Physics 201 final 1

Physics 201 final 1 - Physics 201, Final Exam, Fall 2006...

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Physics 201, Final Exam, Fall 2006 Key 1) A ball is thrown straight up in the air and it drops down to its initial position. For the time the ball is in the air, which of the following statements is true? A. Both average acceleration and average velocity are zero. B. Average acceleration is zero but average velocity is not zero. C. Average velocity is zero but average acceleration is not zero. D. Neither average acceleration nor average velocity is zero. E. Acceleration is opposite in the direction of velocity during the whole flight. 2) A block slides down an inclined plane with kinetic frictional coefficient k =0.01. If the mass of the block is 1 kg and the angle of the inclined plane is 45 o , the speed of the block A. decreases with time, till it stops. B. decreases with time till it achieves terminal velocity and then stays constant. C. stays constant. D. increases with time at a constant rate. E. increases with time till it reaches terminal velocity and then stays constant. 3) A fireman stays as far away from the blazing building as possible and also aim the stream of water from his firehouse at the highest point it can possibly reach on the building. He notices that he can reach the 10 th floor, which he estimates to be 30m high. What is the speed of the water coming out of the hose? A. 68 m/s B. 34 m/s C. 17 m/s D. 8.5 m/s E. It is not possible to determine the water speed without additional information 4) Two objects of unequal masses are hanging on the two ends of a string slung over a frictionless pulley supported on the ceiling. The tension in the string is A. m 1 + m 2 (29 g B. m 1 ! m 2 (29 g C. m 1 m 2 m 1 + m 2 (29 g D. 2 m 1 m 2 m 1 + m 2 (29 g E. None of the above 5) A stone of mass m is attached to a string of negligible mass and is being spun at constant speed v in a vertical circle of radius R . The tension in the string at the top, bottom and at 45 o angles, with the vertical direction are: A. T top = T bot = m
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v 2 R ; T 45 o = m v 2 R ! g 2 2200 # 5 % B. T top = T bot = m v 2 R ; T 45 o = m v 2 R + g 2 ! 2200# 5 C. T top = m v 2 R + g ! 2200# 5 ; T bot = m v 2 R 220d g ! 2200#
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5 ; T 45 o = m v 2 R ± g 2 ! 2200# 5 D. T top = m v 2 R ! g 2200 # 5 % ; T bot = m v 2 R + g 2200 # 5 % ; T 45 o = m v 2 R ± g 2 2200 # 5 % E. None of the above
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6) A dart is loaded into a spring-loaded toy dart gun by pushing the spring in by a distance d . For the next loading, the spring is compressed a distance
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Physics 201 final 1 - Physics 201, Final Exam, Fall 2006...

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