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Strength of Materials - Engineering

Q1:

The bending stress in a beam is __________ section modulus.

A directly proportional to

B inversely proportional to

ANS:B - inversely proportional to

Section modulus Z = I/Y -----------equation (1).

Bending Equation = M/I = F/Y = E/R.

M/I = F/Y.

M/F = I/Y.

Than from equation (1).

Z = M/F.

Which show the section modulus is inversely proportional to Bending stress.