Question: Rocket engines work by expelling gas at a high speed as illustrated in Figure P7.71. We wish to design an engine that expels an amount

Rocket engines work by expelling gas at a high speed as illustrated in Figure P7.71. We wish to design an engine that expels an amount of gas m_g= 50 kg each second, and we want the engine to exert a force F = 20,000 N on a rocket. At what speed v_gshould the gas be expelled? Assume the mass of the rocket is very large.

Figure P7.71

? Spacecraft + engine Gas

Spacecraft + engine Gas

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