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The force on a rocket moving with a velo...

The force on a rocket moving with a veloctiy 300 m/s is 210N. The rate of consumption of fuel of rocket is

A

`0.7kgs^(-1)`

B

`1.4kgs^(-1)`

C

`0.07kgs^(-1)`

D

`10.7kgs^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
Motion of a rocket is an example of variable mass because of the continuous combustion of the fuel.
The force on the rocket is given by
`F= v(dm)/(dt) " " therefore 210= 300 xx (dm)/(dt)`
`therefore (dm)/(dt) = (210)/(300) = (7)/(10) = 0.7 kg//s`
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