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HW09_12

# HW09_12 - P1112 Spring 2009 Homework#12 due second section...

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P1112 Spring 2009 Homework #12 due second section of week of April 13. Solutions posted Friday April 17. Quiz on HW #12 first section of week of April 20. Reading: Chapter 10, 12.5 Not all concepts will be covered in class – you are responsible for all material in the reading and in the homework problems. Problems: 1. A uniform solid sphere of mass M and radius R rolls, without slipping, down a ramp that makes an angle θ with the horizontal. (a) What is the force of friction between the ramp and the sphere? (b) What is the minimum value of the coefficient of static friction needed so that the sphere can roll? 2 . Y&F 10.69 Yo-yo dynamics. 3 . 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 ! (a) Which of these physical quantities do you know are conserved in this collision, and which do you not know? Please explain your reasoning.

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