51. IE •• A Carnot engine takes in heat from a reservoir at 350 °C and has an efficiency of 35%. The exhaust temperature has not changed, and the efficiency is increased to 40%.

(a) The temperature of the hot reservoir is (1) lower than, (2) equal to, (3) higher than 350 °C. Explain.

(b) What is the new Celsius temperature of the hot reservoir?