Physics

A planet has a mass of 6.06x 10^23 kg and a radius of 3.99 x 10^6 m. a) What is the acceleration due to gravity on this planet? b) how much would a 72.5 kg person weigh on this plane?

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asked by Kristi
  1. "g"= GMp/radius^2

    weight= 72.5*"g"

  2. m g = G m M/r^2
    so
    g = G M/r^2 = 6.67*10^-11 * 6.06*10^23 *10^-12 / 3.99^2

    = 40.42 * 10^0

    = 40.42 or about 4 times earth g

    m g = 72.5*40.42 = 2930 Newtons

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    posted by Damon

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