Physical Science
11th Edition
ISBN: 9780077862626
Author: Bill Tillery, Stephanie J. Slater, Timothy F. Slater
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 4, Problem 6QFT
Why is air a good insulator?
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What is the role of “loose” electrons in heat conductors?
(A) Loose electrons move quickly away from hot locations, making it impossible for energy to move and making the object a good insulator.
(B) Loose electrons absorb energy, giving materials a high specific heat capacity.
(C) Loose electrons vibrate and emit radiation that carries energy through the material at the speed of light.
(D) Loose electrons transfer energy rapidly through a solid.
Question 1
(a) State Coulomb's Law. What is unit of electric charge?
(b) When a 390 g piece of iron at 200°C is placed in a 85
g copper calorimeter cup containing 230 g of glycerine
at 15°C, the final temperature is observed to be 40°C.
Estimate the specific heat of glycerine.( specific heat of
iron 450 J/kg°C, Specific heat of copper 385 J/kg°C)
After exercising, your body gets hot. If you want to cool down, should your exercise clothes be
made of a higher material or a lower conductivity?
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Chapter 4 Solutions
Physical Science
Ch. 4 - 1. The Fahrenheit thermometer scale is
a. more...Ch. 4 - Prob. 2ACCh. 4 - Prob. 3ACCh. 4 - 4. External energy refers to the
a. energy that...Ch. 4 - Prob. 5ACCh. 4 - The specific heat of copper is 0.093 cal/gC, and...Ch. 4 - 7. The specific heat of water is 1.00 cal/gC°, and...Ch. 4 - Prob. 8ACCh. 4 - Prob. 9ACCh. 4 - Prob. 10AC
Ch. 4 - Prob. 11ACCh. 4 - Prob. 12ACCh. 4 - 13. The energy supplied to a system in the form of...Ch. 4 - Prob. 14ACCh. 4 - Prob. 15ACCh. 4 - Prob. 16ACCh. 4 - Prob. 17ACCh. 4 - Prob. 18ACCh. 4 - Prob. 19ACCh. 4 - Prob. 20ACCh. 4 - 21. The transfer of heat that takes place because...Ch. 4 - 22. Latent heat is “hidden” because it
a. goes...Ch. 4 - Prob. 23ACCh. 4 - 24. A heat engine is designed to
a. move heat from...Ch. 4 - 25. The work that a heat engine is able to...Ch. 4 - Prob. 26ACCh. 4 - Prob. 27ACCh. 4 - Prob. 28ACCh. 4 - 29. The cheese on a hot pizza takes a long time to...Ch. 4 - 30. The specific heat of copper is roughly three...Ch. 4 - Prob. 31ACCh. 4 - 32. Conduction best takes place in a
a. solid.
b....Ch. 4 - 33. Convection best takes place in a (an)
a....Ch. 4 - Prob. 34ACCh. 4 - Prob. 35ACCh. 4 - Prob. 36ACCh. 4 - Prob. 37ACCh. 4 - 38. At temperatures above freezing, the...Ch. 4 - Prob. 39ACCh. 4 - Prob. 40ACCh. 4 - Prob. 41ACCh. 4 - 42. The second law of thermodynamics tells us that...Ch. 4 - 43. The heat death of the universe in the future...Ch. 4 - 1. What is temperature? What is heat?
Ch. 4 - 2. Explain why most materials become less dense as...Ch. 4 - 3. Would the tight packing of more insulation,...Ch. 4 - 4. A true vacuum bottle has a double-walled,...Ch. 4 - 5. Why is cooler air found in low valleys on calm...Ch. 4 - 6. Why is air a good insulator?
Ch. 4 - 7. Explain the meaning of the mechanical...Ch. 4 - 8. What do people really mean when they say that a...Ch. 4 - 9. A piece of metal feels cooler than a piece of...Ch. 4 - 10. Explain how the latent heat of fusion and the...Ch. 4 - 11. What is condensation? Explain, on a molecular...Ch. 4 - 12. Which provides more cooling for a Styrofoam...Ch. 4 - 13. Explain why a glass filled with a cold...Ch. 4 - 14. Explain why a burn from 100°C steam is more...Ch. 4 - Briefly describe, using sketches as needed, how a...Ch. 4 - 16. Which has the greatest entropy: ice, liquid...Ch. 4 - 17. Suppose you use a heat engine to do the work...Ch. 4 - 1. Considering the criteria for determining if...Ch. 4 - Prob. 2FFACh. 4 - 3. Gas and plasma are phases of matter, yet gas...Ch. 4 - Prob. 4FFACh. 4 - 5. This chapter contains information about three...Ch. 4 - Prob. 6FFACh. 4 - 7. Explore the assumptions on which the “heat...Ch. 4 - Prob. 1IICh. 4 - Prob. 1PEBCh. 4 - Prob. 2PEBCh. 4 - Prob. 3PEBCh. 4 - 4. A 1.0 kg metal head of a geology hammer strikes...Ch. 4 - 5. A 60.0 kg person will need to climb a 10.0 m...Ch. 4 - 6. A 50.0 g silver spoon at 20.0°C is placed in a...Ch. 4 - 7. If the silver spoon placed in the coffee in...Ch. 4 - 8. How many minutes would be required for a 300.0...Ch. 4 - Prob. 9PEBCh. 4 - 10. A 1.00 kg block of ice at 0°C is added to a...Ch. 4 - Prob. 11PEBCh. 4 - Prob. 12PEBCh. 4 - Prob. 13PEBCh. 4 - 14. A heat engine converts 100.0 cal from a supply...Ch. 4 - Prob. 15PEB
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- Why is a person able to remove a piece of dry aluminum foil from a hot oven with bare fingers, whereas a burn results if there is moisture on the foil?arrow_forwardSome electric sieves have a flat ceramic surface with heating elements hidden beneath. A pot placed over a heating element will be heated, while it is safe to touch the surface only a few centimeters away. Why is ceramic, with a conductivity less than that of a metal but greater than that of a good insulator, an ideal choice for the stove top?arrow_forwardA common material for cushioning objects in packages is made by trapping bubbles of air between sheets of plastic. Is this material more effective at keeping the contents of the package from moving around inside the package on (a) a hot day, (b) a cold day, or (c) either hot or cold days?arrow_forward
- if you are wearing clothes to prevent heat from escaping your body in the winter, how do you explain wearing more clothes in the summer so that you prevent heat from entering your body?arrow_forwardSuppose a walrus transfers energy by conduction through its blubber at the rate of 165 W when immersed in -0.95°C water. The walrus’s internal core temperature is 37.0°C, and it has a surface area of 2.1 m2 What is the average thicness of its blubber, in centimeters, which has the conductivity of fatty tissue?arrow_forwardWhat thickness of (a) concrete, (b) brick wood have the same insulating ability as 10 cm of glass wool (k for glass wool, concrete and brick is 0.4, 0.8 and 0.6 W/m°C, respectively.)arrow_forward
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- A 22°C day is warm, while a swimming pool at 22°C feelscool. Why?arrow_forwardHava boşluğunda yarıçapı r=9 cm olan iki iletken küre x=-0.8 m ve x=0.8 m noktasına konmuştur. Küreler arasında oluşan kapasitansı bulunuz. Two conductive spheres with a radius of r=9 cm in the air gap are placed at the point x=-0.8 m and the point x=0.8 m. Find the capacitance that occurs between the globes m=3,1416 y Xarrow_forwardA pond in winter has a layer of ice 5cm thick. The temperature of the air above the ice is -10C and the temperature of the water directly below the ice is 0C. (i) Find out how much heat passes by conduction through a square meter of ice each second (thermal conductivity of ice = k_ice = 2.2 W/m C) (ii) How would the amount of heat transfer differ if the ice were 7.5 cm thick instead of 5 cm thick? (how many times as much or as less)arrow_forward
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