please help step by step phym316 mc 139%. question 4 (25 marks) Consider a metal bar with square cross-section that is 10 cm long and 1 cm wide. A potential difference of 250 V is applied across its ends. It has a resistivity of 10-8 2m and electron density of 6 x 10sm-3 (a) Calculate the relaxation time, T. (b) Calculate the shift in the Fermi surface due to the applied voltage. [51 15] (d) What is the thermal conductivity...
Design Problem Design a small chiller room 2.35 m wide by 6 m long and 2.38 m high that is to be used to chill and store a food product. The chiller is to be loaded with 60 buckets of the food product at 23 °C which needs to be cooled down to 3 °C within 24 hours using air at 1 °C, with a heat transfer coefficient of 36 W m2 K Tasks 1. Calculate the peak refrigeration loading...