2_Sample1_MT2

# 2_Sample1_MT2 - 1 A trunk with a weight of 200 N rests on...

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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: 0 10 20 30 40 50 60 70 80 90 0 5 10 15 20 Tim e (s) Force (N) 0 10 20 30 40 50 60 70 80 90 0 5 10 15 20 Time (s) 0 10 20 30 40 50 60 70 80 90 0 5 10 15 20 Time (s) 0 10 20 30 40 50 60 70 80 90 0 5 10 15 20 Time (s) a) b) c) d) 0 10 20 30 40 50 60 70 80 90 0 5 10 15 20 Tim e (s) e) Page 1

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2) A 4.0 kg block is put on top of a 5.0 kg block. The coefficient of static friction between the two blocks is ! s = 0.23 . The assembly of blocks is placed on a horizontal, frictionless table as on the figure below. What is the magnitude of the maximum horizontal force F that can be applied to the lower block so that the blocks will move together without any slippage? . A) 9.00 N B) 11.27 N C) 16.08 N D) 20.25 N E) 88.29 N 3) A single force acts on a body that moves along a straight line. The figure shown is a plot of velocity vs. time for the body. During which time interval is the magnitude of the work done on the object largest ? A) AB ve locity vs. tim e 0 1 2 3 4 5 0 2 4 6 tim e (s) velocity (m/s) E F B A C D B) BC C) CD D) DE E) EF Page 2
4) As the figure below shows, a 4.4 kg block is accelerated by a compressed spring whose spring constant is 640 N/m. After leaving the spring at the spring's relaxed length, the block travels over a horizontal surface, with a coefficient of kinetic friction of 0.25, for a distance of 7.8 m before stopping. Through what distance was the spring compressed before the block began to move? A) 0.131 m B) 0.184 m C) 0.361 m D) 0.512 m E) Insufficient information has been provided 5) A mechanic pushes a 2500 kg car from rest to a speed V doing 2500 J of work in the process. During this time the car moves 25 m. Ignoring friction, the final velocity of the car is: A) 0.040 m/s B) 1.00 m/s C) 1.41 m/s D) 4.54 m/s E) 100.0 m/s Page 3

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6) A rough inclined slide is mounted on a railroad car, as shown on the figure below. The
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## This note was uploaded on 12/28/2010 for the course PHYS 211 taught by Professor Staff during the Fall '08 term at Penn State.

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2_Sample1_MT2 - 1 A trunk with a weight of 200 N rests on...

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