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cicular motion

 
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ptejav



Joined: 08 Sep 2010
Posts: 3
Location: INDIA

PostPosted: Tue Sep 14, 2010 3:43 am    Post subject: cicular motion Reply with quote

A particle moves with a constant angular acceleration Alpha in a circular path. The time at which the magnitude of tangential and radial accelerations are equal is
a) 1/Alpha b) Sq.root Alpha c) 1/Sq.root Alpha d) Alpha

Please explain[/code][/list]
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hepcj
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Joined: 23 Jun 2007
Posts: 125

PostPosted: Thu Sep 16, 2010 3:09 pm    Post subject: Reply with quote

I would use dimensional analysis. You want the answer to come out in seconds and you know that the angular acceleration is measured in rad s^-2. (radians don't have a dimensional unit as they are a measurement of angle.)
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