1. The problem statement, all variables and given/known data At a coal-burning power plant a steam turbine is operated with a power output of 491 MW. The thermal efficiency of the power plant is 39.0%. (a) At what rate is heat discarded to the environment by this power plant? ______ GW (b) At what rate must heat be supplied to the power plant by burning coal? ______ GW 2. Relevant equations e = W/Qh = Qh-Qc / Qh 3. The attempt at a solution I don't know how to approach this problem. Is there some equation for power to use for thermodynamics? Thanks!