physics

A 100-kg object is lifted to an altitude of 1000 km. What is the weight of the object on the ground? Does it have the same mass and weight at 1000 km? Explain.

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asked by Gene
  1. on the ground, the weight is mg = 100*9.8 = 980N

    Now, g=9.8 because

    F = GMm/r^2 = mg, so
    g = GM/r^2
    If we say that r=6371km, then at 1000km altitude, we will have

    9.8 * (6371/7371)^2 = 7.32, so the 100kg mass will weigh only 732N

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    posted by Steve

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