3:09 PM Sun Oct 23 u. a? 1.. n 25%:1 Done David Morin - Introduction to classical mechanics_ with problems and solutions (2008, Cambridge University Pr... Open in Notability Q 5.45. Keeping contact *4: A frictionless circle of radius R is made out of a strip of metal and held xed in a vertical plane. Amassless spring with spring constant k has one end attached to the bottom point on the inside surface of the circle, and the other end attached to a mass m. The spring is compressed to zero length, 183 with the mass touching the inside surface of the circle at the bottom. (Whatever negligible length of spring remains is essentially horizontal.) The spring is then released, and the mass gets pushed initially to the right and then up along the circle; the setup at a random later time is \\ , shown in Fig. 5.33. Let 6 be the equilibrium length of the spring. What .7. is the minimum value of 6 for which the mass remains in contact with the circle at all times? i -a .9 v \"empty, Fig. 5.33