The beam is constructed from three boards. The allowable shear stress that the wood can sustain is ${}_{\text{a}\text{l}\text{l}\text{o}\text{w}}=350.$ Each nail can resist a shear force of $300lb.($Figure $1)$

Figure

$1$ of $1$

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Part C

Determine the maximum allowable spacing $s$ of the nails used to hold the bottom flange to the web. Express your answer in inches to three significant figures.