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The expression e p = mgh applies only close to the surface of the earth. the general expression for the potential energy of a mass m at a distance r from the center of the earth (of mass m e ) is e p = − g m e m / r . write r = r e + h , where r e is the radius of the earth; show that, when h ≪ r e , this general expression reduces to the special case, and find an expression for g. you will need the expansion ( 1 + x ) − 1 = 1 − x + … .
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