An electric power plant uses energy from burning coal to generate steam at 450°C. The plant is cooled by 20°C water from a nearby river. If burning coal provides 100 MJ of heat, what is the theoretical minimum amount of heat that must be transferred to the river during the conversion of heat to electricenergy?

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: A passive solar house that is losing heat to the outdoors at 3°C at an average rate of 50,000 kJ/h…

A:

Q: A steam pipe is covered with 1.50-cm thick insulating material of thermal conductivity of 0.200…

A: Here, the thickness of the pipe is, 1.50 cm.  The thermal conductivity is 0.200 cal/cm ·°C. Since, 1…

Q: Choose the number that corresponds the following questions and statements.   Which of the below is…

A:

Q: The freezing point of mercury is -38.8 degree Celsius. What quantity of energy in joules is released…

A:

Q: A heat pump with a COP of 2.5 supplies ener gy to a house at a rate of 60,000 Btu/h. Determine (a)…

A: a) The COP is given by,

Q: . A bullet of mass 10 g moving with speed of 210 m/s in stopped suddenly. If all its kinetic energy…

A:

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: A bullet of mass 10 g moving with speed of 210 m/s in stopped suddenly. If all its kinetic energy is…

A: Given data :- m = 10 g = 0.01 kg v = 210 m/s

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

A: (a)   The energy input of the air conditioner can be calculated as,

Q: BMR Basal Metabolic Rate is the rate of heat energy generation when a person is at rest. Some diet…

A:

Q: Three 20.0 g ice cubes are dropped into 200 g of water in a thermally insulated container. If the…

A: Let final temperature be T mass of ice= 20 g mass of water= 200 g cw= 1 cal/gK ci= 0.53  cal/gK L=…

Q: When someone has a fever, his or her body temperature might increase by as much as 2°C. Suppose this…

A: The given values are, ΔT=2° Cm=48 kg

Q: A large electrical power station generates 921 MW of electricity with an efficiency of 39.6%.…

A:

Q: 250 J of heat leaves the system and 355.75 J of work is done on the system. Get the change of…

A: Given value--- 250 J of heat leaves the system . 355.75 J of work is done on the system. We have…

Q: A cube of ice is taken from the freezer at -6.5 ∘C∘C and placed in a 95-gg aluminum calorimeter…

A: using princip[le of calorimetry      heat gained by ice = heat lost by aluminium + water

Q: What is the change in internal energy of a system which does 4.50×105J of work while 3.00×106 J of…

A: The change in internal energy(ΔU) of a system.given,workdone(W)=4.50×105 J Heat goes…

Q: Which of the following statements about heat transfer is NOT true? O The rate at which heat is…

A:

Q: What is the change in internal energy of a system which does 4.50×105 J of work while 3.00×106 J of…

A: The heat transfer in this case is

Q: A hermetically sealed room 4 m x 4 m x 4 m has an internal sensible heat gain of 3 kW. The overall…

A: The  heat loss can be determined by, Q=h×A×T0-Ts

Q: An energetic athlete can use up all the energy from a diet of 4000 Cal/day. If he were to use up…

A:

Q: Which of the following indicates a heat transfer?   Question 15 options:   constant temperature…

A: Heat transfer: Heat transfer is a process of energy transfer from one place to another place due to…

Q: A bullet of mass 10 g moving with speed of 210 m/s in stopped suddenly. If all its kinetic energy is…

A:

Q: How much work must be done by this heat pump to supply 2550 J of heat on a day when the outside…

A: Given data : Heat supply to heat pump is, Q=2550 J. Outside temperature is, To=253 K.

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: A 5.0kg pan of water has an initial temperature of 15 degrees Celsius to bring to a boil.  How much…

A: The mass of pan of water (m),

Q: 6. Water has a specific heat of 4184 J/Kg°C. Ethanol has a specific heat of 2440 J/Kg°C. What…

A: Given data :  Specific heat of water ( cw ) = 4184 J/kg°C  Specific heat of ethanol ( ce ) = 2440…

Q: . You do 10,000 J of work on a system of 3.00 kg water by stirring it with a paddle wheel. During…

A:

Q: During a process, the internal energy of a system increases by 16 Kj, at the same time it performs a…

A: According to the first law of thermodynamics,  dQ = dU + dW  where, dQ is the heat supplied, dU is…

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: We are able to define a mechanical equivalent for heat because O work can be converted into thermal…

A: Mechanical energy can be converted into heat, and heat can be converted into some mechanical energy.…

Q: After eating a 200 g bottle of yogurt, Bob decides to go for a run to burn off the extra energy. The…

A: Given: Mass of the yogurt eaten by bob = 200 g Energy from the yogurt = 5.4 MJ/kg Metabolic rate of…

Q: The air temperature above coastal areas is profoundly influenced by the large specific heat of…

A:

Q: A thermodynamic system undergoes a process where its internal energy increases by 200 J. During this…

A: The change in internal energy of the system,

Q: A heat pump is used to maintain a house at a constant temperature of 23°C. The house is losing heat…

A:

Q: A runner generates 1260 W of thermal energy. If this heat has to be removed only by evaporation, how…

A: Given, time=15min=15x60=900s Thermal Energy = 1260W= 1260 J/s So, total energy produced in 15 min=…

Q: A gasoline engine has a power output of 180 kW. Its thermal efficiency is 0.28. How much heat must…

A: Write the given values with suitable variables. Pout=180 kWη=0.28 Here, Pout denotes the output…

Q: An engine does 18,500J of work and rejects 6550 J of heat into a cold reservoir whose temperature is…

A:

Q: The heating curve below shows the change in temperature of a 20 g sample of a substance as energy is…

A: mass= 20 x 10-3 kg

Q: What is the change in internal energy of a system which does 6.5×105 J of work while 3.00×106 J of…

A:

Q: A gasoline engine has a power output of 155 kW (about 2.08x105 hp ). Its thermal efficiency is 32.0…

A:

Q: To speed the process of ice melting, you can smash the ice up into smaller pieces, via a tool such…

A:

Q: In Rusayl cable factory, 150 kg of raw copper is molten to make wires and cables. If 20.1 MJ of heat…

A: Given: The mass of raw copper is m=150 kg. The heat required is Q=20.1 MJ.   The expression of…

Q: What is the change in internal energy (in J) of a system that does 4.50 ✕ 105 J of work while 3.40 ✕…

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.