Rigid bar ABCD is initially horizontal before the load W is applied and a change of temperature is affected. Bronze 3 т Steel 1.5 m В 1 m D 2.5 m 1.5 m 80 kN Material А (тт)? a (/°C) E (GPa) Steel Rod...

Pls help answer the required THANKS

Extracted text: Rigid bar ABCD is initially horizontal before the load W is applied and a change of temperature is affected. Bronze 3 т Steel 1.5 m В 1 m D 2.5 m 1.5 m 80 kN Material А (тт)? a (/°C) E (GPa) Steel Rod 320 11.7 x 10-6 200 Bronze Rod 1300 18.9 x 10-6 83 Required: Temperature change AT that will cause a tensile stress of 55 MPa in the steel rod.