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qz9sm08sol - August1,2008 PHY2053Discussion...

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August 1, 2008 PHY2053 Discussion Quiz 9 (Chapter 13.1-13.4) Name:                                   UFID: *1. (5pts) A 2.00-kg block is attached to a horizontal spring with a spring constant of  600.N/m. The spring is stretched a distance of 0.200 m and the block is released from  rest. What is the speed of the block when it passes through the equilibrium position if  the coefficient of kinetic friction between the block and the floor is 0.250? Applying the work-energy theorem to the initial and final state of the system, we have -μmgA = (1/2)mv²-(1/2)kA²   v = √(kA²/m-2μgA) = √(600×0.2²/2-2×0.25×9.8×0.2) = 3.32 m/s **2. (5pts) A 6.00-kg block is attached to a horizontal spring with a force constant of  200 N/m. Another block with a mass of 4.00-kg is pushed against the 6-kg block,  compressing the spring by the amount of 0.200 m. The system is then released from  rest. The two blocks move back to the equilibrium point together, and then the 4-kg 
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qz9sm08sol - August1,2008 PHY2053Discussion...

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