1. The problem statement, all variables and given/known data A Carnot heat engine operates between temperatures Th and Tc. (a) If Th = 515 K and Tc = 363 K, what is the efficiency of the engine? 0.30 Your answer is correct. (b) What is the change in its efficiency for each degree of increase in Th above 515 K? ? K-1 (c) What is the change in its efficiency for each degree of change in Tc? ? K-1 (d) Does the answer to part (c) depend on Tc? Yes or No? Explain. 2. Relevant equations e_c = 1 - T_c/T_h 3. The attempt at a solution (a) T_h = 515k T_c = 363k e_c = 1 - T_c/T_h = 1 -363k/515k = 0.2951456311 = 0.30 I'm don't know how to start part (b). Do I use the same equation or a different one?