A car engine whose output power is 145 hp operates at about 16 % efficiency. Assume...
A car engine whose output power is 145 hp operates at about 16 % efficiency. Assume the engine's water temperature of 79 ∘C is its cold-temperature (exhaust) reservoir and 495 ∘C is its thermal "intake" temperature (the temperature of the exploding gas-air mixture).
What is the ratio of its efficiency relative to its maximum possible (Carnot) efficiency?
Estimate how much power (in watts) goes into moving the car.
How much heat, in joules and in kcal, is exhausted to the air in 1.0 h.
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A car engine whose output power is 145 hp operates at about 16 %
efficiency. Assume...
A car engine whose output power is 205 hp h p operates at about 18 %...
A car engine whose output power is 205 hp h p operates at about 18 % % efficiency. Assume the engine's water temperature of 94 ∘C ∘ C is its cold-temperature (exhaust) reservoir and 495 ∘C ∘ C is its thermal "intake" temperature (the temperature of the exploding gas-air mixture). How much heat, in joules and in kcal, is exhausted to the air in 1.0 hh.
A Carnot engine whose hot-reservoir temperature is 400 ∘C has a thermal efficiency of 45 %...
A Carnot engine whose hot-reservoir temperature is 400 ∘C has a thermal efficiency of 45 % . By how many degrees should the temperature of the cold reservoir be decreased to raise the engine's efficiency to 58 % ?
A Carnot engine operates with an efficiency of 29% when the temperature of its cold reservoir...
A Carnot engine operates with an efficiency of 29% when the temperature of its cold reservoir is 295 K. Assuming that the temperature of the hot reservoir remains the same, what must be the temperature of the cold reservoir in order to increase the efficiency to 33%?
A gasoline engine has a power output of 170 kW (about 2.28×105 hp ). Its thermal...
A gasoline engine has a power output of 170 kW (about 2.28×105 hp ). Its thermal efficiency is 22.0 %. 1- How much heat must be supplied to the engine per second? Express your answer in joules per second. 2-How much heat is discarded by the engine per second? Express your answer in joules per second.
3. A newly built engine operates between the room temperature (21 oC) and the melting point...
3. A newly built engine operates between the room temperature (21 oC) and the melting point of silver (961 oC) and claims to have an actual efficiency of 75.0 %. a) How much mechanical energy per cycle does the engine deliver if it absorbs 3.50 x 106 J of heat everycycle (from the hot bath) assuming this claim is true? b) How much thermal energy does the engine reject per cycle to the colder reservoir at 21o C if the...
62. A Carnot engine operates between the temperatures Th = 1.00 x 102° C and Te...
62. A Carnot engine operates between the temperatures Th = 1.00 x 102° C and Te 20.0° C. By what factor does the theoretical efficiency increase if the temperature of the hot reservoir is increased to 5.50 x 102 C? A Carnot engine operates betwe en 100° C and 20°C. How much ice can the engine melt 64. V from its exhaust after it has done 5.0 x 104 J of work?
A friend passionate about cars mentions that Toyota has developed an engine with a thermal efficiency...
A friend passionate about cars mentions that Toyota has developed an engine with a thermal efficiency of 40% which is an extraordinary accomplishment! 1) Supposing this engine is ideal and based on the Carnot cycle, and also assuming that the cold reservoir temperature is 300 K, what is the hot reservoir temperature to meet the stated efficiency? You mention your result to this friend who points out correctly that the temperature of the hot reservoir would essentially be the temperature...
A nuclear power plant operates at 65 percent of its maximum theoretical (Carnot) efficiency between temperatures...
A nuclear power plant operates at 65 percent of its maximum theoretical (Carnot) efficiency between temperatures of 560oC and 350°C. If the plant produces electric energy at the rate of 1.20 Giga-Watts, how much exhaust heat is discharged per hour?
4. A4.6 L spark ignition engine operates on the ideal Otto cycle with a compression ratio of 10. At the beginning of the compression process the air is at 107 kPa and 21 C. The maximum cycle temp...
4. A4.6 L spark ignition engine operates on the ideal Otto cycle with a compression ratio of 10. At the beginning of the compression process the air is at 107 kPa and 21 C. The maximum cycle temperature is 1116°C. Accounting for variable specific heats, determine: (a) the heat addition per cycle in kJ. Ans: 3.368 kJ (b) the net work per cycle in kJ. Ans: 1.907 kJ (c) the mean effective pressure in kPa. Ans: 460.6 kPa (d) the...
A Carnot engine operates us ing 1.0 mol e of monoatomic ideal gas as a working...
A Carnot engine operates us ing 1.0 mol e of monoatomic ideal gas as a working s ubstance. In t he first step, the gas is place d in thermal contact with a heat reservoir and expands isothermally to 3 .0 times its initial volume. (a) If the internal energy o f the gas after this step is 6.25 k J , calculate the temperature of the heat reservoir ( T h ) . (b) C alculate the heat absorbed...
62. A Carnot engine operates between the temperatures Th = 1.00 x 102° C and Te 20.0° C. By what factor does the theoretical efficiency increase if the temperature of the hot reservoir is increased to 5.50 x 102 C? A Carnot engine operates betwe en 100° C and 20°C. How much ice can the engine melt 64. V from its exhaust after it has done 5.0 x 104 J of work?
4. A4.6 L spark ignition engine operates on the ideal Otto cycle with a compression ratio of 10. At the beginning of the compression process the air is at 107 kPa and 21 C. The maximum cycle temperature is 1116°C. Accounting for variable specific heats, determine: (a) the heat addition per cycle in kJ. Ans: 3.368 kJ (b) the net work per cycle in kJ. Ans: 1.907 kJ (c) the mean effective pressure in kPa. Ans: 460.6 kPa (d) the...
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