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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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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