Two aluminium rods of circular cross-section 1 mm are stretched by means of a hanging weight 1200 N as shown in the figure. Assume that the rod material follows Hooke's Law and its Young's modulus is that of aluminium (E= 70 GPa ) .
1. What is the tension in the rods?
2. If the triangle ABC is equilateral, find the axial elongation of the rods.