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A Carnot engine has an efficiency of 0.475, and the temperature of its cold reservoir is 383 K. (a) Determine the temperature of its hot reservoir. (b) If 6390 J of heat is rejected to the cold reservoir, what amount of heat is put into the engine?
(a) number units
(b) number units
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- 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?arrow_forwardWhat is the Carnot efficiency (in percent) of a heat engine operating between the temperatures of 395°C (668 K) and 170°C (443 K)?arrow_forwardSuppose a heat engine is connected to two energy reservoirs, one a pool of molten aluminum (660°C) and the other a block of solid mercury (-38.9°C). The engine runs by freezing 1.40 g of aluminum and melting 16.0 g of mercury during each cycle. The heat of fusion of aluminum is 3.97 x 105 J/kg; the heat of fusion of mercury is 1.18 x 104 J/kg. What is the efficiency of this engine? 74.9 4 X Note that the usable energy in a heat engine is the difference between the energy input and the exhaust energy. % Need Help? Watch It Additional Materials eBookarrow_forward
- A heat engine takes 1800 kcal of heat from a hot reservoir at 270oC and vents 1200 kcal to a cold reservoir at 40oC. What is the efficiency of this heat engine and what is the maximum efficiency that any heat engine between these two reservoirs could have?arrow_forwardWhat is the theoretical maximum efficiency of a heat engine (Carnot engine) operating between 150.0 C and 400.0 C? O 0.3714 O 0.6250 O 0.3750 O 0.2500 O 0.3560arrow_forwardA heat engine operates between a hot reservoir at 500°C and a cold reservoir at 25°C. It has an efficiency of 40%. Calculate the amount of heat absorbed from the hot reservoir when the engine expels 1500 J of heat to the cold reservoir.arrow_forward
- A certain heat engine does 9.5 kJ of work and 8.00 kJ heat transfer occurs to the environment in a cyclical process. (a) What was the heat transfer (in kJ) into this engine? kJ (b) What was the engine's efficiency (in percent)? %arrow_forwardA heat engine uses a heat source at 530 ∘C and has an ideal (Carnot) efficiency of 28 % . To increase the ideal efficiency to 43 % , what must be the temperature of the heat source?arrow_forwardWith 2.56×106 J of heat transfer into this engine, a given cyclical heat engine can do only 1.50×105 J of work.(a) What is the engine’s efficiency? (b) How much heat transfer to the environment takes place?arrow_forward
- What is the Carnot efficiency (in percent) of a heat engine operating between the temperatures of 360°C (633 K) and 200°C (473 K)?arrow_forwardProblem 2: This problem compares the energy output and heat transfer to the environment by two different types of nuclear power stations—one with the normal efficiency of 36 %, and another with an improved efficiency of 47 %. Suppose both have the same heat transfer into the engine in one day, 2.5 × 1014 J Part (a) How much more electrical energy is produced by the more efficient power station? Part (b) What is the change in the heat transfer to the environment after the upgrade to the more efficient power station?arrow_forwardA heat engine operates between a reservoir at 27°C and one at 374°C. What is the maximum efficiency possible for this engine?arrow_forward
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