The light right-angle boom which supports the 400-kg cylinder is supported by three cables and a ball-and -socket joint at O attached to the vertical x-y surface. Determine the reactions at O and the cable tensions.

A long, thin, wire of uniform cross-section has Young's Modulus Y and mass density D. When laid horizontally on a bench its unstretched length is L. One end is attached to a fixed point and the rest of the wire is allowed to hang freely and vertically in the earth's gravitational field. Find the extension of the lowest end of the wire (i.e., the wire's length additional to L) due to gravitational force. The acceleration due to gravity is g.

hurry up