In Robert Heinleins The Moon is a Harsh Mistress, the colonial inhabitants of the Moon threaten to
Question:
In Robert Heinlein’s “The Moon is a Harsh Mistress,” the colonial inhabitants of the Moon threaten to launch rocks down onto the Earth if they are not given independence (or at least representation). Assuming that a rail gun could launch a rock of mass m at twice the lunar escape speed, calculate the speed of the rock as it enters the Earth’s atmosphere. (By lunar escape speed we mean the speed required to move infinitely far away from a stationary Moon alone in the Universe. Problem 61 in Chapter 30 describes a rail gun.)
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We interpret lunar escape speed to be the escape speed from the surface of a stationary moon alon...View the full answer
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