Question:
A 6-kg weight is fastened to the end of a steel wire of unstreched length 60 cm. It is whirled in a vertical circle and has an angular velocity of 2 revolution per second at the bottom of the circle. The area of cross-section of the wire is 0.05cm2. The elongation of the wire when the weight is at the lowest point of the path is (Ysteel=2×1011Pa)