Pro~lems and Solutions on Mechanics Major American Universities Ph.D. Q u a l i f ~ ~ n ~ Questions and Solutions Problems and Solutions on Mechanics C o ~ ~ i l ~ d by: The Physics Coaching Class University of Science and Technology of China Refereed by: ~iangYuan-qi, Gu En-pu, Cheng Jia-fu, ti Ze-hua,Ylang De-tian Edited by: Lirn Yung-kuo World Scientific ~ e ~ ~ e ~ s ~ y e ~ o f f d o ~ 'Singapore e ~ ~ n g ~ o n g Pub~j.~he(/ hy World Scienrific Publishing Co. Pte. 1-td 5 Toh Tuck Link, Singapore 596224 (A'A @c,e; Suite 202, 1060 Main Street, Kivcr Wge, NJ 07661 UK