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Written Homework 9 Solutions

# Written Homework 9 Solutions - Physics 221Fall2007...

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Physics 221Fall2007 Written Homework dueTuesday October 23 l-- A girl of mass 30 kg, running tangentially at a speed of 5.00 m/s, jumps onto a disk shaped, playground merry-go-round, initially at rest(see sketch below). (a) If the mass of the merry-go-round is 100 kg and it has a radius of 1.50 nU find the angular speed of the combined merry-go-round / girl system if the girl says on the edge. (b) Now the girl walks to the precise center of the merry-go-round. What is the angular velocity of the girl /merry-go-round system now? 5

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Physics 221 Fall2007 Written Homework due Tuesday October 23 2-- An ice skater spinning with an angular speed of I .50 rev/s is holding two, 10.0 kg masses out at aradius of 0.80 m from heraxis of symmetryusing hertwo arms (of negligible mass). The total moment of inertia of the skater and the two, 10.0 kg masses is 15.0 kg-.'. (a) Findthe moment of inertia of the skater herself. (b) If the two, 10.0 kg masses are brought in to a radius of 0.25 m, what is the new angular speed of the skater in revls? (c) If the two masses
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Written Homework 9 Solutions - Physics 221Fall2007...

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