Under what situation shall engineers use jacking at one end

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1.Neglecting air resistance, determine the height a vertical jet of water will rise if projected with velocity 58 ft/ s.

2.Sometimes the side of concrete bridges is observed to turn black in colour. What is the reason for this phenomenon? In prestressing work, if more than one wire or strand is included in the same duct, why should all wires/strands be stressed at the same time?

3.Under what situation shall engineers use jacking at one end only and from both ends in prestressing work?

4.A 4m long steel solid circular rod must not stretch more than 3 mm and the normal stress must not exceed 150 MPa when the rod carries a load of 10 kN. Knowing that for steel E= 200 GPa and v (Poisson's ratio) = 0.25, determine the required diameter of the rod.

Reference no: EM13543384

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