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Unformatted text preview: hamdeh (ah37785) – HW 7 – opyrchal – (111213) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A block starts at rest and slides down a fric- tionless track except for a small rough area on a horizontal section of the track (as shown in the figure below). It leaves the track horizontally, flies through the air, and subsequently strikes the ground. The acceleration of gravity is 9 . 81 m / s 2 . μ =0 . 2 1 . 1 m b b b b b b b b b b b b 490 g h 1 . 9m 4 . 51 m 9 . 81m / s 2 v At what height h above the ground is the block released? Answer in units of m 002 10.0 points A spring with a spring-constant 3 . 6 N / cm is compressed 31 cm and released. The 7 kg mass skids down the frictional incline of height 36 cm and inclined at a 23 ◦ angle. The acceleration of gravity is 9 . 8 m / s 2 . The path is frictionless except for a dis- tance of 0 . 6 m along the incline which has a coefficient of friction of 0 . 3 ....
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