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Math Help - Work and Mass

  1. #1
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    Work and Mass

    A great conical mound of height h is built. If the workers simply heap up uniform material found at ground level. and if the total weight of the finished mound is M, show that the work they do is .25hM.
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  2. #2
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    find the cone's center of mass w/r to the ground.
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  3. #3
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    I'm still having trouble with this one.
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