Question

problem 2 please!

exceed the work required to run the refrigerator. This: supplied to the house can is impossible by first law b) is impossible by second law c) would only work if the ground and the house were at the same temperature d) is impossible since heat flows from the (hot) house to the (cold) ground e) is possible Problem 2 (3 points) A heat engine absorbs 100.0 kJ of heat from a hot reservoir at 100.0 °C and rejects 40,0 kJ of heat to a cold reservoir at 20.0 °C. Is this engine possible? Justify your answer. Problem 3 (5 points) A 15.0 g ice cube is initially at -15.0°C. It absorbs enough heat to turn into water at 5.0° C. What is the change in entropy of the ice cube?

Answer 1

9 T, - 373K - 100°C T2 = 293K - 2006 2) Given: Qu = 100 kJ Q2- = 40 kJ Efficiency of heat engine is given by. 1-2 1-40 100 % - 0.6 nn -60% Now efficency of carnot engine is given by me 1-22 1 - I Ti 1 ma 293 373 ņ= 0.214 né 21.4% mn > nc Here but Carnot engine have higher efficiency any thom Hence Innpne any engine. Son This engine is not possible