A rod having α = 1*10-5per °C and length of 70cm has one of its end rigidly connected to another rod of length 1m and α= 0.5*10-5per °C. Find the new length of the two joined rods when their temperature is increased by 30℃.

A rod having α = 1*10-5per °C and length of 70cm has one of its end

1.	A rod having α = 110-5per °C and length of 70cm has one of its end rigidly connected to another rod of length 1m and α= 0.510-5per °C. Find the new length of the two joined rods when their temperature is increased by 30℃.
A.	170.021cm
B.	169.021cm
C.	171.031cm
D.	170.031cm
Answer» B.