Questions
A rocket of mass 100 kg burns 0.1 kg of fuel per sec. If velocity of exhaust gas is 1 km/sec, then it lifts with an acceleration of
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Correct option is D
dmdt=0.1kg/sec; Mass of the rocket =100kg u=1km/sec=1000m/sec.F=d(mu)dt=mdudt−udmdt=0as the mass is decreasing 100a−1000×0.1=0a=+1m/s2Similar Questions
Statement I : The familiar equation mg = R for a body on a table is true only if the body is in equilibrium.
Statement II : The equality of mg and R has no connection with the third law.
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