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Math Help - Newton's Law of Gravitation

  1. #16
    Newbie cherryblossom289's Avatar
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    Re: Newton's Law of Gravitation

    Do you go to MCC? Is this from Madeline's worksheet? I am stuck on this too!
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  2. #17
    MHF Contributor MarkFL's Avatar
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    Re: Newton's Law of Gravitation

    Do you follow what has been posted so far? If not I will be glad to try to explain.
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  3. #18
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    Re: Newton's Law of Gravitation

    In this case, I believe the magnitude of F given should be differentiated w/r to r ...

    F = \frac{k}{r^2}

    \frac{dF}{dr} = -\frac{2k}{r^3} where \frac{dF}{dr} is a rate of change of force magnitude in \frac{N}{m} and can be determined from the given info.

    ... The problem is poorly worded, imho. The question asking "how fast" could have been made more clear.
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  4. #19
    MHF Contributor MarkFL's Avatar
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    Re: Newton's Law of Gravitation

    You are most likely right, as no information is given about the speed of ascent. When I hear "how fast" I think of a time rate of change.
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