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MasteringPhysics-ch 5 - MasteringPhysics Assignment Print...

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MasteringPhysics: Assignment Print View http://session.masteringphysics.com/myct/assignmentPrint?assignm... 1 of 18 10/20/07 10:59 PM [ Print View ] physics 2211 MP05: Chapter 5 Due at 5:30pm on Monday, October 1, 2007 View Grading Details PSS 5.1: Don't Rock the Block Learning Goal: To practice Problem-Solving Strategy 5.1 for equilibrium problems. A pair of students are lifting a heavy trunk on move-in day . Using two ropes tied to a small ring at the center of the top of the trunk, they pull the trunk straight up at a constant velocity . Each rope makes an angle with respect to the vertical. The magnitude of the weight of the trunk is . Find the tension in each rope. MODEL: Make simplifying assumptions. VISUALIZE: Physical representation--Identify all forces acting on the object and show them on a free-body diagram. Pictorial representation--The free-body diagram is usually sufficient as a picture for equilibrium problems, but you still must translate words into symbols and identify what the problem is trying to find. It is acceptable practice to go back and forth between these two steps as you visualize the situation. SOLVE: The mathematical representation is based on Newton's 1st law: The vector sum of the forces is found directly from the free-body diagram. ASSESS: Check if your result has the correct units, is reasonable, and answers the question. Model Start by choosing an appropriate model for the problem and by making appropriate simplifying assumptions. [ Print ]
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MasteringPhysics: Assignment Print View http://session.masteringphysics.com/myct/assignmentPrint?assignm... 2 of 18 10/20/07 10:59 PM Part A In this problem, the trunk should be modeled as ANSWER: a particle in static equilibrium. a particle in dynamic equilibrium. a particle not in equilibrium. Despite the fact that , the velocity of the trunk is constant . Therefore, the acceleration of the trunk is zero, and the trunk is in dynamic equilibrium. Part B Does your model of this problem need to include air resistance? ANSWER: yes no Visualize Draw a free-body diagram that includes all the forces acting on the trunk. Use a coordinate system with the y axis vertical and the ropes both in the xy plane. Use your diagram to answer the following question. Part C How many forces are acting on the trunk? ANSWER: one two three four Part D Which of the following statements are correct? The x component of the weight of the trunk is zero. A. The y component of the weight of the trunk is zero. B. The x components of the forces of tension in the ropes have the same magnitude and sign. C. The x components of the forces of tension in the ropes have the same magnitude and opposite sign. D. The y components of the forces of tension in the ropes have the same magnitude and sign. E. The y components of the forces of tension in the ropes have the same magnitude and opposite sign. F.
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