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Unformatted text preview: 4/28/08 3:02 PM MasteringPhysics: Assignment Print View Page 1 of 3 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1114167 [ Print View ] PHYS 2211 ABCDE Spring 08 MP45: Nonconservative Forces, Power Due at 11:59pm on Thursday, April 3, 2008 View Grading Details Dragging a Board A uniform board of length and mass lies near a boundary that separates two regions. In region 1, the coefficient of kinetic friction between the board and the surface is , and in region 2, the coefficient is . The positive direction is shown in the figure. Part A Find the net work done by friction in pulling the board directly from region 1 to region 2. Assume that the board moves at constant velocity. Part A.1 The net force of friction Part not displayed Part A.2 Work as integral of force Part not displayed Hint A.3 Direction of force of friction Hint not displayed Hint A.4 Formula for Hint not displayed Express the net work in terms of , , , , and . ANSWER: = This answer makes sense because it is as if the board spent half its time in region 1, and half in region 2, which on...
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