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A 80 kg man weighs 784 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 15% of his body weight?

  • physics - ,

    Let Re be the earth's radius and h be the required altitude. Since g is inversely proportional to radius squared,

    [Re/(Re + h)]^2 = 0.85

    Look up Re and solve for h

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