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Flame SCF 18 Near Chawla Lights Ph-7 Mohali 9888949978

3. A rocket has a mass of 100 kg. 90% of this is fuel. It ejects fuel vapours 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 N

(c) 1000 N (d) 2000 N

ANSWER : b

5/5 - (4 votes)

PrevPrevious2. A player caught a cricket ball of mass 150 gm moving at a rate of 20 m/s. If the catching process be completed in 0.1 s, then the force of the blow exerted by the ball on the hands of the player is

Next4. In which of the following cases forces may not be required to keep theNext

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