The shear stresses in a rectangular beam are given by Eq. (5-39)

in which B is the shear force, I is the moment of inertia of the cross-sectional area, is the height of the beam, and y1 is the distance from the neutral axis to the point where the shear stress is being determined (Fig. 5-30).
By integrating over the cross-sectional area, show that the resultant of the shear stresses is equal to the shear force V.

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