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PHYS171_f11_lecture_41

# PHYS171_f11_lecture_41 - PHYS171 Test was A h o r r o r R e...

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Unformatted text preview: PHYS171 Test was A h o r r o r R e a s o n a b l e e a s y 63% 5% 32% 1. A horror 2. Reasonable 3. easy Chapter 11 Angular Momentum – summing up dt L d r r = τ ω φ I mvr p r L = = × = sin r r r ω I If there is no external torque, the angular momentum of the system is conserved. final init L L = Chapter 11 Angular momentum of linear motion dt L d r r = τ ⊥ = = × = mvr mvr p r L φ sin r r r p r φ r ⊥ φ r r ⊥ r r φ φ sin r r = ⊥ Rotating mass demo. Is kinetic energy conserved? Y e s N o 56% 44% 1. Yes 2. No Rotating mass demo. Is angular momentum conserved? Y e s N o 7% 93% 1. Yes 2. No Chapter 11 HW Problem (on paper, for Tuesday) A puck of mass m is attached to a cord that passes through a hold in a horizontal frictionless surface. The puck is originally moving in a circle of radius r i and speed v i . The cord is then slowly pulled from below, decreasing to circle to radius r . What is the speed of the puck and the tension when we reach the final radius. How much work is done by the...
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PHYS171_f11_lecture_41 - PHYS171 Test was A h o r r o r R e...

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