A. True or False: The great thing about the thermal expansion coefficient \'alph

Question

A. True or False: The great thing about the thermal expansion coefficient 'alpha' is that it is the same for all materials so that it does not matter what material you use in a structure, the thermal expansion of the structure will be the same?

B-Give an example of a situation where thermal expansion must be accounted for?

C-Think of powerlines next to a road. If these lines were installed in the summer and were stretched tight at that time, what might be the situation with these same lines on a very cold winter's day?

Explanation / Answer

A)
FALSE

thermal expansion coefficient 'alpha' is not same for all materials

coefficient of linear expansion'alpha' depends upon the nature of material and scale of

temparature only.

and it is independent of initial length,initial temparature,scale of length

B)

1)

in the construction of railtrack,a gap is to be left between successive rails to allow forexpansion

during summer

2)

invar steel is an alloy with very low alpa,so it is used in making pendulum clocks,balance wheels and measuring tapes or scales

3)

hot chimney cracks when a drop of water falls on it because of the unequal expansion

C)

in summer if power lines were installed and stretched tightly,on a very cold winter's these same

lines will be get contraction they may break,

hence power lines or telephone wires should be connected between the poles by giving enough

sag to allow the contraction during winter.

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