Two parallel walls are 8m apart, stayed together by a steel rod , 20mm diameter passing through metal plates and nuts at both ends. The nuts are screwed up to the plates while the bar is at a temperature of 400 K. Find the pull exerted by the bar after it has cooled to 300 K . Find the pull exerted by the bar if
(i) the ends do not yield
(ii) the ends yield by 5mm
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