Physics Help Forum Circular motion

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 Oct 23rd 2017, 06:19 AM #1 Junior Member   Join Date: Oct 2017 Posts: 3 Circular motion A body is moving on a circle of radius 80m with a speed of 20m/s which is decreasing at the rate 5 m/sec^2 at an instant. The angle made by its acceleration with its velocity is ? Tangential acceleration = 5 m/s^2 Centripetal acceleration = v^2 / r = 5 Angle btw them alpha = 45 degree How do I find angle btw omega and centripetal acceleration ??
Oct 23rd 2017, 06:59 AM   #2

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 Originally Posted by vaDi999 A body is moving on a circle of radius 80m with a speed of 20m/s which is decreasing at the rate 5 m/sec^2 at an instant. The angle made by its acceleration with its velocity is ? Tangential acceleration = 5 m/s^2 Centripetal acceleration = v^2 / r = 5 Angle btw them alpha = 45 degree How do I find angle btw omega and centripetal acceleration ??
Hint: $\displaystyle v = r \omega$ where v is the tangential speed, which you were given. Can you think of a relationship between a and $\displaystyle \alpha$?

-Dan
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