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Unformatted text preview: markowitz (am45362) – HW05 – distler – (56295) 1 This print-out should have 21 questions. Multiple-choice 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 asked-for 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