4.Strain gauges a and b are attached to the surface of a gas tank. The strain gauge a is attached in the longitudinal direction (x axis) and b is arranged at an angle of 450 with x axis, as shown in Fig.1. The tank has an inner diameter of 1.5 m and wall thickness of 25 mm. It is made of steel having a modulus of elasticity E = 200 GPa and Poisson’s ratio ν = 1/3.

(1) When the tank is pressurized, the strain gauge a shows a reading of εa = 250×10–6. Determine the pressure p in the tank.

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