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21 Arod of length 2m is at temperature of 20 C The temperature is increased...

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21 Arod of length 2m is at temperature of 20 C The temperature is increased to 50 C If permitted expansion without thermal stress is 0 4mm the thermal stress produced is Y 2 10 Pa a 15 10 C 1 5 x 107 N m 2 4 107 N m 3 3 x 107 N m 4 2 107 N m

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