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A 4000 kg rocket is fired. If the exhaust speed is $500 m s^{- 1}$ , how much gas must be ejected per second to supply the thrust needed, to overcome the weight of the rocket?

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58.8 Kg/s

132.8 Kg/s

78.4 Kg/s

93.2 Kg/s

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detailed solution

Correct option is C

Mg=udmdt dmdt=Mgu =40008×9.8500=78.4

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A 4000 kg rocket is fired. If the exhaust speed is 500 ms−1 , how much gas must be ejected per second to supply the thrust needed, to overcome the weight of the rocket?

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Ready to Test Your Skills?

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A 4000 kg rocket is fired. If the exhaust speed is $500 m s^{- 1}$ , how much gas must be ejected per second to supply the thrust needed, to overcome the weight of the rocket?