Physics

A planet has a mass of 6.15 × 1023 kg and a radius of 3.25 × 106 m. (a) What is the acceleration due to gravity on this planet? (b) How much would a 79.4-kg person weigh on this planet?

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asked by Elle
  1. F = m g = G M m /R^2
    so
    g = G M/R^2 =
    6.67*10^-11*6.15*10^23/[(3.25^2)*10^12]
    = 3.88 * 10^0 = 3.88 m/s^2
    about 1/3 of earth g
    weight = m g = 79.4 * 3.88 = 308 Newtons

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    posted by Damon

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