When its 115-kW (154.1-hp) engine is generating
full power, a small single-engine airplane with mass
685 kg gains altitude at a rate of 3.0 m/s (180
m/min, or 590.4 ft/min). What fraction of the engine power
is being used to make the airplane climb? (The remainder is used to
overcome the effects of air resistance and of inefficiencies in the
propeller and engine.)
Power = F.v
F = mg = 685g
Power = 685 x 9.8 x 3 =20139 W = 20.14 kW
fraction of power used = 20.14 / 115 = 0.175
When its 115-kW (154.1-hp) engine is generating full power, a small single-engine airplane with mass 685...
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