Thread: A coin in a funnel View Single Post
 P: 21 1. The problem statement, all variables and given/known data 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. 2. Relevant equations I thougth it must be $$\tan\alpha=\frac{v^2}{r\cdot g}$$ 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: Can u pls help me? Thank you 1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution Attached Thumbnails