FA2003MT2 - Physics 211 Midterm 2 Fall 2003 Form E 1. A...

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Physics 211 Midterm 2 Fall 2003 Form E 1. A trunk with a weight of 200 N rests on the floor. The coefficient of static friction between the trunk and the floor is 0.40, while the coefficient of kinetic friction is 0.15. If a person begins pushing on the crate at time t = 0s to eventually start it sliding at constant speed across the floor beginning at time t =10s, a graph of the force applied by the person as a function of time might be: A. 0 10 20 30 40 50 60 70 80 90 0 5 10 15 20 Time (s) Force (N) B. 0 10 20 30 40 50 60 70 80 90 0 5 10 15 20 Time (s) C. 0 10 20 30 40 50 60 70 80 90 0 5 10 15 20 D. 0 10 20 30 40 50 60 70 80 90 0 5 10 15 20 E. 0 10 20 30 40 50 60 70 80 90 0 5 10 15 20 Page 1, v5
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Physics 211 Midterm 2 Fall 2003 Form E 2. A mechanic pushes a 2500 kg car from rest to a speed of v doing 5000 J of work in the process. During this time the car moves 25 m. Ignoring friction, the final velocity of the car is: A. 2 m/s B. 122.5 m/s C. 4 m/s D. 200 m/s E. 100 m/s 3. In the following situation, a force F pulls on the lower block M. A horizontal rope fastens the upper block m to the wall (the tension in the rope is T). The two blocks and the floor are made of wood. The coefficient of kinetic friction for wood rubbing against wood is µ K and that for static friction is µ S . Which of the following statements is false ? m M F A. If M is not moving, then F < µ S (2m+M)g . B. If M is not moving, the tension T in the rope is equal to F. C. The vertical force exerted on M by m is equal to mg. D. If M is moving at constant speed, then F = µ K (2m+M)g. E. The vertical force exerted on M by the ground is equal to (M+m)g. 4. A 1900 kg block of granite is pulled up an incline 30 meter high and 40 meters in horizontal length at a constant speed of 1.35 m/s by a cable and winch. The coefficient of kinetic friction between the block and the incline is 0.45. What is the power due to the force applied to the block by the cable?
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This note was uploaded on 10/31/2010 for the course PHYS 211 at Pennsylvania State University, University Park.

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FA2003MT2 - Physics 211 Midterm 2 Fall 2003 Form E 1. A...

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