One important characteristic of rocket engines is the specific impulse, which is defined as the total impulse (time integral of the thrust) per unit ground weight of fuel/oxidizer expended. (The use of weight, instead of mass, in this definition is due to purely historical reasons.)
a) Consider a rocket engine operating in free space with an exhaust nozzle speed of v. Calculate the specific impulse of this engine.
b) A model rocket engine has a typical exhaust speed of vtoy = 800. m/s. The best chemical rocket engines have exhaust speeds of approximately vchem = 4.00 km/s. Evaluate and compare the specific impulse values for these engines.
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