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A lintel of prestressed reinforced concrete is around 1.45 m long. The cross-sectional area of the concrete is 60.0 cm2. The concrete encloses one steel reinforcing rod having cross-sectional area of 1.50 cm2. The rod joins the two strong end plates. Young's modulus for the concrete is around 3.00 x 1010 N/m2. After the concrete cures and the original tension T1 in the rod is released, the concrete is to be beneath compressive stress 8.20 x 106 N/m2

(i) By what distance will the rod compress the concrete if the original tension in the rod is free?

(ii) Beneath what tension T2 will the rod still be?

(iii) Determine how much longer than its unstressed length will the rod then be?

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