Question

A medium-sized jet has a 3.8-m-diameter fuselage and a loaded mass of 85,000 kg. The drag on an airplane is primarily due to the cylindrical fuselage, and aerodynamic shaping gives it a drag coefficient of 0.37. How much thrust must the jets engines provide to cruise at 260 m/s at an altitude where the air density is 1.7 kg/m^3? Express your answer with the appropriate units.

Answer 1

Answer:

$2.4\times 10^{5} N$

Explanation:

The force of drag is given by

$F= 0.5 C\rho Av^{2}$

C is coefficient of drag

$\rho$is density of air

A is area which is given by $\frac {\pi d^{2}}{4}$

V is the velocity

$F= 0.5*0.37*1.7\times \frac {\pi 3.8^{2}}{4}\times 260^{2}=2.4\times 10^{5} N$