MidTerm1

# MidTerm1 - PHY 126-07 Mid-term Exam I Chapters 9,10,11,1314...

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PHY 126-07 Mid-term Exam I Chapters 9,10,11,1314 You need to write how you have derived the answers. Just writing an answer does not get you the full point. When you use symbols that you define, make clear what these symbols represent. You are required to do Problem 1, Problem3 AND one of Problem 2A and 2B. Problem 1 (10+10 points) ω R A puck of mass m slides in a circular path on a horizontal frictionless table. It is held at a constant radius R by a string threaded through a frictionless hole at the center of the table. When you pull on the string such that the radius decreases by a factor of 3: (a) By what factor does the angular velocity of the puck increase? (b) By what factor does the tension of the string decrease?

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Problem 2A (5+5+10 points) θ max A bullet with mass m traveling horizontally with speed v i hits the bottom end of a rod of length L and mass M that is pivoted at the top end and at rest vertically before the collision. After the collision the bullet continues to travel
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MidTerm1 - PHY 126-07 Mid-term Exam I Chapters 9,10,11,1314...

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