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Unformatted text preview: schneiter (tcs639) – HW16 – Ross – (89152) 1 This printout should have 8 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 . 36 m exerts a force of 4 . 21 N to the right on the cylinder. A rope wrapped around the core of radius . 69 m exerts a force of 7 . 62 N downward on the cylinder. 4 . 21 N 7 . 62 N What is the magnitude of the net torque acting on the cylinder about the rotation axis? Correct answer: 0 . 4678 N · m. Explanation: Let : F 1 = 4 . 21 N , R 1 = 1 . 36 m , F 2 = 7 . 62 N , and R 2 = 0 . 69 m . τ net = τ ccw τ cw = F 1 R 1 F 2 R 2 = (4 . 21 N)(1 . 36 m) (7 . 62 N)(0 . 69 m) = 0 . 4678 N · m , which has a magnitude of . 4678 N · m . 002 (part 1 of 2) 10.0 points The motor driving a grinding wheel with a rotational inertia of 0 . 34 kg m 2 is switched off when the wheel has a rotational speed of 40 rad / s. After 11 s, the wheel has slowed down to 32 rad / s. What is the absolute value of the constant torque exerted by friction to slow the wheel down?...
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 Spring '08
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 mechanics, Force, kg

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