Q.

A rocket having initial mass of 1000 kg burns fuel at the rate of 4 kg/s. If the speed of exhaust gases relative to the rocket is 3000 m/s, the initial thrust on the rocket is:

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a

1.2 N

b

3 x 103N

c

4 x 103N

d

1.2 x 104N

answer is D.

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Detailed Solution

Thrust on rocket =vdmdt=4×3000=12000N=1.2×104N
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A rocket having initial mass of 1000 kg burns fuel at the rate of 4 kg/s. If the speed of exhaust gases relative to the rocket is 3000 m/s, the initial thrust on the rocket is: