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20th October 2010 - 03:34 PM
A coin(radius=r) rolls in a funnel only with a horizontal speed v. The coin always stays at his altitude.
The coin has a homogen mass distribution and it only rolls! So it has a translational motion and a rotation motion.
Find a function R(z) whitch discribes the form of the funnel!
R>>r and z is the altitude of the funnel. the z-coordinate of the coin is changeless.
I thougth it must be tan(a)=v˛/(r*g)
But then i tought the speed at all parts of the coin isnt the same.
If there are any questions in understand my problem, ask!
I made a drawing of that:
Pls Help me.
21st October 2010 - 01:48 PM
I found a vid of my effect.
But i dont know how can i get the form of the funnel. I need a function which discribes the form of the funnel.
In youtube you have to search for coin funnel
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