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Physics 15200- HW16

Physics 15200- HW16 - lai(yl8859 HW16 Ross(15200 This...

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lai (yl8859) – HW16 – Ross – (15200) 1 This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A one-piece cylinder has a core section pro- truding from the larger drum and is free to ro- tate around its central axis. A rope wrapped around the drum of radius 1 . 25 m exerts a force of 4 . 14 N to the right on the cylinder. A rope wrapped around the core of radius 0 . 44 m exerts a force of 8 . 52 N downward on the cylinder. 4 . 14 N 8 . 52 N What is the magnitude of the net torque acting on the cylinder about the rotation axis? Answer in units of N · m. 002 (part 1 of 2) 10.0 points The motor driving a grinding wheel with a rotational inertia of 0 . 39 kg m 2 is switched off when the wheel has a rotational speed of 22 rad / s. After 12 s, the wheel has slowed down to 17 . 6 rad / s. What is the absolute value of the constant torque exerted by friction to slow the wheel down?
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