Your car’s engine is a heat engine; it converts the thermal energy from burning fuel into energy to move your car and power its systems. On a cold winter day, you needn’t feel guilty about cranking up the heat in your car; running the heater doesn’t cost any additional energy beyond the small amount needed to run the fan. Explain why this is so.

Q: A 4-ton air conditioner removes 5.06×107 J (48,000 British thermal units) from a cold environment in…

A: (a) Write the formula for the EER. Thus,

Q: What is the maximum possible efficiency of a heat engine that has a hot reservoir of water boiling…

A: Given : Th = 125°C = 125 + 273 = 398 K Tc = 25°C = 25 + 273 = 298 K

Q: A 1.000 ´ 103 kg car is moving at 90.0 km/h (25.0 m/s) as it exits a freeway. The driver brakes to…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: A certain amount of heat is transferred to a system, and the system performs some work on its…

A:

Q: If 10 kJ of thermal energy is added to the system and 10 kJ of work is done by the system, what…

A: The thermal equilibrium depends upon the temperature of the bodies ket in contact with each other.…

Q: What are the efficiencies of reversible heat engines operating between (a) the normal freezing and…

A: Given Data: (a) The freezing point of water is: TL=0°C=273 K The boiling point of water is:…

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Q: When a hybrid car brakes to a stop, much of its kinetic energy is transformed to A. Heat B. Work C.…

A: The correct option is (C) Explanation- whenever car stops the car use friction brakes which inhibit…

Q: The second principle of thermodynamics implies that (a) thermal energy cannot be entirely converted…

A: Correct option is A second law of thermodynamics states that , "It is impossible to construct a…

Q: A heat pump is a heating system that has an efficiency of about 150 %, that is, for every joule (J)…

A: Let us first look at the statement of Second Law of Thermodynamics, the Kelvin-Planck Statement:…

Q: Consider a room that is initially at the outdoor temperature of 20 C. The room contains a 60-W light…

A:

Q: 5.120 A driver’s manual states that the stopping distancequadruples as the speed doubles; that is,…

A:

Q: A lump of plasticine weighing 200 g is thrown at an angle of 30° and at a speed of 16 m/s towards…

A:

Q: 42) During each cycle of operation, a refrigerator absorbs 230 J of heat from the freezer and expels…

A: Given, Heat absorbed = 230 J Heat expelled = 356 J Work input in each cycle is given by = Heat…

Q: 2 of surface area 34°C, ε=0.9 skin and is outside exercising on a h=10 W/m2K, 15°C day. The student…

A: Given:- Area A = 1.5 m2  Surface Temperature T1 = 340 C  Emissivity e = 0.9  h = 10 W/m2K  The…

Q: In a tennis game, a player has taken 1.00 kg of water that has been evaporated through perspiration…

A: Internal energy change of the player = - 3410000 Joules  Using 1 nutritional calorie = 4186 Joules

Q: A block (4 kg) starts from rest and slides down a frictionless ramp #1 of height 9 m. The block then…

A: Since you have posted multiple parts we will solve the first three parts for you, kindly post the…

Q: Q.4) Suppose 100 J of work is done on a system and 60.0 calis extracted from the system as heat in…

A: Given : 100 J of work is done on a system and 60.0 cal is extracted from the system as heat

Q: You are boiling water in a pot on the stove for your tea. Being the brilliant scientist you are, you…

A: Given. The 0.1 kg of water in a pot is boiling at 100 degrees celsius. In the process of boiling the…

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A: It has been observed that the temperature below the ground is more stable than the temperature above…

Q: Compared to a giant iceberg, a hot cup of coffee has more what?   (A) Thermal energy and higher…

A: It is a concept of Thermodynamics

Q: A 1,500 kg car traveling at 13.4 m/s (30 mph) applies its breaks and comes to rest in 5.5 seconds.…

A:

Q: A driver’s manual states that the stopping distance quadruples as the speed doubles; that is, if it…

A: To Prove:  The above given statement  using first law of thermodynamics and mechanics.

Q: model steam engine of 1.00 kg mass pulls eight cars of 1.00 kg mass each. The cars start at rest and…

A: First law of thermodynamics assigns that the change in internal energy of a system is equal to the…

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Q: Suppose that 1200 J of heat is used as input for an engine under two different conditions. In part…

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Q: Imagine that a hypothetical life form is discovered on our moon and transported to Eirth. On a hot…

A: Extra terrestrial :Heat lost = Mass * latent heat of vapourisation  = 339 cal/gm * 259 gm = 87801…

Q: Which of the following can effectively lower the internal energy of a room? A A fan B A refrigerator…

A:

Q: In moving out of a dormitory at the end of the semester, a student does 2.12x 104 J of work. In the…

A: according to 2md law of thermodynamics  Q = W + U      Q = heat given to the system W = work done b…

Q: Q4 A suggestion for renewable energy generation is to use the temperature differences in the ocean…

A: The temp. difference b/w the warm surface and cold surface help to harness the Ocean Energy. Tropics…

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Q: The Bodø NATO base in northern Norway uses a heat pump to extract heat from ocean water. 7.0°C ocean…

A: Given Data: The final temperature of the ocean water is, T2=7°C The initial temperature of the ocean…

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Q: Let 1.00 kg of liquid water at 100°C be converted to steam at a pressure of 1.01 * 105 Pa. The…

A: Given data: 1kg of water  Initial temperature of water = 100°c Final temperature of steam = 100°c…

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A: The temperature are given in Fahrenheit. Convert these temperatures into Kelvin.

Q: How much work is needed to lift a bag of groceries that weighs 250N to a height of 4m?   A. 1000…

A: Given : w = 250 N h = 4 m

Q: While walking you give off 4.0x10^5J of heat and your internal energy decreased by 6.0x10^5 J. How…

A: Given information: Here, ΔQ is the heat released by the person’s body while walking, and ΔU is the…

Q: 15.3.1. An insulated container is filled with a mixture of water and ice at zero °C. An electric…

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Q: The surface waters of tropical oceans are at a temperature of 27°C while water at a depth of 1200 m…

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Q: Calculate q when 29 J of work is done on a system and its internal energy increases by 96 J

A: work done on the system=  29 J Increase in internal energy = 96 J

Q: A block (4 kg) starts from rest and slides down a frictionless ramp #1 of height 7 m. The block then…

A:

First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.