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Q. Estimate the distance of an object from the Earth's center so that it experiences the same strength of attractive force from the Moon and from the the Earth.

Q. A skier of mass 62.00 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 55.00 m up a 30° slope (assumed frictionless) at a constant speed of 3.40 m/s?

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