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Unformatted text preview: markowitz (am45362) – HW05 – distler – (56295) 1 This printout should have 21 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. There are various ways to do part 2 of the ”Wind and Pendulum” problem. The easiest is to find the angle at which the three forces on the ball (tension, gravity and F) add up to zero. In part 1 of ”Pulling Two Masses”, you are asked about the ”work done against fric tion”. This is very funny phraseology. The friction does negative work, and what you are being askedfor is the magnitude (a positive number) of the work done by friction. 001 10.0 points A weight lifter lifts a mass m at constant speed to a height h in time t . How much work W is done by the weight lifter? 1. W = mg h 2. W = mg h t 3. W = mg 4. W = mh 5. W = mg ht 002 10.0 points A spring with spring constant of 35 N / m is stretched 0 . 18 m from its equilibrium position. How much work must be done to stretch it an additional 0 . 1 m? Answer in units of J 003 (part 1 of 2) 10.0 points A 0 . 7 kg bead slides on a curved wire, starting from rest at point A as shown in the figure. The segment from A to B is frictionless, and the segment from B to C is rough. The point A is at height 8 . 9 m and the point C is at height 0 . 3 m with respect to point B. The acceleration of gravity is 9 . 8 m / s 2 . A 8.9 m B .3 m C Find the speed of the bead at B....
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This note was uploaded on 11/29/2011 for the course PHY 302K taught by Professor Kaplunovsky during the Spring '08 term at University of Texas at Austin.
 Spring '08
 Kaplunovsky
 Physics

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