solution_pdf10

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

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 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 find 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 , the cord folds and its tension is zero. For simplicity, neglect the cords own weight and inertia as well as the air drag on the ball and the cord. A bungee cord has length L = 24 m when unstretched; when its stretched to L > L , the cords tension obeys Hookes law with spring constant 63 N / m. To test the cords 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 off the bridge with zero initial speed. Fortunately, 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 balls height above the wa- ters surface at this lowest point of its trajec- tory. Correct answer: 1 . 76741 m. Explanation: In the absence of air drag and other resistive forces, there are only two forces acting on the ball the gravity force mvectorg...
View Full Document

Page1 / 3

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online