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## Homework Statement

if you start a coin rolling on a table with care , u can make it roll in a circle.The coin will lean inward with its axis tilted. The radius of the coin is b.The radius of the circle it follows on the table is R and its velocity is v.assume no slipping.find the angle that axis of coin makes with horizontal.

(source- klepner kolenkow 7.6)

## Homework Equations

i think they are f(centripetal)=mv^2/R, F(friction)=mew N and torque balance

## The Attempt at a Solution

mew mg = mv^2/R

and torque balance gives N R sin theta=F(fric)R cos theta

gives tan theta=mew=v^2/Rg

but the answer is given tan theta= 3v^2/2Rg !!!!