# HW 21 - Morby Grant Homework 21 Due noon Inst Drummond This...

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Morby, Grant – Homework 21 – Due: Mar 22 2006, noon – Inst: Drummond 1 This print-out should have 14 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 2) 0 points Calculate the moment of inertia of a solid cylinder of mass 13 . 2 kg and radius 8 . 86 m about an axis parallel to the center-of-mass axis and passing through the edge of the cylin- der. (Use the parallel-axis theorem and Table 10.2) Answer in units of kg m 2 . 002 (part 2 of 2) 0 points Calculate the moment of inertia of a solid sphere of mass 9 . 92 kg and radius 7 . 98 m about an axis tangent to its surface. Answer in units of kg m 2 . 003 (part 1 of 3) 0 points Assume: When the disk lands on the surface it does not bounce. The disk has mass m and outer radius R with a non-uniform radial mass distribution so that its moment of inertia I = 8 9 m R 2 . A disk is given a hard kick along a hori- zontal surface. The kicking force acts along a horizontal line through the disk’s center, so the disk acquires a linear velocity v 0 but no angular velocity. The kinetic friction force between the sur- face and the disk slows down its linear motion while at the same time making the disk spin on its axis at an accelerating rate. Eventually, the disk’s rotation catches up with its linear

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