A flat bar is . thick and has a centrally located drilled hole of diameter D. The bar is s...

A flat bar is . thick and has a centrally located drilled hole of diameter D. The bar is subjected to a 4000-lb tensile load. Compute the maximum tensile stress adjacent to the hole

(a) if the bar is 2 in. wide and D = 0.25 in.

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(b) if the bar is 2.5 in. wide and D = 0.50 in.

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(c) if the bar is 3 in. wide and D = 1.00 in.