Phys211Final Exam Sample 2 with key - PHYS 211 FINAL FALL...

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PHYS 211 FINAL FALL 2004 Form A 56/1 1. Two boys with masses of 40 kg and 60 kg are holding onto either end of a 10 m long massless pole which is initially at rest and floating in still water. They pull themselves along the pole toward each other until they meet. When they do meet, the 40 kg boy will have moved approximately how far relative to a stationary 300 kg toad on the shore: A. 4.0 m B. 5.0 m C. 6.0 m D. 10 m E. You can't tell because you don't know how hard each boy pulls. 72/4 2. The symbol for infinity can be made out of two uniform circular wire loops of radius R and mass M as shown. What is its moment of inertia around an axis perpendicular to the page and through the point O? O A. 2MR 2 4MR 2 C. 6MR 2 D. 8MR 2 12MR 2 Page 1
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PHYS 211 FINAL FALL 2004 Form A 72/8 3. You are shown four objects: Object #1 is a hollow cylinder of mass 4 kg and radius R = 4 m and length L = 2 m Object #2 is a hollow cylinder of mass 4 kg and radius R = 2 m and length L = 4 m Object #3 is a solid cylinder of mass 4 kg and radius R = 2 m and length L = 4 m Object #4 is a hollow cylinder of mass 8 kg and radius R = 2 m and length L = 8 m Rank these objects in order of increasing rotational rotational inertia (from smallest to biggest): L R A. 3,2,1,4 B. 3,2,4,1 C. 1,4,2,3 D. 4,1,2,3 E. 2,3,1,4 31/7 4. A heavy wooden block is dragged by a force F along a rough steel plate, as shown for two cases. The magnitude of the applied force F is the same for both cases. The normal force in (ii), as compared with the normal force in (i) is: F F i ii A. the same. greater. C. less. D. less for some angles of the incline and greater for others. less or greater, depending on the magnitude of the applied force F. Page 2
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PHYS 211 FINAL FALL 2004 Form A 37/8 5. The diagram below shows a simple pendulum consisting of a mass M suspended by a thin string. The magnitude of the tension is T. The mass swings back and forth between ± θ 0 . Which of the following statements is false ? A. T depends on θ . B. T is largest at the bottom θ = 0. C. T equals Mg when θ = θ 0 . D. T is smallest when θ = ± θ 0 . E. T=Mg at some angle between zero and θ 0 . 35/17 6. The coefficient of kinetic friction in the figure below is μ k = 0.90, and the slope angle is 60°. What is the magnitude of the acceleration of the block ( parallel to the surface) if it has been given an upward shove and is still sliding up the slope? Remember that sin(60°) = 0.866 and cos(60°) = 0.5 .
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This note was uploaded on 03/02/2008 for the course PHYS 213 taught by Professor Staff during the Spring '08 term at Pennsylvania State University, University Park.

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Phys211Final Exam Sample 2 with key - PHYS 211 FINAL FALL...

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