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# HW18 - Thevalingam Donald Homework 18 Due Feb 7 2007...

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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 0 P 18 The two highest points of the ball’s trajec- tory are Q and Q 0 ; at these points the string is ± 18 from the vertical. Point P is the lowest point of the ball’s trajectory where the string hangs vertically down. The acceleration of gravity is 9 . 8 m / s 2 . What is the ball’s 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 ball’s acceler- ation at the point P ? Answer in units of m / s 2 . 003 (part 3 of 6) 10 points What is the ball’s 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 ball’s 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. 2. The ball falls vertically straight down.

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HW18 - Thevalingam Donald Homework 18 Due Feb 7 2007...

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