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Conservation on Angular Momentum

  • Thread starter misskk24
  • Start date
4
0
A figure skater during her finale can increase her rotation rate from an initial rate of 1.02 revolutions every 2.08 s to a final rate of 3.05 revolutions per second. If her initial moment of inertia was 4.50 kg*m2, what is her final moment of inertia?
 

Answers and Replies

hage567
Homework Helper
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What have you tried so far? Please show us your work.
 
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:\

i'm bascially stuck
i have no idea where to begin
 
hage567
Homework Helper
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Can you state what the equation for angular momentum is? What does your textbook say?
 
4
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L=mvr

?
 
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but the inertia is I=(1/2)MR^2
 
hage567
Homework Helper
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You want this form

[tex]L = I\omega [/tex]

Is that one in your book? L is angular momentum, I is the moment of inertia, and [tex]\omega[/tex] is the angular speed.

Maybe look around here to learn about it: http://hyperphysics.phy-astr.gsu.edu/hbase/conser.html#conamo

but the inertia is I=(1/2)MR^2
You don't need this, since you were given the initial value of I directly in the question. You are trying to find the final value.

So if angular momentum is conserved, what will your equation look like?
 

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