The simply supported beam is made of timber that has an allowable bending stress of \(\sigma_{\text {allow }}=960\) psi and an allowable shear stress of \(\tau_{\text {allow }}=75\) psi. Determine its dimensions if it is to be rectangular and have a height-to-width ratio of 1.25 .

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A 5 kip/ft -6 ft- 6 ft- B