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ef152-lec-1-5

ef152-lec-1-5 - Module 1 Lecture 5 Given A 2 m long 90 N...

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EF 152 Fall, 2008 Lecture 1-5 1 Module 1, Lecture 5 Given: A 2 m long 90 N plank hangs vertically from a frictionless hinge. The plank is struck 1.5 m below the hinge by a 3 kg ball traveling at 10 m/s. The ball rebounds at 6 m/s. Required: Angular velocity of the plank. Why is linear momentum not conserved? EF 152 Fall, 2008 Lecture 1-5 2 Example: Spinning bicycle wheel I Xu is holding the spinning bicycle wheel while standing on a platform that can rotate freely. Suddenly he flips the bicycle wheel over so it is spinning in the opposite direction. What happens? A. Platform starts rotating in direction wheel was originally rotating B. Platform starts rotating in opposite direction of original wheel rotation C. Platform stays at rest D. Platform turns only while Xu is flipping the wheel Now he moves the wheel only 90° so it is vertical. What happens ? A. Platform starts rotating in same direction and speed as before B. Platform starts rotating in same direction as before, but at a slower speed C. Platform stays at rest D.

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ef152-lec-1-5 - Module 1 Lecture 5 Given A 2 m long 90 N...

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