Heat is transferred to a heat engine (runs on a thermodynamic cycle) from a furnace at a rate of 80 mw. if the rate of waste heat rejection to a nearby river is 50 mw, (a) identify the thermal reservoirs, (b) determine the net power output, and (c) the thermal efficiency for this heat engine.

Water flows through a garden hose which is attached to a nozzle. the water flows through hose with a speed of 2.19 m/s and through the nozzle with a speed of 19.8 m/s. calculate the maximum height (in m) to which water could be squirted if it emerges from the nozzle and emerges with the nozzle removed.