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

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

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0i got Pavg = 1.6 MW but the answer shuld be 4.2 MW

VincentLyon.Fr
 4 years ago
Best ResponseYou've already chosen the best response.2You have forgotten the gain in gravitational potential energy.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0We have Consider P.E here ?

VincentLyon.Fr
 4 years ago
Best ResponseYou've already chosen the best response.2Of course! How could you raise the altitude of the plane without providing energy?!

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Yup...i got..it...thx..)

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

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Is it then mgh+delta K.E /t ?

VincentLyon.Fr
 4 years ago
Best ResponseYou've already chosen the best response.2You 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

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