First slide
Stress and strain
Question

One end of a uniform wire of length L and weight ω is attached rigidly to a point in roof and a weight ω1
is suspended from its lower end. If S is the area of cross-section of the wire, the stress in the wire at a height of  3L4  from its lower end is

Moderate
Solution

At length  3L4 from lower end, tension in the wire,

T = suspended load + 34× weight of wire = ω1+3ω4

  Stress =TS=ω1+3ω4S

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