The Mars trip described in Fig. 10.23 required the expulsion of 365 tons of propellant at a velocity of 84 km/s for an initial vehicle mass of 730 tons. From these data calculate the equivalent free space ∆u of this mission, assuming that no other mass is expelled. For the stated propulsion time, compare the actual specific impulse with the optimum specific impulse obtained from Eq. (10.43), assuming α/η = 5 kg/kW.
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