A laterally insulated fin 25 m long is initially at 60c the

Question

A laterally insulated fin 2.5 m long is initially at 60?C. The temperature of one end is suddenly increased to and maintained at 600?C while the temperature of the other end is maintained at 60?C. The diffusivity is a = 10^-5m²/s. Use five x steps, time increments of 5 ks, and calculate the time necessary for the center of the rod to reach a temperature of

1. 90?C

4. 110?C

5. 120?C

6. 140?C

7. 160?C