Grocery store managers contend that there is less total energy consumption in the summer if the store is kept at a low temperature. Make arguments to support or refute this claim, taking into account that there are numerous refrigerators and freezers in the store.

Q: By how much must one lower the temperature of a 65 – g of aluminum to change its internal energy by…

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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: You are boiling water in a pot on the stove for your herbal tea. There is 0.15kg of water in the pot…

A: Mass of water (M) = 0.15kg Initial state : Liquid at 100°C temperature Final state :  Solid at…

Q: Is it possible to determine whether a change in internal energy is caused by heat transferred, by…

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Q: A 68 kg cyclist is pedaling down the road at 15 km/h, using a total metabolic power of 480 W. A…

A: The cyclist spends only about 25% of the total metabolic power (P) generated in his body to propel…

Q: Which of the following depends only on the initial and final state of the system? O work change in…

A: Quantities which only depend on initial and final position of the process irrespective of the path…

Q: In each of the following situations, find the change in internal energy of the system. (a) A system…

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Q: For objects at thermal equilibrium, which of the following is true? Explain. (a) Heat will not…

A: When two objects of different temperatures are in contact with each other then they exchange their…

Q: What will happen to the temperature of a kitchen if the refrigerator door is left wide open for a…

A: Introduction : How a normal refrigerator works (when the door is closed) :Refrigerator work as heat…

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

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Q: On a typical day, a 65-kg man sleeps for 8.0 h, does light chores for 3.0 h, walks slowly for 1.0 h,…

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Q: Strictly speaking, why will a refrigerator containing a fixed amount of food consume more energy in…

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Q: A 73-kg cross-country skier glides over snow as in the figure below. The coefficient of friction…

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Q: A 68 kg cyclist is pedaling down the road at 15 km/h, using a total metabolic power of 480 W. A…

A: The total chemical energy (C.E) (metabolic power) can be converted into thermal energy (Th.E) and…

Q: How do heat transfer and internal energy differ? In particular, which can be stored as such in a…

A: The most basic difference between heat transfer Q and internal energy U: It can be easily understood…

Q: A 68 kg cyclist is pedaling down the road at 15 km/h, using a total metabolic power of 480 W. A…

A: Given: The mass of the cyclist is m=68 kg. The speed of the cyclist is v=15 km/h. By applying…

Q: 2.50 g of ammonia boils at atmospheric pressure (1.10x10^5 N/m^2) and -33.0 degree C, changing its…

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Q: Give limitation of first law of thermodynamics ?

A: The limitations of first law of thermodynamics is given below.The first law of thermodynamics do not…

Q: The tea in a cup of tea has a temperature of 50 degree celsius and a certain internal energy. If all…

A: mass = p*v ∆Q = ms∆T         =ρVS∆T                                        S =   specific heat…

Q: The ground temperature a few meters below the surface is fairly constant throughout the year and is…

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

Q: An old tale says: On a hot summer day you can cool the kitchen by leaving the refrigerator door…

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Q: The COP of a refrigerator decreases as the temperature of the refrigerated space is decreased. That…

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Q: What condition is necessary for a process to be adiabatic?

A: An adiabatic process is an expansion or compression, where no heat enters or leaves a system.

Q: What is the change in internal energy of a car if you put 12.0 gal of gasoline into its tank? The…

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Q: A steam-driven turbine is one major component of an electric power plant. Why is it advantageous to…

A: A steam turbine works on the principal of conversion of energy. The energy in the steam stored in…

Q: Consider two identical rooms, one with a refrigerator in it and the other without refrigerator. If…

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Q: Which of the following statements are true for an adiabatic process? Check all that apply. During an…

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Q: Can heat flow either into or out of a substance without the substance changing temperature? If not,…

A: In general when a heat is imparted or taken away from a body, it is coupled with a change in…

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

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Q: In a thermodynamic process, 20 Joules are removed from a system as heat, and 30 Joules are added as…

A: Given: Heat removed from system H = -20 J Work done W= 30 J

Q: On a very hot day, could you cool your kitchen by leavingthe refrigerator door open?(a) Yes, but it…

A: Refrigerator door is open

Q: It is important for the body to be able to cool itself even during moderate exercise. Suppose a 70kg…

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Q: Heat transfer is always from higher reservoir to lower reservoir and not the opposite because:…

A: In Higher temperature, the atoms and molecules are in excited state. They are thermally agitated.

Q: The oceans contain a tremendous amount of thermal(internal) energy. Why, in general, is it not…

A: There has to be a differential in temperature for work to be accomplished. The temperatures above…

Q: In warm regions where tropical plants grow but the temperature may drop below freezing a few times…

A: In winters when the temperature may drop below freezing point a few times in tropical regions, the…

Q: Why don’t we operate ocean liners by extracting heat from the ocean or operate airplanes by…

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Q: What does the adiabatic process mean that it is used in refrigerators? The volume is constant. The…

A: For an adiabatic process  The amount of heat exchanged ( Absorbed or given out) must be zero. Let…

Q: Why is it impossible for a ship to use the internal energy of a sea water to operate its engine?

A: It is impossible for a ship to use the internal energy of sea water to operate its engine.

Q: What is the relationship between heat added to a system, change in its internal energy, and external…

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