Problem 8.88 A student sitting on a frictionless rotating stool has rotational i

Question

Problem 8.88 A student sitting on a frictionless rotating stool has rotational inertia 0.88 about a vertical axis through her center of mass when her arms are tight to her chest. The stool rotates at 7.00 and has negligible mass. The student extends her arms until her hands, each holding a 5.5 mass, are 0.73 from the rotation axis. Part A Ignoring her arm mass, what's her new rotational velocity? Part B Repeat if each arm is modeled as a 0.73 long uniform rod of mass of 4.6 and her total body mass is 57 .

Explanation / Answer

0.88*7 = (0.88+2*5.5*0.73*0.73)W 0.88*7 = (0.88+2*0.5*4.6*0.73*0.73)W

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