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Math Help - A Practive Exam

  1. #1
    Junior Member Selim's Avatar
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    A Practive Exam

    Hello, I recently started Calculus and I was hoping you could help. I will be doing my best to work through them and posting my results here as examples of what (or what not to) do. I'm not a terrific student at this point, which is what prompted me to join this forum, so don't expect amazing work from me.

    1. Three point-masses of 100, 80, and 70 kg are located at -3, 2, and 4, respectively, on an x-axis. Find the center of mass.
    Last edited by Selim; February 21st 2010 at 06:48 PM.
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  2. #2
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    Hi Selim, welcome to our forum, please post only 1 question per thread with your attempts at working it out.

    This will be best for everyone.
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  3. #3
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    Quote Originally Posted by Selim View Post
    Hello, I recently started Calculus and I was hoping you could help. I will be doing my best to work through them and posting my results here as examples of what (or what not to) do. I'm not a terrific student at this point, which is what prompted me to join this forum, so don't expect amazing work from me.
    Multiply each mass point by its coodinate. Find the sum of these products.
    Divide this sum by the sum of the masses. The answer is the coordinate of the center of mass.
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  4. #4
    Junior Member Selim's Avatar
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    (100*-3)+(80*2)+(70*4)=140
    100+80+70=250
    140/250=14/25

    Answer: (14/25, y)

    Is that correct?
    Last edited by Selim; February 22nd 2010 at 12:39 PM.
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  5. #5
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    Quote Originally Posted by Selim View Post
    (100*-3)+(80*2)+(70*4)=140
    100+80+70=250
    140/250=14/25

    Answer: (14/25, y)

    Is that correct?
    All three points are on the x-axis. The center of mass will also be on the x-axis.
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  6. #6
    Junior Member Selim's Avatar
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    Oops, so then (14/25, 0) ?
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