Center of MassHard

Question

If the thrust force on a rocket which is ejecting gases with a relative velocity of 300 m/s, is 210 N. Then the rate of combustion of the fuel will be :

Options

A.10.7 kg/sec   
B.0.07 kg/sec   
C.1.4 kg/sec
D.0.7 kg/sec

Solution

F = μ
210 = 300 ×
⇒ = 0.7 kg/s

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