a tie bar 300 mm long has enlarged ends of square section 60mm × 60mm. if the middle portion of the bar is also of square cross section, find the size and length of the middle portion,if the stress there is 140MN/m^2.The bar is subjected to an axial pull of 87.5KN and the total extension of the bar is 0.14mm. Take E=200GN/m^2
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answer is 200000000000000000000000000000
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