A square box beam is made of two 20 × 80-mm planks and two 20 × 120-mm planks nailed together as shown. Knowing that the spacing between the nails is s = 30 mm and that the vertical shear in the beam is V = 1200 N, determine (a) the shearing force in each nail, (b) the maximum shearing stress in the beam.
Fig. P13.50

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