ch12-p078 - 78. (a) For computing torques, we choose the...

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78. (a) For computing torques, we choose the axis to be at support 2 and consider torques which encourage counterclockwise rotation to be positive. Let m = mass of gymnast and M = mass of beam. Thus, equilibrium of torques leads to 1 (1.96m) (0.54m) (3.92m)=0. Mg mg F −− Therefore, the upward force at support 1 is F 1 = 1163 N (quoting more figures than are significant — but with an eye toward using this result in the remaining calculation). In
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