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Homework Help: Gravitational Force problem

  1. Oct 18, 2009 #1
    1. The problem statement, all variables and given/known data
    What distance must an astronaut be so that his weight is half what it is on earth?
    Give your answer as a coefficient of the earth's radius.
    I tried dividing the old force by the new force, but i don't if the radius for the new one should be xr or r+x
    where r=earth`s radius

    i did it with xr and i got x=[tex]\sqrt{2}[/tex] but the answer is ([tex]\sqrt{2}[/tex]-1)r

    edit: go it it's asking how much off the surface so you need to subtract the r
    no need for explaining, thanks, mods please delete, if you can, this post;
    i'll make sure to read the question more thoroughly next time, sorry
    Last edited: Oct 18, 2009
  2. jcsd
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