Homework Help: physics

Posted by alex on Monday, December 19, 2011 at 6:31pm.

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 - drwls, Tuesday, December 20, 2011 at 2:13am
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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