Question

A rod bar of length 2m rest on smooth horizontal floor. If the rod is heated from 0 clelsius to 20 clesius . Find the longitudinal strain developed?

Answer 1

Hey dear,
You have given incomplete data.

● Answer- 20α

● Explanation-
# Given-
l = 2m
T1 = 0 °C
T2 = 20 °C

# Solution-
Suppose, length of rod changes from L to L' during heating.
∆L = L' - L

Longitudinal strain is related to heating as-
ΔL/L = αΔT
where, α = coefficient of thermal expansion
∆T = T2-T1 = 20-0 = 20 °C

Hence, Strain = 20α

Coefficient of thermal expansion depends on material of the rod.
You just put value if alpha you'll get strain.

Hope this is helpful...

Answer 2

Longitudinal strain produced only and only if there is an oppossition in increament or decrement hence in this rod is on smooth horizontal surface so no opposition strain will be ZERO.