Suppose the ends of the rail are rigidly clamped at −5 ◦C to prevent expansion. Calculate the thermal stress in the rail if its temperature is raised to 35 ◦C. Young’s modulus for steel is 20 × 1010 N/m2 . Answer in units of N/m2 .

8.8×10^7 N/m^2

Explanation: Please find the attached file for the solution

because it says use -2,0,and 2 for x, we can plug those numbers into the equation. y/4=3/4(-2)+2   y/4= -1 1/2 +2 now to get x by itself, we can multiply each side by 4. y=-6+8 which equals y=2 when x=-2. now you can do the same thing with 0 and 2 as x. you get y=8 when x=0 and y=14 when x=2.

x   |   y

-2 |   2

0   |   8

2   |   14

small = small current large mag large current