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solution_pdf15 - reddy(ar38357 Torque clancy(SCI411-2 This...

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reddy (ar38357) – Torque – clancy – (SCI411-2) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points A box with its center oF mass o±-center as indicated by the dot is placed on an inclined plane. In which orientation does the box tip over? 1. None oF the orientations will cause the box to tip over. 2. b 3. correct 4. 5. Explanation: In order to tip over, the box must pivot about its bottom leFt corner. The only orien- tation where gravity creates a torque su²cient to tip the block is 002 10.0 points A Friend incorrectly says that a body cannot rotate when the net torque acting on it is zero. What is the correct statement? 1. A body can rotate only when a non-zero net torque acts on it. 2. A body’s rotation cannot change iF the net torque acting on it is zero. correct 3. Once a body starts rotating the net torque is zero. 4. The original statement is actually cor- rect. Explanation: The rotation oF a body cannot change when a zero net torque acts on it. Once rotating, a body will continue rotating even when no torque acts on it. Again, emphasize change . 003 10.0 points A bucket flled with water has a mass oF 48 kg and is hanging From a rope that is wound around a stationary cylinder oF radius 0 . 048 m. IF the cylinder does not rotate and the bucket hangs straight down, what is the mag- nitude oF the torque produced by the bucket around the center oF the cylinder? The accel- eration oF gravity is 9 . 81 m / s 2 .
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