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29 July, 05:14

A 1.90-m-long barbell has a 25.0 kg weight on its left end and a 37.0 kg weight on its right end. if you ignore the weight of the bar itself, how far from the left end of the barbell is the center of gravity?

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  1. 29 July, 09:07
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    To solve for the distance from the left end of the barbell:37 * 1.9 = (37 + 25) * x x = 37*1.9 / (37+20) = 1.23333 m

    Additional info: if we are going to repeat this with a uniform bar of mass 9kg whose center of mass is 0.75 m from the left, the answer would be

    37 * 1.9 + 9 * 0.75 = (37 + 25 + 9) * y y = (37 * 1.9 + 8 * 0.75) / (37 + 25 + 9) = 1.07 m
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