Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
4th Edition
ISBN: 9780134110684
Author: Randall D. Knight (Professor Emeritus)
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 21, Problem 7CQ
A
this relationship?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
In a household during a particular week three 2kW fires are used on average 25 h each and
eight 100W light bulbs are used on average 35 h each. Determine the cost of electricity for
the week if 1 unit of electricity costs 12.82 p.
Compare the cost to make 48 kg of ice using two different refrigerators; one has a COP of 5.00 and the other has a COP of 6.00. Electricity costs $0.10 per kWh. Using the same assumptions given in the example, find the cost difference (in dollars) between the refrigerators to freeze the water.
Suppose a utility generates electricity with a 32% efficient coal-fired power plant that emits
SO₂ at the legal limit of 0.6 lb per million Btu of heat into the plant. If the utility customers
replace their 75W incandescent light bulbs with 18W compact fluorescent lights (CFL), then:
a) Over the 10,000hr lifetime of each CFL, how many kW.hr of electricity is saved?
Answer: 570 kW.hr
b) How much SO₂ is not emitted due to this change?
Note: the conversion factor from kW to Btu/hr is 3,412 kW/Btu.hr
Answer: 3.65 lb
c) How much would the utility save per CFL if it can sell its right to emit SO₂ at the price of
$800 per ton, given that there are 2,000lb in a ton?
Answer: $1.44
Chapter 21 Solutions
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
Ch. 21 - Prob. 1CQCh. 21 - Rank in order, from largest to smallest, the...Ch. 21 - Prob. 3CQCh. 21 - FIGURE Q21.4 shows the pV diagram of a heat...Ch. 21 - Rank in order, from largest to smallest, the...Ch. 21 - FIGURE Q21.6 shows the thermodynamic cycles of two...Ch. 21 - A heat engine satisfies Wout= Qnet. Why is there...Ch. 21 - Prob. 8CQCh. 21 - Prob. 9CQCh. 21 - Prob. 10CQ
Ch. 21 - Prob. 11CQCh. 21 - Prob. 1EAPCh. 21 - Prob. 2EAPCh. 21 - Prob. 3EAPCh. 21 - Prob. 4EAPCh. 21 - Prob. 5EAPCh. 21 - Prob. 6EAPCh. 21 - The power output of a car engine running at 2400...Ch. 21 - Prob. 8EAPCh. 21 - Prob. 9EAPCh. 21 - Prob. 10EAPCh. 21 - Prob. 11EAPCh. 21 - Prob. 12EAPCh. 21 - Prob. 13EAPCh. 21 - Prob. 14EAPCh. 21 - Prob. 15EAPCh. 21 - Prob. 16EAPCh. 21 - A heat engine uses a diatomic gas in a Brayton...Ch. 21 - At what pressure ratio does a Brayton cycle using...Ch. 21 - Prob. 19EAPCh. 21 - Prob. 20EAPCh. 21 - Prob. 21EAPCh. 21 - Prob. 22EAPCh. 21 - Prob. 23EAPCh. 21 - Prob. 24EAPCh. 21 - Prob. 25EAPCh. 21 - Prob. 26EAPCh. 21 - Prob. 27EAPCh. 21 - A Carnot engine whose hot-reservoir temperature is...Ch. 21 - Prob. 29EAPCh. 21 - A heat engine operating between energy reservoirs...Ch. 21 - Prob. 31EAPCh. 21 - A Carnot refrigerator operating between —20°C and...Ch. 21 - The coefficient of performance of a refrigerator...Ch. 21 - A Carnot heat engine with thermal efficiency 1/3...Ch. 21 - Prob. 35EAPCh. 21 - Prob. 36EAPCh. 21 - A heat engine with 50% of the Carnot efficiency...Ch. 21 - Prove that the work done in an adiabatic process i...Ch. 21 - Prob. 39EAPCh. 21 - Prob. 40EAPCh. 21 - An ideal refrigerator utilizes a Carnot cycle...Ch. 21 - Prob. 42EAPCh. 21 - There has long been an interest in using the vast...Ch. 21 - A Carnot heat engine operates between reservoirs...Ch. 21 - A Carnot engine operates between temperatures of...Ch. 21 - Prob. 46EAPCh. 21 - A Carnot heat engine and an ordinary refrigerator...Ch. 21 - 48. A heat engine running backward is called a...Ch. 21 - 49. A car's internal combustion engine can be...Ch. 21 - Prob. 50EAPCh. 21 - Prob. 51EAPCh. 21 - Prob. 52EAPCh. 21 - Prob. 53EAPCh. 21 - Prob. 54EAPCh. 21 - Prob. 55EAPCh. 21 - Prob. 56EAPCh. 21 - Prob. 57EAPCh. 21 - A heat engine using a monatomic gas follows the...Ch. 21 - Prob. 59EAPCh. 21 - Prob. 60EAPCh. 21 - Prob. 61EAPCh. 21 - Prob. 62EAPCh. 21 - Prob. 63EAPCh. 21 - Prob. 64EAPCh. 21 - Prob. 65EAPCh. 21 - Prob. 66EAPCh. 21 - Prob. 67EAPCh. 21 - Prob. 68EAPCh. 21 - Prob. 69EAPCh. 21 - Prob. 70EAPCh. 21 - A refrigerator using helium gas operates on the...Ch. 21 - Prob. 72EAPCh. 21 - The gasoline engine in your car can be modeled as...Ch. 21 - Prob. 74EAP
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Suppose you have a 1000Wmicrowave that you need to run for 5minto heat up your dinner.1. How much energy does it take to heat up your dinner?2. At$0.12/kWhr, how long much does it cost to warm up your dinner?arrow_forwardA 220-volt 2 ampere electric kettle contains 5 kg. of water at 21° C. It is required to bring it to boiling in 20 mínutes. Determíne the efficiency of the kettle.arrow_forwardIf 370 J of work is performed with 45% efficiency, what is the amount of energy that goes into heating, parasitic losses, etc.? Give your answer in units of joules, to three significant figures.arrow_forward
- A 2 ohm heater takes 5 amperes while submerged in 1400 grams of water contained in a vessel with a water equivalent to 100 grams. What is the efficiency of the system if the time required for the temperature to change by 80 degrees celsius is 3.1007 hours.arrow_forwardHow much energy in jouls does a (5.14x10^1) W toaster use in the morning if it is in operation for a total (4.000x10^0) min? Give your answer to 3 sf. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answerarrow_forwardsometimes the hot water produced by a solar water heater is not warm enough to mee the needs of the occupants of a building. A traditional water heater inside the building supplies additional thermal energy to the solar warmed water. How can this method still reduce the overalll amount of natural gas or electrical energy a building uses?arrow_forward
- I often make tea in my microwave oven. I know that it takes two minutes to bring the temperature of a cup of water from room temperature to just about boiling: ready for the teabag. I looked up the characteristics of a microwave oven. Typically their power rating is about 1000 W, but I know that this is the power consumed from the power company, not the power delivered to the water. I looked up the efficiency of microwave ovens, and found that it is about 64%, meaning that a typical oven delivers 640 W to the water. I also looked up the frequency of the microwaves that an oven uses, and found thatf= 2,450 MHz. (a) How much energy is delivered to the water in the making of a cup of tea? (b) What is the wavelength of the microwave? (c) What is the energy of one microwave photon? (d) How many microwave photons are absorbed by the water in making a cup of tea?arrow_forwardMany decisions are made on the basis of the payback period: the time it will take through savings to equal the capital cost of an investment. Acceptable payback times depend upon the business or philosophy one has. For some industries, a payback period is as small as 2 yeas) Suppose you wish to install the extra insulation in the preceding problem. If energy cost $1.00 per million joules and the insulation was $4.00 per square meter, then calculate the simple payback time. Take the average T for the 120-day heating season to be 15.0 .arrow_forwardAn infrared heater for a sauna has a surface area of 0.050 m2 and an emissivity of 0.84. What temperature must it run at if the required power is 360 W? Neglect the temperature of the environment.arrow_forward
- An engine absorbs three times as much heat as it discharges. The work done by the engine per cycle is 50 J. Calculate (a) the efficiency of the engine, (b) the heat absorbed per cycle, and (c) the heat discharged per cycle.arrow_forward(a) How much energy is necessary to heat 2.5 kg of water from room temperature (20°C) to its boiling point? (Assume no energy loss.)1971080 kcal(b) If electrical energy were used, how much would this cost at 55¢ per kWh?¢arrow_forwardHow much heat QH does a heat pump with a coefficient of performance of 2.00 deliver when supplied with 4.10 kJ of electricity? Он Jarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
The Second Law of Thermodynamics: Heat Flow, Entropy, and Microstates; Author: Professor Dave Explains;https://www.youtube.com/watch?v=MrwW4w2nAMc;License: Standard YouTube License, CC-BY