Question

A jet air plane is travelling at $200m/s$. The engine of the plane takes in $250m^3$ of air having mass $32kg$ each second. The air is used to burn $3kg$ of fuel each second. The energy is used to compress the products of combustion to eject then at the rear of the plane at $500m/s$ relative to the plane. Find the power of the jet plane.

Answer 1

Net force on the plane= force due to incoming air+force due to exhaust.

$F=32\times 200+3\times 500$

$P=F.V=(6400+1500)200watt=1580000watt$