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# 4.3 - MasteringPhysics Assignment Print View...

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Ch4_3 Due: 10:00pm on Friday, September 24, 2010 Note: You will receive no credit for late submissions. To learn more, read your instructor's Grading Policy [ Switch to Standard Assignment View] A Message from Your Instructor: You should make a serious attempt at these problems before your September 24 workshop. You only have a couple of hours after the work shop to make final adjustments before the due time !! You will do poorly in the work shop if you are unprepared. !! If you need help consult the Help Blog and/or visit the help room. Multiple Choice Question 5.30 The two blocks in the figure are at rest on frictionless surfaces. Part A What must be the mass of the right block in order that the two blocks remain stationary? ANSWER: 4.9 6.1 7.9 9.8 12 Correct Two Masses, a Pulley, and an Inclined Plane Block 1, of mass = 0.550 , is connected over an ideal (massless and frictionless) pulley to block 2, of mass , as shown. Assume that the blocks accelerate as shown with an acceleration of magnitude = 0.200 and that the coefficient of kinetic friction between block 2 and the plane is = 0.200. Part A Find the mass of block 2, , when = 30.0 . Hint A.1 Draw a free-body diagram Which figure depicts the correct free-body diagrams for the blocks in this problem? Figure a MasteringPhysics: Assignment Print View http://session.masteringphysics.com/myct/assignmentPrintView?assignme. .. 1 of 6 9/25/2010 4:18 PM

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Figure b Figure c The notation in the figures is as follows: is the tension in the string, is the normal force between block 2 and the surface of the incline, is the friction force, is the acceleration of the blocks, and is the magnitude of the acceleration due to gravity. ANSWER:
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