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Equilibrium of an object orbiting around a planet
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[QUOTE="Gigaz, post: 5937669, member: 625635"] The parenthesis means this: If something disturbs the rate of rotation of the rod, the angular momentum would to a first order be conserved and the rod could rotate to a point where it is for example parallel to the surface of the planet, in which case you have something totally different. They want the angular momentum of the rod to be fixed. This is not entirely unreasonable - the moon is also gravity-locked in a similar way. This should also tell you that the situation is probably stable. You already guessed correctly that the gravity is different and that the rod should then probably be in tension. Now comes the hardest part: Why is the situation stable? What I would do is write down an energy balance for a slightly rotated rod and see if the perpendicular state has the lowest energy. Hint: You probably need spherical/cylindrical coordinates. [/QUOTE]
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Equilibrium of an object orbiting around a planet
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