A 600 mm long and 50 mm diameter rod of steel ( = 200 GPa, α = 12 x 10/°C) is attached at the ends to unyielding supports. When the temperature is 30°C there is no stress in the rod. After the temperature of the rod drops to - 20°C, the axial stress in the rod will be

A 600 mm long and 50 mm diameter rod of steel ( = 200 GPa, α = 12 x 1

1.	A 600 mm long and 50 mm diameter rod of steel ( = 200 GPa, α = 12 x 10/°C) is attached at the ends to unyielding supports. When the temperature is 30°C there is no stress in the rod. After the temperature of the rod drops to - 20°C, the axial stress in the rod will be
A.	24 MPa (compressive)
B.	72 MPa (compressive)
C.	120 MPa (tensile)
D.	144 MPa (compressive)
Answer» D. 144 MPa (compressive)

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A 600 mm long and 50 mm diameter rod of steel ( = 200 GPa, α = 12 x 10/°C) is attached at the ends to unyielding supports. When the temperature is 30°C there is no stress in the rod. After the temperature of the rod drops to - 20°C, the axial stress in the rod will be

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