Question

A metal rod heated from 30

oC to 80

oC. The final length of the rod is 115 cm.

The coefficient of linear expansion is 3.10

-3 oC

-1

. What is the initial length of the metal rod ?​

Answer 1

Answer:

100cm.

Explanation:

initial length is 100cm.

from the formula L2=L1(1+alpha into temp)

115=L1(1+3*10^-3*50)

L1=115/1.15

so,L1=100cm.

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