Spaceship Problem: A spaceship on a launchpad weighs 30 tons (Figure 11-2d). By the time

Chapter 11, Problem 2

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Spaceship Problem: A spaceship on a launchpad weighs 30 tons (Figure 11-2d). By the time it reaches an altitude of 70 mi, the spaceshipweighs only 10 tons because it has used20 tons of fuel. Assume that the weight of thespaceship decreases linearly with displacementabove Earth.Figure 11-2da. How many mile-tons of work are done inlifting the spaceship to an altitude of 70 mi?b. The rocket engines exert a constant thrust(that is, force) of 90 tons. How much workwas done by the engines in lifting thespaceship to 70 mi? What do you thinkhappens to the excess energy from part a?

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