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Required information

Problem $06\mathrm{.}002-$Horizontal shearing stress in a beam $-$ DEPENDENT MULTI$-$PART PROBLEM $-$ ASSIGN ALL PARTS

A square box beam is made of two $\frac{3}{4}3\mathrm{.}5-$in$.$ planks and two $\frac{3}{4}5-$in$.$ planks nailed together as shown. Know that the spacing between the nails is $s=2in.$ and that the allowable shearing force in each nail is $75$ lb $.$

NOTE: This is a multi$-$part question. Once an answer is submitted, you will be unable to return to this part.

Problem $06\mathrm{.}002.$b $-$ Horizontal shearing stress in a beam

Determine the corresponding maximum shearing stress in the beam.

The maximum shearing stress in the beam is $$ psi.