Physics for Scientists and Engineers With Modern Physics
9th Edition
ISBN: 9781133953982
Author: SERWAY, Raymond A./
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Videos
Question
Chapter 20, Problem 2CQ
To determine
Whether to soak the cotton oven mitts in cold water or dry them to pick up the hot cooking pot comfortably.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
You need to pick up a very hot cooking pot in your kitchen. You have a pair of hot pads. Should you soak them in cold water or keep them dry in order to pick up the pot most comfortably?
Your granny normally took a hot 2L hot water bottle (covered with a thin towel and at 50 degrees Celsius) with her to bed on a very cold winters night and it worked quite well. She however decided to replace the water bottle with a huge 2 kg piece of iron (also covered with a towel at 50 degrees Celsius). She only used the 2kg piece of iron for one day and decided to rather always use the hot water bottle throughout the cold winter. Use your knowledge of Physics to explain why granny only used the hot piece of iron for ONE day and went back to using the hot water bottle aferwards.
You wish to buy a new freezer for your basement. The primary use of the freezer will be to prepare ice for family parties.
You have a very large family, with grandparents, parents, sisters, brothers, uncles, aunts, cousins, nephews, nieces, and
grandchildren. As a result, family birthday parties are held every couple of weeks, and you need lots of ice for drinks. You
want the freezer to convert 10.5 kg of water at 23.5°C to 10.5 kg of ice at -8.6°C in 2.00 h. But, in order to keep your
electric bill down, you want the power rating of the freezer to stay below 100 W. From these requirements, you determine
the minimum COP of the freezer that will satisfy your needs. (Consider that the specific heat of water is 4,186 J/(kg. °C),
the specific heat of ice is 2,090 J/(kg. °C), the latent heat of fusion of water is 3.33 x 105 J/kg, and the latent heat of
vaporization of water is 2.26 x 106 J/kg.)
COP =
Need Help? Read It
Chapter 20 Solutions
Physics for Scientists and Engineers With Modern Physics
Ch. 20.2 - Prob. 20.1QQCh. 20.3 - Prob. 20.2QQCh. 20.6 - Prob. 20.3QQCh. 20.6 - Characterize the paths in Figure 19.12 as...Ch. 20.7 - Prob. 20.5QQCh. 20 - Prob. 1OQCh. 20 - Prob. 2OQCh. 20 - Prob. 3OQCh. 20 - Prob. 4OQCh. 20 - Prob. 5OQ
Ch. 20 - Prob. 6OQCh. 20 - Prob. 7OQCh. 20 - Prob. 8OQCh. 20 - Prob. 9OQCh. 20 - Prob. 10OQCh. 20 - Prob. 11OQCh. 20 - Prob. 12OQCh. 20 - Prob. 13OQCh. 20 - Prob. 14OQCh. 20 - Prob. 15OQCh. 20 - Prob. 1CQCh. 20 - Prob. 2CQCh. 20 - Prob. 3CQCh. 20 - Prob. 4CQCh. 20 - Prob. 5CQCh. 20 - Prob. 6CQCh. 20 - Prob. 7CQCh. 20 - Prob. 8CQCh. 20 - Prob. 9CQCh. 20 - Prob. 10CQCh. 20 - Pioneers stored fruits and vegetables in...Ch. 20 - Prob. 12CQCh. 20 - Prob. 1PCh. 20 - Prob. 2PCh. 20 - Prob. 3PCh. 20 - The highest waterfall in the world is the Salto...Ch. 20 - Prob. 5PCh. 20 - The temperature of a silver bar rises by 10.0C...Ch. 20 - Prob. 7PCh. 20 - Prob. 8PCh. 20 - Prob. 9PCh. 20 - If water with a mass mk at temperature Tk is...Ch. 20 - Prob. 11PCh. 20 - Prob. 12PCh. 20 - Prob. 13PCh. 20 - Prob. 14PCh. 20 - Prob. 15PCh. 20 - Prob. 16PCh. 20 - Prob. 17PCh. 20 - How much energy is required to change a 40.0-g ice...Ch. 20 - Prob. 19PCh. 20 - Prob. 20PCh. 20 - Prob. 22PCh. 20 - In an insulated vessel, 250 g of ice at 0C is...Ch. 20 - Prob. 24PCh. 20 - Prob. 25PCh. 20 - Prob. 26PCh. 20 - One mole of an ideal gas is warmed slowly so that...Ch. 20 - Prob. 28PCh. 20 - Prob. 29PCh. 20 - A gas is taken through the cyclic process...Ch. 20 - Prob. 31PCh. 20 - Prob. 32PCh. 20 - A thermodynamic system undergoes a process in...Ch. 20 - Prob. 34PCh. 20 - A 2.00-mol sample of helium gas initially at 300...Ch. 20 - (a) How much work is done on the steam when 1.00...Ch. 20 - Prob. 37PCh. 20 - Prob. 38PCh. 20 - A 1.00-kg block of aluminum is warmed at...Ch. 20 - Prob. 40PCh. 20 - Prob. 41PCh. 20 - Prob. 42PCh. 20 - Prob. 43PCh. 20 - A concrete slab is 12.0 cm thick and has an area...Ch. 20 - Prob. 45PCh. 20 - Prob. 46PCh. 20 - Prob. 47PCh. 20 - Prob. 48PCh. 20 - Two lightbulbs have cylindrical filaments much...Ch. 20 - Prob. 50PCh. 20 - Prob. 51PCh. 20 - Prob. 52PCh. 20 - (a) Calculate the R-value of a thermal window made...Ch. 20 - Prob. 54PCh. 20 - Prob. 55PCh. 20 - Prob. 56PCh. 20 - Prob. 57PCh. 20 - Prob. 58APCh. 20 - Gas in a container is at a pressure of 1.50 atm...Ch. 20 - Prob. 60APCh. 20 - Prob. 61APCh. 20 - Prob. 62APCh. 20 - Prob. 63APCh. 20 - Prob. 64APCh. 20 - Review. Following a collision between a large...Ch. 20 - An ice-cube tray is filled with 75.0 g of water....Ch. 20 - Prob. 67APCh. 20 - Prob. 68APCh. 20 - An iron plate is held against an iron wheel so...Ch. 20 - Prob. 70APCh. 20 - Prob. 71APCh. 20 - One mole of an ideal gas is contained in a...Ch. 20 - Prob. 73APCh. 20 - Prob. 74APCh. 20 - Prob. 75APCh. 20 - Prob. 76APCh. 20 - Prob. 77APCh. 20 - Prob. 78APCh. 20 - Prob. 79APCh. 20 - Prob. 80APCh. 20 - Prob. 81CPCh. 20 - Prob. 82CPCh. 20 - Prob. 83CPCh. 20 - Prob. 84CP
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
- You wish to buy a new freezer for your basement. The primary use of the freezer will be to prepare ice for family parties. You have a very large family, with grandparents, parents, sisters, brothers, uncles, aunts, cousins, nephews, nieces, and grandchildren. As a result, family birthday parties are held every couple of weeks, and you need lots of ice for drinks. You want the freezer to convert 10.6 kg of water at 21.0°C to 10.6 kg of ice at −8.8°C in 2.00 h. But, in order to keep your electric bill down, you want the power rating of the freezer to stay below 100 W. From these requirements, you determine the minimum COP of the freezer that will satisfy your needs. (Consider that the specific heat of water is 4,186 J/(kg · °C), the specific heat of ice is 2,090 J/(kg · °C), the latent heat of fusion of water is 3.33 ✕ 105 J/kg, and the latent heat of vaporization of water is 2.26 ✕ 106 J/kg.) Find the coefficient of performance (COP).arrow_forwardYou wish to buy a new freezer for your basement. The primary use of the freezer will be to prepare ice for family parties. You have a very large family, with grandparents, parents, sisters, brothers, uncles, aunts, cousins, nephews, nieces, and grandchildren. As a result, family birthday parties are held every couple of weeks, and you need lots of ice for drinks. You want the freezer to convert 10.6 kg of water at 23.0°C to 10.6 kg of ice at −9.2°C in 2.00 h. But, in order to keep your electric bill down, you want the power rating of the freezer to stay below 100 W. From these requirements, you determine the minimum COP of the freezer that will satisfy your needs. (Consider that the specific heat of water is 4,186 J/(kg · °C), the specific heat of ice is 2,090 J/(kg · °C), the latent heat of fusion of water is 3.33 ✕ 105 J/kg, and the latent heat of vaporization of water is 2.26 ✕ 106 J/kg.)arrow_forwardYou are boiling pasta and absentmindedly grab a copper stirring spoon rather than your wooden spoon. The copper spoon has a 25 mm x 1.8 mm rectangular cross section, and the distance from the boiling water to your 35°C hand is 18 cm. How long does it take the spoon to transfer 40 J of energy to your hand?arrow_forward
- You are asked to design a heating system for a swimming pool that is 2 m deep, 25 m long, and 25 m wide. Your client desires that the heating system be large enough to raise the water temperature from 20 to 30°C in 3 h. The rate of heat loss from the water to the air at the outdoor design conditions is determined to be 960 W/m2, and the heater must also be able to maintain the pool at 30°C at those conditions. Heat losses to the ground are expected to be small and can be disregarded. The heater considered is a natural gas furnace whose efficiency is 80 percent. What heater size (in kW input) would you recommend to your client?arrow_forwardBrewed coffee is often too hot to drink right away. You can cool it with an ice cube, but this dilutes it. Or you can buy a device that will cool your coffee without dilution—a 200 g aluminum cylinder that you take from your freezer and place in a mug of hot coffee. If the cylinder is cooled to –20°C, a typicalfreezer temperature, and then dropped into a large cup of coffee (essentially water, with a mass of 500 g) at 85°C, what is the final temperature of the coffee?arrow_forwardFor bacteriological testing of water supplies and in medical clinics, samples must routinely be incubated for 24 h at 37°C. A standard constant - temperature bath with electric heating and thermostatic control is not suitable in developing nations without continuously operating electric power lines. Peace Corps volunteer and MIT engineer Amy Smith invented a low - cost, low-maintenance incubator to fill the need. The device consists of a foam-insulated box containing several packets of a waxy material that melts at 37.0°C, interspersed among tubes, dishes, or bottles containing the test samples and growth medium (food for bacteria). Outside the box, the waxy material is first melted by a stove or solar energy collector. Then it is put into the box to keep the test samples warm as it solidifies. The heat of fusion of the phase-change material is 205 kJ/kg. Model the insulation as a panel with surface area 0.490 m2, thickness 9.50 cm, and conductivity 0.012 0 W/m ∙ °C. Assume the…arrow_forward
- A helium balloon consists of a large bag loosely filled with 560 kg of helium at an initial temperature of 12°C. While exposed to the heat of the Sun, the helium gradually warms to a temperature of 31°C. The heating proceeds at a constant pressure of 1.0 atm. How much heat does the helium absorb during this temperature change?arrow_forwardIt’s a hot day, and your apartment is rather warm. Your roommate suggests cooling off the apartment by keeping the door of the refrigerator open. Will this help the situation?arrow_forwardA window air conditioner is placed on a table inside a well-insulated apartment, plugged in and turned on. What happens to the average temperature of the apartment? (a) It increases. (b) It decreases. (c) It remains constant. (d) It increases until the unit warms up and then decreases. (e) The answer depends on the initial temperature of the apartment.arrow_forward
- In the morning of a hot day, you and your friends decide to have a picnic. You buy some drinks and load them, with ice, in a cooler. In order to keep the drinks as cold as possible, one of your friends decides to cover the cooler with a wool blanket. Would this actually keep the drinks cold or it just going to warm them?arrow_forwardA pressure cooker cooks a lot faster than an ordinary pan by maintaining a higher pressure and temperature inside. The lid of a pressure cooker is well sealed, and steam can escape only through an opening in the middle of the lid. A separate metal piece, the petcock, sits on top of this opening and prevents steam from escaping until the pressure force overcomes the weight of the petcock. The periodic escape of the steam in this manner prevents any potentially dangerous pressure buildup and keeps the pressure inside at a constant value. Determine the mass of the petcock of a pressure cooker whose operation pressure is 100 kPa gage and has an opening crosssectional area of 4 mm2. Assume an atmospheric pressure of 101 kPa, and draw the freebody diagram of the petcock.arrow_forwardWhat is the correct formula for obtaining heat when the temperature of an object changes?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
Physics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
College PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College
Glencoe Physics: Principles and Problems, Student...PhysicsISBN:9780078807213Author:Paul W. ZitzewitzPublisher:Glencoe/McGraw-Hill
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Cengage Learning
Physics for Scientists and Engineers with Modern ...
Physics
ISBN:9781337553292
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
College Physics
Physics
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:OpenStax College
Glencoe Physics: Principles and Problems, Student...
Physics
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Glencoe/McGraw-Hill
Thermal Expansion and Contraction of Solids, Liquids and Gases; Author: Knowledge Platform;https://www.youtube.com/watch?v=9UtfegG4DU8;License: Standard YouTube License, CC-BY