Copper and silicon is cooled from 300 K to 60 K, the specific resistance

Copper and silicon is cooled from 300K to 60K, the specific resistance.

A semi-conductor is cooled from T_1K to T_2K . Its resistance

A semiconductor is cooled form T_(1)K to T_(2)K . Its resistance

Five kg of air is heated at constant volume. The temperature of air increase from 300K to 340K. If the specific heat at constant volume is 0.169 kcal/kg K, find the amount of heat absorbed.