Question

An aeroplane is flying with a velocity U_p. The plane takes in volume V of air of mass μ. per second to burn mass m of fuel every second. The exhaust relative to plane has a speed of U_E. b.h.p. of engine of the aeroplane is

• A.
• B.
• C.
• D. $\frac { \mathrm { U } _ { \mathrm { P } } ^ { 2 } ( \mu + \mathrm { m } ) - \mathrm { U } _ { \mathrm { p } } \mathrm { U } _ { \mathrm { E } } ( \mu - \mathrm { m } ) } { 746 }$

Answer 1

Answer: (C)

Answer 2

The resultant force = forward thrust – backward thrust and forward thrust = U_E × (μ + m)

Backward thrust = U_P × μ

∴ Resultant thrust,

F = U_E(μ + m) – U_Pμ

Power = F × v

=

=