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Liquid fuel is burnt in a rocket and its...

Liquid fuel is burnt in a rocket and its exhaust gas is rejected from its tail at a velocity of `10km//s`. The force acting on the rocket is `2xx10^(4)N`. At what rate the liquid fuel is burnt?

A

1.5 kg /s

B

2 kg/s

C

2.5 kg /s

D

3 kg /s

Text Solution

Verified by Experts

The correct Answer is:
B
`F = v (dm)/(dt)`
` F = 2 xx 10^(4) N and v = 10 km//s = 10 xx 10^(3) m//s`
`therefore (dm)/(dt) = (F)/(v) = (2 xx 10^(4))/( 10 xx 10^(3)) = 2 kg //s `
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