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A 600 kg rocket is set for a vertical firing. If the exhaust speed is 1000 ms -1 the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is (a) 1/7.6 kg s -1 (b) 58.6 kg s -1 (c) 6 kg s -1 (d) 76.4 kg s -1



A 600 kg rocket is set for a vertical firing. If the exhaust speed is 1000 ms-1 the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is


        (a)    1/7.6 kg s-1


        (b)    58.6 kg s-1


        (c)    6 kg s-1


        (d)    76.4 kg s-1


Grade:11

1 Answers

Navjyot Kalra
askIITians Faculty 654 Points
7 years ago

(c)
    Thurst =   (udM )/dt=mg => dM/dt=mg/u

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