EMCH_212_Final_FA11 - 1 The Pennsylvania State University...

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1 The Pennsylvania State UniversityDepartment of Engineering Science and MechanicsFALL 2011EMCH 212 FINAL EXAMDate : Wednesday 12/14/2011Time : 8:30 am – 11:15 am.Name :___________________________________ PSU ID# :____________ Section # :_______________ Answer all questionsIf needed take g as 9.8 m/s2or 32 ft/s2
2 [1]Blocks Aand B, weighing 7and 15 lb, are released from rest when the spring is unstretched. If all sources of friction are negligible and k = 12 lb/ft, determine the maximum vertical displacement of Bfrom the release position, assuming that Anever leaves the horizontal surface shown and the cord connecting Aand Bis inextensible(Total 25 points).
3 [2]A bar of length L = 2.5 mis falling so that, when θ= 34°,vA= 3 m/sand aA= 8.7 m/s2.

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