HW12S06 - Physics 112 Read Chapter 10(all Chapter...

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Physics 112 Homework #12 Spring 2006 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, April 22, 2006, at lecture: #11.74 [Stacking blocks] #10.39 [Block on String] #10.90 [Neutron Star Glitch] #10.43 [Parachuting onto a Turntable] #10.48 [Precessing Gyroscope] #10.57 [Exena the Exterminator] #10.99 [Tilted Gyroscope] (Hint – look at the end of your lab manual) 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?
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