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HW__12_F05

# HW__12_F05 - Physics 112 Read Chapter 10(all Chapter...

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Physics 112 Homework #12 Fall 2005 Read: Chapter 10 (all) Chapter 12 (section 12.5) For discussion: Chapter 10: Qs #Q10.20, Q10.21, Q10.22, Q10.24, Q 10.25, Q10.27, Q10.30 (not turned in) Chapter 10: Es & Ps: #10.35, 10.45, 10.47, 10.50, 10.70, 10.89, 10.91, 10.99 Chapter 12: Es & Ps #12.74 Due Friday, Nov. 18, at lecture: #11.78 [Dragging a Hay Bale] #10.39 [Block on String] #10.40 [Spinning Figure Skater] #10.43 [Parachuting onto a Turntable] #10.48 [Precessing Gyroscope] #10.57 [Exena the Exterminator] 1. ["Sweet Spot" of a Stick] A small ball of mass m moving at speed v o on horizontal frictionless surface collides with a uniform stick of mass M and length D initially at rest and rebounds with speed v f . CM D b m M v o CM v f v CM ω Before After (a) Which of these physical quantities do you know are conserved in this collision, and which do you not know? Please explain your reasoning. Linear Momentum Kinetic Energy Angular Momentum (b) In terms of v o and v f , what is the final speed v CM of the stick's CM? (c) In terms of v o and v f , what is the stick's final rotational speed ω ?

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