ANSWERS - numbers It is your responsibility to convince the...

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Answers to PH-131 Fall 2006 Exam 1 This document does not contain the solution to each of the problems. It contains only the final answers. Use the exam as a timed practice test and check your answers . You may check your solutions with any of the TAs. Remember that you will be graded on your ability to clearly document a formal solution to each problem. All starting equations and algebraic manipulations should be shown clearly. Numbers should be plugged in last. The numbers you are using should be clearly documented. Final answers (with appropriate units) should be boxed or circled. Final answers (even if correct) without an appropriate solution will receive zero credit. If you are not sure how to arrive at the answer to part of a problem, show as much work as possible to receive partial credit. Your work must show a logical progression from one step to the next. Do not write random equations and
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Unformatted text preview: numbers. It is your responsibility to convince the grader that you know what you are doing. Multiple Choice Answers: 1) C 2) D 3) B 4) B 5) B 6) C 7) C 8) A 9) D 10) B Problem 1: For the given reference frame: a) 2.0 m/s b) At snow level, Ball A is moving at 14.7 m/s and Ball B is moving at 16.7 m/s Ball A will undergo a displacement of 0.65 m, while ball B will undergo a displacement of 0.84 m. c) See a TA for graph. BONUS: 8.0 m/s Problem 2: For the given reference frame: a) The position of the snowball at apex (t = 1.51 s) is m j i r ) ˆ 31 ˆ 27 ( + = v . The velocity at is s m i v ) ˆ 18 ( = v . The acceleration is 2 ) ˆ 8 . 9 ( s m j a-= v . b) When y=0, x sled = x ball = 70.9 m. Acceleration of sled: a = -4.9 m/s 2 . So, he should slow down. c) ( 29 s m j i v BALL ˆ . 5 ˆ 18-= v BONUS: The speed of the ball is 30 m/s at an angle of o 54 below the horizontal....
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