutes .Find Avg Power ?
 one year ago
 one year ago

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Yahoo!Best ResponseYou've already chosen the best response.0
My Work: Pavg = W/t W = Delta K.E W = 25000 * 250*250 / 2 t = 8 * 60
 one year ago

Yahoo!Best ResponseYou've already chosen the best response.0
i got Pavg = 1.6 MW but the answer shuld be 4.2 MW
 one year ago

VincentLyon.FrBest ResponseYou've already chosen the best response.2
You have forgotten the gain in gravitational potential energy.
 one year ago

Yahoo!Best ResponseYou've already chosen the best response.0
We have Consider P.E here ?
 one year ago

VincentLyon.FrBest ResponseYou've already chosen the best response.2
Of course! How could you raise the altitude of the plane without providing energy?!
 one year ago

Yahoo!Best ResponseYou've already chosen the best response.0
Yup...i got..it...thx..)
 one year ago

Yahoo!Best ResponseYou've already chosen the best response.0
but @VincentLyon.Fr we knw change in K.E is Work Done..Why cant we Use it here..)
 one year ago

haridas_mandalBest ResponseYou've already chosen the best response.0
Is it then mgh+delta K.E /t ?
 one year ago

VincentLyon.FrBest ResponseYou've already chosen the best response.2
You can, but there are two works to take into account:  motive work by the engine (positive)  negative work by the weight so change in KE = Wengine  Mgh or W engine = change in KE + change in PE
 one year ago

VincentLyon.FrBest ResponseYou've already chosen the best response.2
I see you are now getting to the energy concept. Soon you will be able to solve problems of mechanics by this method.
 one year ago
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