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Unformatted text preview: lai (yl8859) – HW16 – Ross – (15200) 1 This printout should have 6 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A onepiece 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 . 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? Correct answer: 1 . 4262 N · m. Explanation: Let : F 1 = 4 . 14 N , R 1 = 1 . 25 m , F 2 = 8 . 52 N , and R 2 = 0 . 44 m . τ net = τ ccw τ cw = F 1 R 1 F 2 R 2 = (4 . 14 N)(1 . 25 m) (8 . 52 N)(0 . 44 m) = 1 . 4262 N · m , which has a magnitude of 1 . 4262 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 .....
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This note was uploaded on 02/24/2011 for the course PHYS 152 taught by Professor Button during the Winter '08 term at IUPUI.
 Winter '08
 BUTTON
 mechanics

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