please help in solving this static problem 2 4 A surveyors c

please help in solving this static problem 2

4. A surveyors chain, 100-ft standard length, is 0.24 inches longer because of an increase in temperature. Determine the average thermal strain for this chain.

Solution

Average thermal strain = change in length/original length

= 0.24 in/100 ft = 0.24/(100*12) = 2*10^-4 in/in