关键词: 1985年, CUSPEA试题, 英文, 物理

Abstract: Three identical cylinders rotate with the same angular velocity （Ω） about parallel central axes. Thgy are brought together until they touch, keeping the axes parallel. A new steady state is achieved when, at each contact line, a cylinder does not slip with crespect to its neighbor. How much of the original spin kinetic energy is now left？ （Thee precise order in which the first and second touch and the second and third touch is irrelevant）.