A rocket has a mass of $$100kg$$. Ninety percent of this is fuel. It ejects fuel vapors at the rate of $$1$$ $$kg/$$$$sec$$ with a velocity of $$500m/$$$$sec$$ relative to the rocket. It is supposed that the rocket is outside the gravitational field. The initial upthrust on the rocket when it just starts moving upwards is :

Question

A rocket has a mass of $$100kg$$. Ninety percent of this is  fuel. It ejects fuel vapors at the rate of $$1$$ $$kg/$$$$sec$$ with a velocity of  $$500m/$$$$sec$$ relative to the rocket. It is supposed that the rocket is outside  the gravitational field. The initial upthrust on the rocket when it just  starts moving upwards is :

Infinity Learn · Accepted Answer

Initial thrust on the rocket $$=$$ ΔmΔtvrel                                                 $$=500$$×$$1=500N$$     Where ΔmΔ$$t=$$     rate of ejection of fuel.

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