Ang_Momentum I

# Ang_Momentum I - Angular Momentum I 1. An ice skater is...

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Angular Momentum I 1. An ice skater is rotating with one leg outward and her arms outward. She then pulls her arms inward and her leg inward toward the axis of rotation. As a result, her angular speed (a) increases (b) decreases (c) remains constant 2. Barbell A has 10 kg weights at each end and is 3 m long. Barbell B has 20 kg weights at each end and is 1.5 m long. Which barbell has a greater moment of inertia if rotating about its center of mass? (assume the bar’s mass is negligible) (a) barbell A (b) barbell B (c) they have the same moment of inertia (d) not enough information is given 3.A uniform density disk whose mass is 10 kg and radius 0.4 m makes one complete rotation every 0.2s. What is the kinetic energy? I = 0.5MR 2 4.A barbell spins around a pivot at its center at A. The barbell consists of two small balls, each with mass m, at the ends of a very low mass rod of length d. The barbell spins clockwise with angular speed ϖ 0 rad/s. a) Calculate L trans,1,A b) Calculate L tot,1,A c) Calculate I for the barbell d) Calculate L rot e) Calculate K rot I have a great idea for a “catching-machine” that catches a baseball and tells you the speed of the ball based on how fast it’s rotating. The machine consists of very lightweight aluminum rods (they are so light that you can neglect their mass) connected to massive objects with nets at the ends, 2.0 m from the center, that catch the baseball. The mass of each object at the end of a rod that

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## This note was uploaded on 02/24/2010 for the course PHY 303K taught by Professor Turner during the Fall '08 term at University of Texas at Austin.

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Ang_Momentum I - Angular Momentum I 1. An ice skater is...

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