The fence board weaves between the three smooth fixed posts $($ Figure $1).$ The posts remain along the same line. The board has a width of $6$ in$.$ and a thickness of $0\mathrm{.}6in.$ Assume the displacement of each end of the board relative to its center is $3in.$ Take $E=1\mathrm{.}60({10}^3)ksi.$

Part A

Determine the maximum bending stress in the board.

Express your answer in kilopounds per square inch to three significant figures.

${}_{\text{m}\text{a}\text{x}}=$

ksi

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