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Unformatted text preview: luzon (jrl2375) HW8 Liu (80440) 1 This print-out should have 18 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. This assignment is due at 9:00PM, Monday, Oct.19,2009. 001 10.0 points The figure below shows a rough semicircular track whose ends are at a vertical height h . A block placed at point P at one end of the track is released from rest and slides past the bottom of the track. h P What height on the far side of the track does the block reach if the coefficient of kinetic friction is 0 . 1 . 1. h = 0 . 1 h 2 2. h = 0 . 9 h 3. h = 0 . 9 h 2 4. h = 0 . 1 h 2 5. h = h 6. h = 0 . 9 h 2 7. h = 0 . 1 h 8. It is between zero and h ; the exact height depends on how much energy is lost to fric- tion. 002 10.0 points A block of mass m slides on a horizontal frictionless table with an initial speed v . It then compresses a spring of force constant k and is brought to rest. The acceleration of gravity is 9 . 8 m / s 2 . v m k m = 0 How much is the spring compressed x from its natural length? 1. x = v m k g 2. x = v k g m 3. x = v 2 2 m 4. x = v radicalbigg k m 5. x = v radicalBigg k mg 6. x = v mk g 7. x = v 2 2 g 8. x = v radicalbigg m k 9. x = v mg k 10. x = v radicalbigg mg k 003 10.0 points A bead slides without friction around a loop- the-loop. The bead is released from a height of 22 . 4 m from the bottom of the loop-the- loop which has a radius 8 m....
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