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[tex]\tau[/tex] = (V*Q)/(I*t)

Q=first moment of area, t=width, I= Ixx and V=shear force

3. First I found the greatest shear for to be 10Kn at point b

Then I found second moment of inertia = 1360000

Now I need to calculate for Q (first moment of area) = A*y

I need to do this for the section above the point c first (centroid)

But I'm having difficulty knowing what the value of 'y' should be in this calculation i.e the coordinates of the centroid, how to I do this?

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# Homework Help: Greatest shearing stress in T-Beam

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