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Homework Help: Find accel. of g on Saturns Moon.

  1. Jul 16, 2008 #1
    ]1. The problem statement, all variables and given/known data[/b]

    Calculate the gravitational acceleration at the surface of (a) Mercury and (b) Saturn's moon Titan?

    Ive found A by using: F=GMm/r^2

    a=Gm/r^2

    But how do I find saturns moon titan....All i know is saturn mass which is 5.69e26 and radius6.03e7 of staurn, plus orbit radius 1.43e12

    these are not given in the problem I have a chart with the main planets info.
    I thought i could just use saturns radius plus orbitsal radius for "r" and use that...but it didnt work.
     
  2. jcsd
  3. Jul 16, 2008 #2

    Kurdt

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    Last edited by a moderator: Apr 23, 2017
  4. Jul 16, 2008 #3
    Thankyou ,
    but that does give me the Acceleration of G on the Titan.
    example: earths its 9.81m/s^2
    ? m/s^2

    What should I use for "r" Do I add saturns radius plus What..? Do I need the distance titan is from saturn?
     
  5. Jul 16, 2008 #4

    Kurdt

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    You use the radius of Titan. I'd ignore Saturn unless you've been specifically told to include it.
     
  6. Jul 16, 2008 #5
    Re: Mars orbit around the Sun

    ok I did

    ..........G.............mass of Titan..../Radius of titan(sq'ed)
    a=((6.67259e-11)(1.35e23))/(2.57e3)^2

    I get 1.35e6 which is way to big for m/s^2 accel.
     
  7. Jul 16, 2008 #6

    Kurdt

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    You've left the radius in kilometers not meters.
     
  8. Jul 16, 2008 #7
    SHouldnt accel. be a number like 3.5ms/^2 not (a number)e6 or 9 ...it should be alot smaller?
     
  9. Jul 16, 2008 #8

    Kurdt

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    it will be if you use the correct units for the radius.
     
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