A rocket vents exhaust gases with 0001 lbmft3 through a 20 i

A rocket vents exhaust gases with =0.001 lbm/ft³ through a 20 in diameter nozzle at a velocity of 4000 ft/sec. What is most nearly the thrust due to the exhaust?

Solution

Exhaust thrust = mass * velcity

=0.001*(pi*(20/12)²/4)*4000*32.2*1.587

=500 Lbf

Option A is correct.