Kinetic Energy of Rotating Bodies

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Jurgen Active Contributor Join Date: Jun 2011 Posts: 11	Kinetic Energy of Rotating Bodies 07/05/2013 2:04 AM
	Hello, I need to calculate the kinetic energy of a rotating table. Wikipedia explains extensive about bodies moving in straight line but very little about rotating bodies. The formula given is Er = 0.5 * I * w square where w is angular velocity. I've got the moment of inertia (I = 47410 kg mmsq) from my CAD system but what do I need for w? The unit for I is kg cm square and the Energy in Joule is kg cm square. How can they be both the same? The air motor I would like to use has a maximum kinetic energy of 750 Joule. Thank you.
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#1 Re: Kinetic energy of rotating bodies 07/05/2013 3:19 AM
	w is the angular velocity, i.e. angle per unit time. In MKS units, it is radians per second. Plug that in, and the energy comes out in Joules. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#3 In reply to #1 Re: Kinetic energy of rotating bodies 07/09/2013 6:36 AM
	Correction: plug that in and convert the MoI to MKS units.... __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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Shyam Guru Join Date: Aug 2006 Location: AM-51, Deen Dayal Nagar, Gwalior, Madhya Pradesh, MP 474001, India Posts: 3418 Good Answers: 32	#2 Re: Kinetic Energy of Rotating Bodies 07/06/2013 12:33 AM
	Rotational Kinetic Energy comes from applied torque (coupled forces applied at separate points from opposite direction) and linear kinetic energy comes from applied force. Energy remains as energy in whatever form it may. __________________ Prof. (Dr.) Shyam, Managing Director for Sensors Technology Private Limited. Gwalior, MP474001, India.
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