Question

A rocket has a mass of 100 kg. Ninety percent of this is fuel. It
ejects fuel vapors at the rate of 1 kg/sec with a velocity of 500
m/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
(a) zero (b) 500 newton
(c) 1000 newton (d) 2000 newton

Answer 1

Explanation:

HEY MATE HERE IS YOUR ANSWER

Rate of fuel consumption dtdm =1 kg/sRelative velocity of gases w.r.t rocket v rel =500m/sInitial upthrust on the rocket F= dtdm v rel ∴ F=1×500=500 N

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