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Unformatted text preview: Thevalingam, Donald Homework 18 Due: Feb 7 2007, midnight Inst: Eslami 1 This print-out should have 17 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 6) 10 points A heavy ball swings on a string in a circular arc of radius 1 m. Q 1 m Q P 1 8 The two highest points of the balls trajec- tory are Q and Q ; at these points the string is 18 from the vertical. Point P is the lowest point of the balls trajectory where the string hangs vertically down. The acceleration of gravity is 9 . 8 m / s 2 . What is the balls speed at the point P ? Ne- glect air resistance and other frictional forces. Answer in units of m / s. 002 (part 2 of 6) 0 points What is the magnitude of the balls acceler- ation at the point P ? Answer in units of m / s 2 . 003 (part 3 of 6) 10 points What is the balls speed at the point Q ? 1. 0 m / s < k v Q k < k v p k 2. k v Q k = 0 m/s 3. k v Q k < 0 m/s 4. k v Q k > k v p k 5. k v Q k = k v p k 004 (part 4 of 6) 0 points What is the magnitude of the balls acceler- ation at the point Q ? Answer in units of m / s 2 . 005 (part 5 of 6) 10 points After several swings, the string breaks. The mass of the string and air resistance are neg- ligible. If the break occurs when the ball is at point P , describe the motion of the ball after the break. 1. It moves horizontally with a constant speed....
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This note was uploaded on 04/05/2010 for the course PHY 52033 taught by Professor Tleva during the Spring '10 term at University of Texas at Austin.
- Spring '10