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11_25_Angular_Momentum

# 11_25_Angular_Momentum - There is no net torque on the...

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Physics 211 11/25 HW Handout Name______________________ Fall 2002 Angular Momentum Due Wednesday 12/4 1) A ring of mass m = 4kg and radius r = 0.2m is dropped onto a 12kg rotating disk with the same radius. After the “collision” they both have the same angular velocity. The moments of inertia are calculated below. Do this exactly like linear momentum except replace mv with I ϖ . Angular momentum is conserved if there is no net torque in the same way that linear momentum is conserved if there is no net force.
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Unformatted text preview: There is no net torque on the system here so the total I ϖ of the system is the same before and after. a) Find the final angular velocity of the system if the initial angular velocity of the ring is zero and the initial angular velocity of the disk is ϖ i = 20rad/s. Show your reasoning. ϖ i = 0 ϖ i = 20rad/s ϖ f = ? rotate together I ring = mr 2 = 0.16kg m 2 I disk = 1 / 2 mr 2 = 0.24kg m 2...
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