The ratio of maximum shear stress to average shear stress for a circular beam cross-section subjected to shear force is:
A1.33 (4/3)
B1.50 (3/2)
C2.00
D1.15
Explanation
For a circular cross-section, tau_max = (4/3) * tau_avg = 1.33 * tau_avg. For a rectangular section, tau_max = 1.5 * tau_avg.

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