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Q.

A rocket of mass 8000kg  is set for vertical firing. If the exhaust speed is1kms–1 . The rate of mass of gas ejected to supply a thrust needed to give the rocket an initial upward acceleration of 10.2 m/s2  is

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a

150 kg/sec

b

160kg/sec

c

28kg/sec

d

180kg/sec

answer is B.

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Detailed Solution

M(g+a)=udmdt 8000(9.8+10.2)=1000dmdt dmdt=8×20=160
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