For the circular cross section shown having a radius r = 0.4 m. if it is subjected to a 30 kN shear force. the shear stress at point A is . kPa NA O a. 79.618 O b. 44.785 Oc. 238.854 O d. 59.713
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A: Lagrangian L=T-VT=12m(x2.+y2.)V=mgy
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