b and c please

Problem 1: Energy of bending a rod When one bends a long, thin rod of original length Lo, as shown in the figure to the right, the rod stores some elastic potential energy. This energy can be written in terms of the bending angle 0: 1 bc02 Uel = 2 Lo A. Use the definition of the cylindrical bending coefficient to rewrite the elastic energy Uer in terms of the radius of the rod r (NOT the radius of curvature of the bend). AL = O Vel = 2 bck x tan D RC Lo = unchanged tan D = Lo Lo = tan RC RC B. Suppose two rods have the same Uel, 0, and Lo. If r1 = = 12, how would the Young's modulus Y, compare to Yz? C. Rod 1 is bent into a quarter-circle, and rod 2 is bent into a half-circle. How does Uel,1 compare to Uel,2