A 4-ton air conditioner removes 5.06×107 J (48,000 British thermal units) from a cold environment in 1.00 h. (a) What energy input in joules is necessary to do this if the airconditioner has an energy efficiency rating ( EER ) of 12.0?(b) What is the cost of doing this if the work costs 10.0 centsper 3.60×106 J (one kilowatt-hour)?                                                                 (c) Discuss whether this cost seems realistic. Note that the energy efficiency rating ( EER ) of an air conditioner or refrigerator is defined to be the number of British thermal units of heat transfer from a cold environment per hour divided by the watts of power input.

Q: Energy that is not utilized for work or heat transfer in the human body is converted to the chemical…

A: The total energy burns is, Eburn=1.2 kcal/min8 hours60 min1 hour+1.7 kcal/min16 hours60 min1…

Q: A certain coal-fired power plant has a rated power capacity of P = 950 MW. The output of this plant…

A:

Q: The total mass of a paratrooper - the person and all the gear - is 118kg. the paratrooper jumps out…

A:

Q: 1.An electric kettle transfers 900 000 J of energy to some water in 10 minutes. (a) Estimate the…

A:

Q: How much energy would you consume daily if you kept a lightbulb of 20 watts on all day long?

A: A lightbulb is rated as 20 Watt which is indicating the power of the bulb.  P = E/t  Power is…

Q: A 46-kg woman cheats on her diet and eats a 685-Calorie (685 kcal) jelly doughnut for breakfast.…

A:

Q: The U.S. Department of Energy estimates that up to 10 percent of the energy use of a house can be…

A: Annual energy cost,

Q: Convert 7.87 x 103 cal to the equivalent number of kilocalories (also known as Calories, used to…

A: Consider the conversion formula as given below. 1 kcal=103 cal 1 cal=4.184 J

Q: 1. A coal-fired power plant produces 9.00 × 1013 J of electrical energy in one day, and operates…

A:

Q: A weight lifter bench‑presses a 150.0 kg barbell from his chest to a height equal the length of his…

A: Solution:   Given Values, Mass of barbell (m)=150 KgHeight (h)=0.850 m

Q: That same 0.005 kg is dropped off of the top of the Empire State building, which is about 443 meters…

A: Answer:   Given data: Mass (m) = 0.005 KgHeight (h)=443 mFinal Velocity (v)= 5.28 m/sInitial…

Q: toaster heater is heated up to a temperature of 584 degrees C. The emissivity of the toaster heater…

A:

Q: A gas is compressed inside a cylinder. An average force of 27 N acts to move the piston 2.5 m.…

A: Average force = 27 N  Distance moved = 2.5 m  Heat conducted away from gas = 8 Joules

Q: A PHYS 1510 student was working on a robotics project. The joints on the machine they were building…

A:

Q: 9. A physics student decides to “burn off” some Calories by climbing a ladder. As the ladder is…

A: Part (a) Given data: The mass of the student is m=75 kg. The calories to burn off is E=1 Calorie…

Q: When a certain type of coal is burned at a power plant, 22.6 ×106×106 joules per kilogram are…

A:

Q: Problem 1: Suppose a man does 35.5 kJ of work with an efficiency of 4.95 %. How much food energy, in…

A: Given Data, Work Done by the man (W)=35.5 kJ Efficiencyη=4.95 %

Q: 3.5x10^7 J of heat transfers into an engine. If 2.1x10^7 J of work is performed what is the…

A:

Q: (a) How many joules of energy are the equivalent of one jelly doughnut? (b) How many stairs must the…

A: The weight of the woman is w=58 kg. The woman eats 555 kcal.

Q: A power plant burns coal and generates an average of 615.0 MW of electrical power while discharging…

A: Given Information:- Electrical power generated by the plant is E=615.0 MW Waste heat H=1020.90 MW…

Q: A certain coal-fired power plant has a rated power capacity of P = 850 MW. The output of this plant…

A: Given that :- Power capacity , P=850 MW  Output , W=0.26Q11

Q: In a thermodynamic process, a system absorbs 755 kJ of heat and does 117 kJ of work on its…

A:

Q: A 46-kg woman cheats on her diet and eats a 555-Calorie (555 kcal) jelly doughnut for breaktast. (a)…

A: In this question it is given that a woman with weight 46 kg  is on dieting she cheats her diet and…

Q: A heat engine takes in 2500J and does 1500J of work.   a) How much energy is expelled as waste?…

A: Given Data: The heat supplied to the engine is: Qs=2500 J The work produced by the engine is: W=1500…

Q: A 46-kg woman eats a 522 Calorie (522 kcal) jelly doughnut for breakfast. (a) How many joules of…

A: Given: mass of woman, m = 46 kg doughnut jelly energy, E= 522 calorie To Find: (a) Joule of energy…

Q: In performing 154.0 J of work, an engine exhausts 65.0 J of heat. What is the efficiency of the…

A: The given values are, W=154.0 JQL=65.0 J

Q: A farmhand lifts a 23.5-kg bale of hay to a height H = 1.1 m to get it into the back of a flatbed…

A: As per guidelines , only first question is solved here. Given, Mass of a bale of hay , m = 23.5 kg…

Q: How much energy would you consume daily if you kept 3 lightbulbs of 25 watts on all day long?.

A:

Q: An electrical power station uses 1.33 1014 J of heat input with an efficiency of 34.7%. (a) How…

A: The efficiency of the electrical power station is given by: η=WQiwhere,η is the efficiencyW is the…

Q: Can you help 2a and subpart 2b  1. A certain power plant produces useful work (i.e. electricity) at…

A: The energy produced can be calculate by using the formula Eo=Pt , where P=900×106 J/s is the power…

Q: What is the change in internal energy of a system which does 0.42 J of work while 8.87 J of heat…

A:

Q: If a heat engine pulls 8330.0 J of heat from the hot reservoir and exhausts 6938.9 J of heat to the…

A:

Q: If I add 38,626 J of energy to an ideal gas inside a balloon, causing the internal energy to…

A: Given, ∆U=6997 J Q=38,626 J

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.