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Introductory Physics Homework Help
Ball dropped through a tunnel through the earth.
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[QUOTE="I like Serena, post: 4836469, member: 312166"] Let's assume that ##R## is the radius of the planet, and ##r## is the distance between the body and the center. Then the attractive force is [I]not[/I] just ##F=-\frac{GMm}{r^2}##. The value of ##M## that you should use varies with ##r##, since we're [I]inside[/I] the planet. The ##M## that contributes is the mass in the sub sphere that is still between you and the center of the planet. To calculate it, we need to assume for instance that the mass density is constant. What would the mass ##M(r)## of the sub sphere of radius ##r## be? [/QUOTE]
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Ball dropped through a tunnel through the earth.
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