University Physics Volume 2
18th Edition
ISBN: 9781938168161
Author: OpenStax
Publisher: OpenStax
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Chapter 1, Problem 28CQ
Mechanisms of
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Mechanism of Heat Transfer A vacuum flask or commonly known as thermos bottle is a material that minimizes transfer of heat from the object inside to the surrounding. How does this object minimize heat transfer? HINT: Observe the materials that compose your thermos bottle and its interior. Evaluate how these materials emphasize the mechanism of heat transfer.
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A cool breeze blows off the water. O Conduction Convection O Radiation O No heat transfer takes place .
Chapter 1 Solutions
University Physics Volume 2
Ch. 1 - Check Your Understanding Does a given reading on a...Ch. 1 - Check Your Understanding Two objects A and B have...Ch. 1 - Check Your Understanding If 25 kJ is necessary to...Ch. 1 - Check Your Understanding Explain why a cup of...Ch. 1 - Check Your Understanding Why does snow Often...Ch. 1 - Check Your Understanding Name an example from...Ch. 1 - Check Your Understanding How does the rate of heat...Ch. 1 - Check Your Understanding Explain why using a fan...Ch. 1 - Check Your Understanding How much greater is the...Ch. 1 - What does it mean to say that two systems are in...
Ch. 1 - Give an example in which A has some kind of...Ch. 1 - If a thermometer is allowed to come to equilibrium...Ch. 1 - Give an example of a physical property that varies...Ch. 1 - Pouring cold water into hot glass or ceramic...Ch. 1 - One method of getting a tight fit, say of a metal...Ch. 1 - Does it really help to run hot water over a tight...Ch. 1 - When a cold alcohol thermometer is placed in a hot...Ch. 1 - Calculate the length of a 1-meter rod of a...Ch. 1 - Noting the large stresses that can be caused by...Ch. 1 - How is heat transfer related to temperature?Ch. 1 - Describe a situation in which heat transfer...Ch. 1 - When heat transfers into a system, is the energy...Ch. 1 - The brakes in a car increase in temperature by T...Ch. 1 - A pressure cooker contains water and steam in...Ch. 1 - As shown below, which is the phase diagram for...Ch. 1 - Can carbon dioxide be liquefied at room...Ch. 1 - What is the distinction between gas and vapor?Ch. 1 - Heat transfer can cause temperature and phase...Ch. 1 - How does the latent heat of fusion of water help...Ch. 1 - What is the temperature of ice right after it is...Ch. 1 - If you place 0 ice into 0 water in an insulated...Ch. 1 - What effect does condensation on a glass of ice...Ch. 1 - In Miami, Florida, which has a very humid climate...Ch. 1 - In winter, it is often warmer in San Francisco...Ch. 1 - Freeze-dried foods have been dehydrated in a...Ch. 1 - In a physics classroom demonstration, an...Ch. 1 - Mechanisms of Heat Transfer What are the main...Ch. 1 - When our bodies get too warm, they respond by...Ch. 1 - Shown below is a cut-away drawing of a thermos...Ch. 1 - Some electric stoves have a flat ceramic surface...Ch. 1 - Loose-fitting white clothing covering most of the...Ch. 1 - One way to make a fireplace more energy-efficient...Ch. 1 - On cold, clear nights horses will sleep under the...Ch. 1 - When watching a circus during the day in a large,...Ch. 1 - Satellites designed to observe the radiation from...Ch. 1 - Why are thermometers that ale used in weather...Ch. 1 - Putting a lid on a boiling pot greatly reduces the...Ch. 1 - Your house will be empty for a while in cold...Ch. 1 - You pour coffee into an unlidded cup, intending to...Ch. 1 - Broiling is a method of cooking by radiation,...Ch. 1 - On a cold winter morning, why does the metal of a...Ch. 1 - While traveling outside the United States, you...Ch. 1 - What are the following temperatures on the Kelvin...Ch. 1 - (a) Suppose a cold front blows into your locale...Ch. 1 - An Associated Press article on climate change...Ch. 1 - (a) At what temperature do the Fahrenheit and...Ch. 1 - A person taking a reading of the temperature in a...Ch. 1 - The height of the Washington Monument is measured...Ch. 1 - How much taller does the Eiffel Tower become at...Ch. 1 - What is the change in length of a 3.00-cm-long...Ch. 1 - How large an expansion gap should be left between...Ch. 1 - You are looking to buy a small piece of land in...Ch. 1 - Global warming will produce rising sea levels...Ch. 1 - (a) Suppose a meter stick made of steel and one...Ch. 1 - (a) If a 500-mL glass beaker is filled to the brim...Ch. 1 - Most cars have a coolant reservoir to catch...Ch. 1 - A physicist makes a cup of instant coffee and...Ch. 1 - The density of water at 0 C is very nearly 1000...Ch. 1 - Show that =3a , by calculating the infinitesimal...Ch. 1 - Calorimetry On a hot day, the temperature of an...Ch. 1 - To sterilize a 50.0-g glass baby bottle, we must...Ch. 1 - The same heat transfer into identical masses of...Ch. 1 - Rubbing your hands together warms them by...Ch. 1 - A 0.250-kg block of a pule material is heated from...Ch. 1 - Suppose identical amounts of heat transfer into...Ch. 1 - (a) The number of kilocalories in food is...Ch. 1 - Following vigorous exercise, the body...Ch. 1 - In a study of healthy young men[1], doing 20...Ch. 1 - A 1.28-kg sample of water at 10.0 is in a...Ch. 1 - Repeat the preceding problem, assuming the water...Ch. 1 - How much heat transfer (in kilocalories) is...Ch. 1 - A bag containing 0 ice is much more effective in...Ch. 1 - (a) How much heat transfer is required to raise...Ch. 1 - Condensation on a glass of ice water causes the...Ch. 1 - On a trip, you notice that a 3.50-kg bag of ice...Ch. 1 - On a certain dry sunny day, a swimming pool 's...Ch. 1 - (a) How much heat transfer is necessary to raise...Ch. 1 - In 1986, an enormous iceberg broke away from the...Ch. 1 - How many grams of coffee must evaporate from 350 g...Ch. 1 - (a) It is difficult to extinguish a fire on a...Ch. 1 - The energy released from condensation in...Ch. 1 - To help prevent frost damage, 4.00 kg of water at...Ch. 1 - A 0.250-kg aluminum bowl holding 0.800 kg of soup...Ch. 1 - A 0.0500-kg ice cube at 30.0 is placed in 0.400...Ch. 1 - If you pour 0.0100 kg of 20.0 water onto a...Ch. 1 - Indigenous people sometimes cook in watertight...Ch. 1 - What would the final temperature of the pan and...Ch. 1 - (a) Calculate the rate of heat conduction through...Ch. 1 - The rate of heat conduction out of a window on a...Ch. 1 - Calculate the rate of heat conduction out of the...Ch. 1 - Suppose you stand with one foot on ceramic...Ch. 1 - A man consumes 3000 kcal of food in one day,...Ch. 1 - A firewalker runs across a bed of hot coals...Ch. 1 - (a) What is the rate of heat conduction through...Ch. 1 - A warms transfers energy by conduction through its...Ch. 1 - Compare the rate of heat conduction through a...Ch. 1 - Suppose a person is covered head to foot by wool...Ch. 1 - Some stove tops are smooth ceramic for easy...Ch. 1 - One easy way to reduce heating (and cooling) costs...Ch. 1 - Many decisions are made on the basis of the...Ch. 1 - In 1701, the Danish astronomer Ole Rømer proposed...Ch. 1 - What is the percent error of thinking the melting...Ch. 1 - An engineer wants to design a structure in which...Ch. 1 - How much stress is cleated in a steel beam if its...Ch. 1 - A brass rod (Y=90109N/m2), with a diameter of...Ch. 1 - A mercury thermometer still in use for meteorology...Ch. 1 - Even when shut down after a period of normal use,...Ch. 1 - You leave a pastry in the refrigerator on a plate...Ch. 1 - Two solid spheres, A and B, made of the same...Ch. 1 - In some countries, liquid nitrogen is used on...Ch. 1 - Some gun fanciers make their own bullets, which...Ch. 1 - A 0.800-kg iron cylinder at a temperature of...Ch. 1 - Repeat the preceding problem with 2.00 kg of ice...Ch. 1 - Repeat the preceding problem with 0.500 kg of ice,...Ch. 1 - A 30.0-g ice cube at its melting point is dropped...Ch. 1 - (a) Calculate the rate of heat conduction through...Ch. 1 - (a) An exterior wall of a house is 3 m tall and 10...Ch. 1 - For the human body, what is the rate of heat...Ch. 1 - You have a Dewar flask (a laboratory vacuum flask)...Ch. 1 - An infrared heater for a sauna has a surface area...Ch. 1 - (a) Deter-nine the power of radiation from the Sun...Ch. 1 - A pendulum is made of a rod of length L and...Ch. 1 - At temperatures of a few hundred kelvins the...Ch. 1 - In a calorimeter of negligible heat capacity, 200...Ch. 1 - An astronaut performing an extra-vehicular...Ch. 1 - The goal in this problem is to find the growth of...Ch. 1 - As the very first rudiment of climatology,...Ch. 1 - Let's stop ignoring the greenhouse effect and...
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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
- Integrated Concepts Heat transfers from your lungs and breathing passages by evaporating water. (a) Calculate the maximum number of grams of water that can be evaporated when you inhale 1.50 L of 37C air with an original relative humidity of 40.0%. (Assume that body temperature is also 37C .) (b) How many joules of energy are required to evaporate this amount? (c) What is tile rate of heat transfer in watts from this method, if you breathe at a normal resting rate of 10.0 breaths per minute?arrow_forwardSubstance Steam water Ice → water Latent Heat (J/kg) 2,260,000 333,000 Answer the following questions dealing with methods of heat transfer. Radiation An orange orb has an emissivity of 0.535 and its surroundings are at 204°C. The orange orb is absorbing heat via radiation at a rate of 851 W and it is emitting heat via radiation at a rate of 470 W. Determine the surface area of the orb, the temperature of the orb, & Pnet A = Torb = Р. net = ☐ Convection The exterior walls of a house have a total area of 180 m² and are at 12.9°C and the surrounding air is at 7.7° C. Find the rate of convective cooling of the walls, assuming a convection coefficient of 3.4 W/(m².°C). Since you're looking for the rate of cooling, your answer should be entered as positive. □ Conduction Ice of mass 11.2 kg at 0°C is placed in an ice chest. The ice chest has 3 cm thick walls of thermal conductivity 0.06 W/m.K and a surface area of 1.31 m². Express your answers with appropriate mks units. (a) How much heat…arrow_forwardHeat is? a.) the amount of thermal energy in an object. b.) the energy that moves from a hotter object to a colder object. c.) a fluid-like substance that flows from a hotter object to a colder object. d.) all of the abovearrow_forward
- The heat transfer surface area of a fin is equal to the sum of all surfaces of the fin exposed to the surrounding medium, including the surface area of the fin tip. Under what conditions can we neglect heat transfer from the fin tip?arrow_forwardWhy the sand is much hotter compared to water in the beach if they are exposed with the same source which is the sun? A. The water has higher specific heat compared to the sa B. The sand has higher specific heat compared to the wat C. The sand is directly exposed to sun compared to the wat D. The water is directly exposed to sun compared to the sa ndererndthe sandarrow_forwardSolving Thermal Properties Related Problems There are two models which explain the effect of composition on thermal properties. Assume you know the composition of each product and, in the case of layered products, the composition of each layer. Draw a diagram of the product, specify the boundary and initial conditions, and then outline how you would estimate the products overall thermal conductivity: A cherry at field temperature (25°C) was suddenly placed in cold water at 5°C. A French fry is rapidly immersed in a deep fat fryer containing cooking oil at 400°C. A chicken breast is rapidly immersed in a deep fat fryer containing cooking oil at 450°C. An unbaked apple turnover was placed in an oven at 300°C.arrow_forward
- The following holds true for the latent heat of fusion of a material except for a. The heat of fusion is a property of the material. b. The heat of fusion describes the amount of heat per unit mass needed to change the phase of the material. c. The heat of fusion of directly proportional to the temperature. d. The heat of fusion is constant.arrow_forwardWhat is the SI unit of heat energy? A) Joule B) Newton C) Calorie D) Kelvinarrow_forward37. A cold object in contact with a hot one never spontaneously transfersenergy by heat to the hot object. Which law describes this phenomenon? a)the first law of thermodynamicsb)the second law of thermodynamicsc)the third law of thermodynamicsd)the zeroth law of thermodynamics 38. How is it possible for us to transfer energy by heat from cold objectsto hot ones? a)by increasing the specific heat of the cold bodyb)by increasing the specific heat of the hot bodyc)by doing work on the systemd)by having work done by the systemarrow_forward
- Choose the most suitable definition for "heat". Select one: a. Flow of energy in structural units of chemical substances b. Energy associated with the random motion of atoms and molecules c. Energy stored in structural units of chemical substances d. Difference between the final and initial thermal energy of a systemarrow_forwardHow does the thermos shown below keep the contents at a constant temperature? A. The thermos stores heat in the space between the walls. B. The air space between the walls prevents conduction of heat. C. The thermos reflects away heat from outside sources. D. The thermos shields the contents from radiated heat.arrow_forwardTopic: HEAT ENGINES, HEAT PUMPS & THERMAL EFFICIENCY Humans tend to gain energy from the food we eat. Explain below what is meant by “the human body is a heat engine which is more or less 20% efficient”.arrow_forward
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