1. The problem statement, all variables and given/known data Kleppner & Kolenkow 7.7 A thin hoop of mass M and radius R is suspended from a string through a point on the rim of the hoop. If the support is turned with high angular velocity [tex]\omega[/tex], the hoop will spin as shown, with its plane nearly horizontal and its center nearly on the axis of the support. The string makes angle [tex]\alpha[/tex] with the vertical. Find, approximately, the small angle ([tex]\beta[/tex] between the plane of the hoop and the horizontal. 2. Relevant equations 3. The attempt at a solution torque = RMg cos[tex]\beta[/tex] angular momentum = I[tex]\omega[/tex] I don't know how to link these equations. I'm not really sure if this is a gyroscope problem to use its formula. Can anyone help me please? And one question, how do I determine if a system is precessing, means it's a gyroscopic problem or not? Thanks!