4. If the work required to stretch a spring 10m is 100J, then the first step necessary to find k is: 3 pts a) Convert m to cm b) Integrate kx from 0 to 10 c) Divide 100 J by 10m d) Convert J to N 5. A solid is generated by rotating the shaded region in the figure below about a line. Match each formula to the line of rotation. Indicate whether each formula represents the washer or shells method. 8 pts J 1.2- 1.- 0.8- y=x 0.6- 0.4 0.2 y= x Ha T 0.2 0.4 0.6 0.8 1. 12 Line of Rotation A) Volume Formula L = [(1 x) - (1-x)] dx B) 2x(x-x)dx (x-x4)dx x-axis x = 1 y-axis D) 2(1-x)(x-x)dx y = 1 Formula Method