Consider an object of mass m that moves in a circular orbit with constant velocity v0 along the inside of a cone. Assume the wall of the cone to be frictionless. Find radius of the orbit.
(A) \(\frac{v_0^2}{g}\) tan2ϕ
(B) \(\frac{v_0^2}{g}\) cos2ϕ
(C) \(\frac{v_0^2}{g}\) tanϕ
(D) \(\frac{v_0^2}{g}\)