Theory of Structures
Y are the bending moment, moment of inertia, radius of curvature, modulus of If M, I, R, E, F, and elasticity stress and the depth of the neutral axis at section, then

M/I = E/R = Y/F
I/M = R/E = F/Y
M/I = R/E = F/Y
M/I = E/R = F/Y

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Theory of Structures
The horizontal thrust on the ends of a two hinged semicircular arch of radius ‘R’ carrying

All of these
A uniformly distributed load ? per unit run over its entire span is 4/3 ?R/?
A uniformly distributed load ? per unit run over its right half span, is ? ?R/?
A distributed load varying from zero at the left end to ? per unit horizontal run at the right end, is ? ?R/?

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