Two parallel walls, 8 m apart, are stayed together by a steel rod of 20 mm...

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Two parallel walls, 8 m apart, are stayed together by a steel rod of 20 mm diameter passing through metal plates and nuts at each end. The nuts are screwed upto the plates while the bar is at a temperature of 400 K. If the total yielding at the two ends is 5 mm, the pull exerted by the bar after it has cooled to 300 K is (Take asteel = 12 × 10%/K and Esteel = 2 x 10³ N/mm²) (a) 34.123 kN (b) 36.128 kN (c) 37.581 kN (d) 37.728 kN Two parallel walls, 8 m apart, are stayed together by a steel rod of 20 mm diameter passing through metal plates and nuts at each end. The nuts are screwed upto the plates while the bar is at a temperature of 400 K. If the total yielding at the two ends is 5 mm, the pull exerted by the bar after it has cooled to 300 K is (Take asteel = 12 × 10%/K and Esteel = 2 x 10³ N/mm²) (a) 34.123 kN (b) 36.128 kN (c) 37.581 kN (d) 37.728 kN

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