When the temperature is at 30°C, the A-36 steel pipe fits snugly between the two fuel tanks. When fuel flows through the pipe, it causes the temperature to vary along the pipe as T = (5/3 x²- 20x + 120)°C, where x is in meters. Determine the normal stress developed in the pipe. Assume each tank provides a rigid support at A and B.

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150 mm 10 mm- Section a - a -6 m- B' PA