Final_exam_v4A_solns - Physics 2210 NAME Fall Semester 2015 UID NUMBER Final Exam Version A TA NAME Tuesday Discussion Day(circle one M\/W T\/TH Academic

Final_exam_v4A_solns - Physics 2210 NAME Fall Semester 2015...

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Physics 2210 NAME: _____________________________________________ Fall Semester 2015 UID NUMBER: _______________________________________ Final Exam, Version A TA NAME: __________________________________________ Tuesday, December 15, 2015 Discussion Day (circle one): M/W T/TH Academic Integrity: Giving assistance to or receiving assistance from another student or using unauthorized materials during a University Examination can be grounds for disciplinary action, up to and including dismissal from the University. Honor pledge: On my honor as a University of Utah student, I have neither given nor received unauthorized assistance on any part of this exam. ______________________________ ______________________________ ____________ Name (please print) Signature Date Instructions 1) Use a pencil to fill in the circles corresponding to your name and UID on the answer sheet. 2) In the space above, write your name, UID#, TA name, and circle your discussion days. 3) Sign and date the honor pledge above. 4) Use a pencil to fill in the circles on the answer sheet that match your answer choices. 5) Each problem has only one correct answer, but you can select more than one answer for partial credit on questions that have 5 choices (MC5): see the grading scheme below. 6) Circle your answers in the exam booklet ALSO as a backup to the answer sheet. 7) Use the space provided in the exam booklet to work out your problems. If you need more space, we can provide scratch paper. 8)Bring your completed exam booklet and answer sheet to the front of the classroom along with your UID card. Your UID card must match your face and the name on your exam to receive a grade. Grading Scheme MC5: multiple-choice-five-answer questions, each worth 6 points. Partial credit will be granted as follows: (a) If you mark only oneanswer and it is the correct answer, you earn 6points. (b) If you mark twoanswers, one of which is the correct answer, you earn 3points. (c) If you mark noanswers, or more thantwo, you earn 0points. MC3 and MC4: multiple-choice-three-answer (3 points) or four-answer (4 points) questions. No partial credit. Choose only one answer! T/F: true or false questions, each worth 2 points. No partial credit. Choose only one answer!
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2 Scenario 1: A stick which can rotate around a stationary vertical rod can be used to measure the speed of a bullet. The stick is mounted onto the rod by drilling a hole near the end of the stick of the same diameter as the rod so that when the stick rotates, the two surfaces slide against each other. If the coeffecient of kinetic friction between these two surfaces is assumed to be constant, then there is a constant dissipative torque acting on the stick while it rotates. During the collision, the bullet embeds completely into the end of the stick . The ultimate goal is to find the speed of the bullet given information about the rotation of the stick after the collision . ( The stick can rotate on the rod, but it cannot slide down the rod.) Understand the Physics (select only one answer): 1. [2 points] To calculate the angular speed of the stick+bullet system just after the collision, we consider the situation just before and just after the bullet embeds into the stick. At these two moments in time, the
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