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# solution_pdf10 - reddy(ar38357 Energy and Rocket problems...

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reddy (ar38357) – Energy and Rocket problems – clancy – (SCI411-2) 1 This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 (part 1 oF 2) 10.0 points Note: A bungee cord can stretch, but it is never compressed. When the distance be- tween the two ends oF the cord is less than its unstretched length L 0 , the cord Folds and its tension is zero. ±or simplicity, neglect the cord’s own weight and inertia as well as the air drag on the ball and the cord. A bungee cord has length L 0 = 24 m when unstretched; when it’s stretched to L > L 0 , the cord’s tension obeys Hooke’s law with “spring” constant 63 N / m. To test the cord’s reliability, one end is tied to a high bridge oF height 66 m above the surFace oF a river) and the other end is tied to a steel ball oF mass 81 kg. The ball is dropped o² the bridge with zero initial speed. ±ortunately, the cord works and the ball stops in the air a Few meters beFore it hits the water — and then the cord pulls it back up. The acceleration oF gravity is 9 . 8 m / s 2 . Calculate the ball’s height above the wa- ter’s surFace at this lowest point oF its trajec- tory.

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solution_pdf10 - reddy(ar38357 Energy and Rocket problems...

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