h5 - luzon(jrl2375 – HW5 – Liu –(80440 1 This...

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Unformatted text preview: luzon (jrl2375) – HW5 – Liu – (80440) 1 This print-out should have 31 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. This assignment is due at 9:00PM Sept. 28, Mpnday, 2009. 001 (part 1 of 2) 10.0 points A spherical mass rests upon two wedges, as seen in the figure below. The sphere and the wedges are at rest and remain at rest. There is no friction between the sphere and the wedges. M The following figures show several attempts at drawing free-body diagrams for the sphere. Which figure has the correct directions for each force? The magnitudes of the forces are not necessarily drawn to scale. 1. weight 2. weight friction friction normal normal 3. weight normal normal 4. normal weight weight 5. normal normal weight weight 6. weight normal 7. Since the sphere is not moving, no forces act on it. 8. normal normal weight weight 9. weight normal normal 002 (part 2 of 2) 10.0 points The wedges themselves lie on a horizontal table. There is friction between the table and the wedges. The following figures show several attempts at drawing free-body diagrams for the left wedge. Which figure has the correct directions for each force? The magnitudes of the forces are not necessarily drawn to scale. luzon (jrl2375) – HW5 – Liu – (80440) 2 1. normal weight F s p h e r e 2. normal weight friction F s p h e r e 3. Since the sphere is not moving, no forces act on it. 4. normal weight F sphere f r i c t i o n 5. normal weight F sphere f r i c t i o n 6. normal weight F s p h e r e 7. normal weight friction F s p h e r e 8. normal weight friction F s p h e r e 9. normal weight friction F s p h e r e 003 (part 1 of 2) 10.0 points A string is tied to a book and pulled at an angle α as shown in the diagram. The book remains in contact with the table and does not move. m μ s T α Which choice best describes the free body diagram in the vertical direction for this situ- ation? 1. N = mg + T cos α 2. N = mg + T sin α 3. N = mg- T sin α 4. N = mg 5. N = mg- T cos α luzon (jrl2375) – HW5 – Liu – (80440) 3 004 (part 2 of 2) 10.0 points Which forces must change in order for the book to start moving? 1. normal and gravitational 2. normal, friction, and tension in the string 3. None of these 4. gravitational 5. tension in the string 6. friction 7. friction, tension in the string, and gravi- tational 8. friction and tension in the string 9. normal 005 (part 1 of 4) 10.0 points A ladder leans against a wall while someone climbs up, as shown in the figure below. b W p W ℓ d ℓ b s A B Which way does the normal force point at position A ? 1. 2. None of these 3. 4. 5. 6. 7. 8. 9. 006 (part 2 of 4) 10.0 points Which way does the normal force point at position B?...
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h5 - luzon(jrl2375 – HW5 – Liu –(80440 1 This...

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