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A rocket at rest in space, where there is virtually no gravity, has a mass of 2.55 X 10 5 kg, of which 1.81 X 10 5 kg is fuel. The engine consumes fuel at the rate of 480 kg/s, and the exhaust speed is 3.27 km/s. The engine is fired for 250 s. (a) Find the thrust of the rocket engine. (b) What is the mass of the rocket after the engine burn? (c) What is the final speed attained?
The negative sign highlights the fact that the final velocity of the plane is in the opposite direction as that with the direction of the relative velocity of exhaust gases.Therefore, the final speed of the rocket is 2.07 km/s .
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