5.43 a refrigeration cycle operating between two reservoirs receives energy qc from a cold reservoir at tc 5 275 k and rejects energy qh to a hot reservoir at th 5 315 k. for each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible: (a) qc 5 1000 kj, wcycle 5 80 kj. (b) qc 5 1200 kj, qh 5 2000 kj. (c) qh 5 1575 kj, wcycle 5 200 kj. (d) ␤ 5 6.