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A bar of cross-section A is subjected to equal and opposite tensile forces at its ends. Consider a plane section of the bar whose normal makes an angle `theta` with the axis of the bar .
(i) What is the tensile stress on this plane?
(ii) What is the shearing stress on this plane?
(iii) For what value of `theta` is the tensile stress maximum
(iv) For what value of `theta` is the shearing stress maximum?

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