A steel rod, 100 mm long is held between two rigid supports. It is heated by 20°C. If the coefficient of thermal expansion of the material of the rod is 15 x 10 /° C and modulus of elasticity is 200 x 10 MN/m, what is the stress in the rod ?

A steel rod, 100 mm long is held between two rigid supports. It is hea

1.	A steel rod, 100 mm long is held between two rigid supports. It is heated by 20°C. If the coefficient of thermal expansion of the material of the rod is 15 x 10 /° C and modulus of elasticity is 200 x 10 MN/m, what is the stress in the rod ?
A.	20 MN/m
B.	40 MN/m
C.	60 MN/m
D.	80 MN/m
Answer» D. 80 MN/m

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A steel rod, 100 mm long is held between two rigid supports. It is heated by 20°C. If the coefficient of thermal expansion of the material of the rod is 15 x 10 /° C and modulus of elasticity is 200 x 10 MN/m, what is the stress in the rod ?

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