1.

A rocket, set for vertical launching, has a mass of 50 kg and contains 450 kg of fuel. It can have a maximum exhaust speed of 1 kms^(-1) If g = 10 ms^(-2). What should be the minimum rate of fuel consumption to just lift it off the launching pad ?

Answer»

`10 kg s^(-1)`
`5 kg s^(-1)`
`7.5 kg s^(-1)`
`2.5 kg s^(-1)`

Solution :Here Thrust `F=u(dm)/(dt)`
to lift the ROCKET `F=Mg`
`:.Mg=u(dm)/(dt)implies(dm)/(dt)=(500xx10)/(1000)=5kg s^(-1)`
HENCE correct choice is (b)


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