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Kinetic Energy Of an rotating object!

 
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Oct13-08, 09:40 PM   #1
 

Kinetic Energy Of an rotating object!

1. A 75-g phonograph album of 30-cm diameter spins at 33.3 rpm. What is its kinetic energy?
 
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Oct13-08, 09:42 PM   #2
 
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Quote by Duely Cack View Post
1. A 75-g phonograph album of 30-cm diameter spins at 33.3 rpm. What is its kinetic energy?
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What are your thoughts on how to go about solving it.
 
Oct13-08, 09:45 PM   #3
 
well i think that Kinetic Energy is 1/2mv2so is it like that but instead of v you put in the 33.3 rpm. like 1/2(75)(33.3)2 maybe?
 
Oct13-08, 09:54 PM   #4
 

Kinetic Energy Of an rotating object!

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Oct13-08, 11:40 PM   #5
 
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Quote by Duely Cack View Post
well i think that Kinetic Energy is 1/2mv2so is it like that but instead of v you put in the 33.3 rpm. like 1/2(75)(33.3)2 maybe?
What is the moment of inertia of the phonograph?

Using the moment of inertia what is the formula then for rotational kinetic energy?
 
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diameter, kinetic energy, mass, rotating object, rpm
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