The bronze bar 3 m long with a cross-sectional area of 350 mm? is placed between two rigid walls. At a temperature of -20°C, there is a gap A = 2.2 mm, as shown in the figure. Find the temperature at which the compressive stress in the bar will be 30 MPa. Use a = 18.0 x 10-6 / °C and E = 80 GPa. 3 m Hale

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