Question

Fuel is consumes at the rate of 100kg/s in a rocket. The exhaust gases are ejected at speed of 4.5×10^4m/s. What is the thrust experienced by the rocket?

(a) 3.19×10^6N

(b) 4.5N

(c) 3.19N

(d) 4.5×10^6N

Answer 1

Correct answer is (d) 4.5×10^6N

Easiest explanation: dm/dt = 100kg/s, u = 4.5×10^4m/s

Thrust, F = u*(dm/st) = 4.5×10^4×100 = 4.5×10^6N.