2 Questions for Quiz 2 - Statics - Fall 2009 | ECS 221, Exams of Statics

Download 2 Questions for Quiz 2 - Statics - Fall 2009 | ECS 221 and more Exams Statics in PDF only on Docsity! ECS221 Test 1 Spring 2009 Closed book – time: 50 min – grading: 10+10 No calculators 1. Two forces of the same magnitude P act on a cube of side a as shown. (a) Specify the equivalent force-couple at C. (b) Can this system be equivalent to a single force intersecting the plane y=0 ? (justify your answer, of course.) 2. The small sphere (negligible radius) of mass m is attached to a string of length L and rests on the smooth surface (no friction) of a fixed sphere of radius R. The center of the sphere is directly below the point where the string is attached. Determine the tension in the string (a) by using the law of sines and (b) by using cartesian components.