Arefrigeration cycle operating between two reservoirs receives energy qc from a cold reservoir at tc = 275 k and rejects energy qh to a hot reservoir at th = 315 k. for each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible: (a) qc = 100 kj, wcycle = 80 kj. (b) qc = 1200 kj, qh = 2000 kj. (c) qh = 1575 kj, wcycle = 100 kj. (d) β = 8.

The second largest public utility in the nation is the sole provider of electricity in 32 counties of southern florida. to meet the monthly demand for electricity in these counties, which is given by the inverse demand function p = 1,200 – 4q, the utility company has set up two electric generating facilities: q1 kilowatts are produced at facility 1, and q2 kilowatts are produced at facility 2 (so q = q1 + q2). the costs of producing electricity at each facility are given by c1(q1) = 8,000 + 6q12 and c2(q2) = 6,000 + 3q22, respectively. determine the profit-maximizing amounts of electricity to produce at the two facilities, the optimal price, and the utility company’s profit