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Math Help - relative masses

  1. #16
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    k = 1/9 can't possibly be right. That's what you'd get if the LHS's were equal, but they're not. Can you show your work?

    Weight is the gravitational force acting on a mass, so it is a force. As to deriving the W = mg equation from the gravitational force equation, just set F = W, and combine the two equations in post # 8.
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  2. #17
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    Quote Originally Posted by Ackbeet View Post
    k = 1/9 can't possibly be right. That's what you'd get if the LHS's were equal, but they're not. Can you show your work?

    Weight is the gravitational force acting on a mass, so it is a force. As to deriving the W = mg equation from the gravitational force equation, just set F = W, and combine the two equations in post # 8.
    I get something different now. [LaTeX ERROR: Convert failed] so M'=13/630M
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  3. #18
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    Hmm. I get

    \dfrac{700}{130}=\dfrac{71.43\,G\,m_{\text{earth}}  }{r_{\text{earth}}^{2}}\cdot\dfrac{(3r_{\text{eart  h}})^{2}}{71.43\,G\,m_{\text{planet}}}=\dfrac{9m_{  \text{earth}}}{m_{\text{planet}}}\dots

    I think your 9 is dividing when it should be multiplying, or vice versa.
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  4. #19
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    Quote Originally Posted by Ackbeet View Post
    Hmm. I get

    \dfrac{700}{130}=\dfrac{71.43\,G\,m_{\text{earth}}  }{r_{\text{earth}}^{2}}\cdot\dfrac{(3r_{\text{eart  h}})^{2}}{71.43\,G\,m_{\text{planet}}}=\dfrac{9m_{  \text{earth}}}{m_{\text{planet}}}\dots

    I think your 9 is dividing when it should be multiplying, or vice versa.
    yes your right. Sorry this has been really terrible.
    Last edited by mr fantastic; March 10th 2011 at 02:29 PM. Reason: Deletd imnplication of bad language.
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  5. #20
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    So, are you all set, then?
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  6. #21
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    Quote Originally Posted by Ackbeet View Post
    So, are you all set, then?
    Yes thanks
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  7. #22
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    You're welcome. Hope things go better for you!
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