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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) Force (N) C. 0 10 20 30 40 50 60 70 80 90 0 5 10 15 20 Time (s) Force (N) D. 0 10 20 30 40 50 60 70 80 90 0 5 10 15 20 Time (s) Force (N) E. 0 10 20 30 40 50 60 70 80 90 0 5 10 15 20 Time (s) Force (N) 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.
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