Question

A rod of length 2m rests on smooth horizontal floor if the rod is heated

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...