A diesel engine has efficiency 0.180. (a) In order for this engine to do 1.24 * 10^4 J of work, how many joules of heat must it take in? (b) How many joules of this heat is discarded?

A heat engine is being designed to have a Carnot efficiency of 60% when operating between two heat reservoirs. (a) If the temperature of the cold reservoir is 20°C, what must be the temperature of the hot reservoir? °C (b) Can the actual efficiency of the engine be equal to 60%? O Yes O No Explain your answer.

In each cycle of its operation, a heat engine expels 2 400 J of energy and performs 1 800 J of mechanical work. (a) How much thermal energy must be added to the engine in each cycle? (b) Find the thermal efficiency of the engine.

A heat engine produces 2000 J of work while operating between 210 degrees Celsius and 35 degrees Celsius. How much heat (in J) is withdrawn from the hot source to produce this much of work? (Format of final answer should be 1.00x10^2) and Calculate the efficiency of the engine (in percent).

a Carnot refrigerator requires a work input of only 230 J to extract 346 J of heat from the cold reservoir. Doesn’t this discrepancy imply a violation of the law of conservation of energy? Explain why or why not.

4500J of heat was absorbed from a Carnot engine from a reservoir at 650K. The engine did some work, and discards some heat to a sink at 350K. Evaluate: (i) The heat that is discarded. (ii) The work the engine did. (iii) The efficiency of the system.