A sample of a 20 mm reinforcing steel used in concrete structure is subjected to a tensile test. The gauge length of the test specimen is 150 mm. From the stress-strain curve, it was identified that the yield stress of the steel was 550 MPa. Determine the corresponding yield strain.Take Young's modulus as 200,000 MPa.The steel bar fractured at 210 kN. Find out the ultimate tensile strength of the steel.

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