Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Calculating weight & accelleration due to gravity on other planets Help please!

  1. Nov 17, 2004 #1
    Alright, well this problem was too hard to explain, so I just decided to scan it ;).

    Here's the problem:
    http://img108.exs.cx/img108/5815/approb.gif

    I'm pretty sure I'll be able to figure out everything else once I get part (a). But I don't know where to start with this.

    Thanks.
     
  2. jcsd
  3. Nov 17, 2004 #2

    Galileo

    User Avatar
    Science Advisor
    Homework Helper

    You're given:
    [tex]R_{Mars}=0.53R_{Earth}[/tex]
    [tex]M_{Mars}=0.11M_{Earth}[/tex]
    (radius and mass respectively).

    The acceleration at the surface of a planet canbe obtained by Newton's law of gravitation:
    [tex]F=G\frac{mM}{r^2}[/tex]
    since F=ma, the acceleration an object undergoes a distance R from the center is:
    [tex]a=G\frac{M}{R^2}[/tex].
     
  4. Nov 17, 2004 #3
    Ahh!

    Thank you very much Galileo.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook