A steel bar 600mm long and having 30mm diameter, is turned down to 25mm diameter for one fourth of its length. It is heated at 30 C above room temperature, clamped at both ends and then allowed to cool to room temperature. If the distance between the clamps is unchanged, the maximum stress in the bar ( α = 12.5 x 10⁻⁶ per C and E = 200 GN/m²) is

A steel bar 600mm long and having 30mm diameter, is turned down to 25m

1.	A steel bar 600mm long and having 30mm diameter, is turned down to 25mm diameter for one fourth of its length. It is heated at 30 C above room temperature, clamped at both ends and then allowed to cool to room temperature. If the distance between the clamps is unchanged, the maximum stress in the bar ( α = 12.5 x 10⁻⁶ per C and E = 200 GN/m²) is
A.	25 MN/m²
B.	40 MN/m²
C.	50 MN/m²
D.	75 MN/m²
Answer» E.

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