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I dont understand how to derive equations.

#1

C = YI / r

Y = Young's modulus of the material

r = radius of curvature of the neutral surface

I = geometrical moment of inertia of the cross section of the beam

C = bending moment

#2

I = wt^3 / 12

I = moment of inertia

w = width of rectangular beam

t = thickness of rectangular beam

#3

Koenig's Apparatus

theta = h / 2(d+2D)

theta =angle of deflection

d = distance between mirrors on rectangular beam

D = distance between mirror(mirror which is closer to telescope) to scale

h = difference between the reading of scale

Thank you :D

i'm not good wif deriving equations :(

oh, and one more

have a question asking me to arrange three beams in the order of their radius of curvature when Y, C and A are equal, the three beams are Round beam, Square beam, H-shaped beam.

i just need to find equations for moment of inertia for these shapes?

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# Young's modulus of the material

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