All Matches

Solution Library

Expert Answer

Textbooks

Search Textbook questions, tutors and Books

Oops, something went wrong!

Change your search query and then try again

Result Not Found

Books FREE
Tutors
Study Help
Hire a Tutor
AI Study Help New

Search
Sign In
Register

study help
physics
college physics a strategic approach 2nd

Questions and Answers of College Physics A Strategic Approach 2nd

6. When an ideal gas expands adiabatically, (a) work is done by it, (b) its thermal energy does not change,(c) its temperature increases.
5. When heat is added to an ideal gas during an isothermal expansion, (a) work is done by the ideal gas, (b) the ideal gas’s thermal energy increases, (c) its thermal energy decreases.
4. According to the first law of thermodynamics, if compressional work is done on an ideal gas, then(a) its thermal energy must change, (b) heat must be transferred from it, (c) its thermal energy
3. If the work done by a system is equal to zero, the process must be (a) isothermal, (b) adiabatic, (c) isobaric,(d) isometric.
2. There is no heat flow into or out of the system in an (a) isothermal process, (b) adiabatic process,(c) isobaric process, (d) isometric process.
1. During an isobaric expansion of an ideal gas, which of these do not change: the gas’s (a) thermal energy,(b) temperature, (c) volume, (d) pressure.
57. ••• A steel cylinder of radius 5.0 cm and length 4.0 cm is placed in end-to-end thermal contact with a copper cylinder of the same dimensions. The free ends of the two cylinders are
55. •• An object with a surface temperature of 100 °C is radiating heat at a rate of 200 J/s. To double the object’s rate of radiation energy, what should be its surface temperature, expressed
54. IE •• (a) If the Kelvin temperature of an object is doubled, its emitted radiation rate increases by (1) 2, (2)4, (3) 8, (4) 16 times. Explain. (b) If its temperature is increased from 20 °C
53. •• A lamp filament has a net radiation rate of 100 W when the temperature of the surroundings is 20 °C, and only 99.5 W when the surroundings are at 30 °C.If the temperature of the filament
52. IE •• The emissivity of an object is 0.50. (a) Compared with a blackbody at the same temperature, this object would radiate (1) more power, (2) the same amount of power, (3) less power. Why?
51. •• Assuming the human body has a 1.0-cm-thick layer of skin tissue and a surface area of 1.5 m2, estimate the rate at which internal energy is conducted from inside the body to the surface if
50. •• A copper teakettle has a circular bottom 30.0 cm in diameter that has a uniform thickness of 2.50 mm. It sits on an electric burner whose temperature is 150 °C.(a) If the kettle contains
49. IE •• An aluminum bar and a copper bar of identical cross-sectional area have the same temperature difference between their ends and conduct heat at the same rate. (a) The copper bar is (1)
48. • The United States five-cent coin, the nickel, has a mass of 5.1 g, a volume of 0.719 cm3, and a total surface area of 8.54 cm2. Treating the coin as an ideal radiator, how much radiant energy
47. • Assume your skin has an emissivity of 0.90, a temperature of 34 °C, and an exposed area of 0.25 m2.What is the net energy lost per second due to radiation if the outside temperature is 22
46. • Assume a goose has a 2.0-cm-thick layer of feather down (on average) and a body surface area of 0.15 m2.What is the rate of heat loss by conduction if the goose, with a body temperature of 41
45. IE • A house designer can choose between a brick wall or a concrete wall with the same thickness. (a) During a cold winter day, compared with a concrete wall, a brick wall will conduct energy
44. IE • Assume that a tile floor and an oak floor are at the same temperature and are equally thick. Both are cemented to the same subfloor (i.e., their undersides are at the same temperature
43. • The single glass pane in a window has dimensions of 2.00 m by 1.50 m and is 4.00 mm thick. How much heat will flow through the glass in 1.00 h if there is a temperature difference of 2.00 °C
42. ••• In an experiment, a 0.150-kg piece of a ceramic material at 20 °C is placed in liquid nitrogen at its boiling point to cool in a perfectly insulated flask, which allows the gaseous N2
40. IE ••• A 0.400-kg piece of ice at −10 °C is placed into an equal mass of water at 30 °C. (a) When thermal equilibrium is reached between the two, (1) all the ice will melt, (2) some of
39. IE •• Evaporation of water from our skin is an important mechanism for controlling body temperature.(a) This is because (1) water has a high specific heat,(2) water has a high heat of
38. •• Steam at 100 °C is bubbled into 0.250 kg of water at 20 °C in a calorimeter cup, where it condenses into liquid form. How much steam will have been added when the water in the cup
37. •• To cool a hot piece of 4.00-kg steel at 900 °C, it is put into a 5.00-kg water bath at 20 °C. What is the final temperature of the steel-water mixture?
36. •• Ice (initially at 0 °C) is added to 0.75 L of tea at 20 °C to make the coldest possible iced tea. If enough ice is added so the final result is all liquid, how much liquid is in the
35. •• How much ice (at 0 °C) must be added to 0.500 kg of water at 100 °C in a 0.200-kg aluminum calorimeter cup to end up with all liquid at 20 °C?
34. •• If 0.050 kg of ice at 0 °C is added to 0.300 kg of water at 25 °C in a 0.100-kg aluminum calorimeter cup, what is the final temperature of the water?
33. IE •• Internal energy must be removed to condense mercury vapor at 630 K into liquid mercury at that temperature. (a) This heat transfer involves (1) only specific heat, (2) only latent heat,
32. IE •• An alcohol rub can rapidly decrease body (skin)temperature. (a) This is because of (1) the cooler temperature of the alcohol, (2) the evaporation of alcohol,(3) the high specific heat
31. • How much heat is required to completely boil away 0.50 L of liquid nitrogen at −196 °C? (The density of liquid nitrogen is 8.0 × 102 kg/m3.)
30. • First calculate the heat that needs to be removed to convert 1.0 kg of steam at 100 °C to water at 40 °C and then compute the heat that needs to be removed to lower the temperature of water
29. • An artist wants to melt some lead to make a statue.How much heat must be added to 0.75 kg of lead at 20 °C to cause it to melt completely?
28. • Water is boiled to add moisture to the air in a room to help a congested person breathe better. Find the heat required to boil away 1.0 L of water initially at 50 °C.
27. IE • (a) Converting 1.0 kg of water at 100 °C to steam at 100 °C requires (1) more heat, (2) the same amount of heat, (3) less heat than converting 1.0 kg of ice at 0 °C to water at 0 °C.
26. • How much heat is required to boil away 1.50 kg of water initially at 100 °C?
25. • How much heat is required to melt a 2.5-kg block of ice at 0 °C?
24. ••• A room full of people tends to be warmer than when that room is empty. Suppose that ten people are in a 4.0 m × 6.0 m × 3.0 m room initially at 20 °C. If each gives off heat at a
23. ••• A student mixes 1.0 L of water at 40 °C with 1.0 L of ethyl alcohol at 20 °C. Assuming no heat exchanges with the container and surroundings, what is the final temperature of the
22. ••• Lead pellets of total mass 0.60 kg are heated to 100 °C and then placed in a well-insulated aluminum cup of mass 0.20 kg that contains 0.50 kg of water initially at 17.3 °C. What is
21. IE •• In a calorimetry experiment, 0.50 kg of a metal at 100 °C is added to 0.50 kg of water at 20 °C in an aluminum calorimeter cup. The cup has a mass of 0.250 kg.(a) If some water
20. •• To determine the specific heat of a new metal alloy, a 0.150 kg piece of it is heated to 400 °C and then placed in a 0.200 kg aluminum calorimeter cup containing 0.400 kg of water at 10.0
19. •• While resting, a person gives off heat at a rate of about 100 W. If the person is submerged in a tub containing 150 kg of water at 27 °C and assuming that all the heat from the person
18. •• At what average rate would heat have to be removed from 1.5 L of (a) water and (b) mercury to reduce each liquid’s temperature from 20 °C to its freezing point in 3.0 min?
17. •• A student doing an experiment pours 0.150 kg of heated copper shot into a 0.375-kg aluminum calorimeter cup containing 0.200 kg of water. The cup and water are both initially at 25 °C.
16. •• An aluminum spoon at 100 °C is placed in a Styrofoam cup containing 0.200 kg of water at 20 °C.If the final equilibrium temperature is 30 °C and no heat is lost to the cup or the
15. •• A 0.250-kg coffee cup at 20 °C is filled with 0.250 kg of brewed coffee at 100 °C. The cup and the coffee come to thermal equilibrium at 80 °C. If no heat is lost to the environment,
14. •• A 0.20-kg glass cup at 20 °C is filled with 0.40 kg of hot water at 90 °C. Neglecting any heat losses to the environment, what is the equilibrium temperature of the water?
13. IE •• Initially at 20 °C, 0.50 kg of aluminum and 0.50 kg of iron are heated to 100 °C. (a) The aluminum gains (1) more heat than the iron, (2) the same amount of heat as the iron, (3) less
12. IE •• Equal amounts of heat are added to different masses of copper and lead. The copper’s temperature increases by 5.0 °C and the lead’s by 10 °C. (a) The lead has (1) a greater mass
11. •• An engine of alloy construction consists of 25 kg of aluminum and 80 kg of iron. How much heat does the engine absorb as its temperature increases from 20 °C to 100 °C?
10. IE •• Equal amounts of heat are added to an aluminum block and a copper block of different masses to achieve the same temperature increase. (a) The mass of the aluminum block is (1) more, (2)
9. • Blood can carry excess internal energy from the interior to the surface of the body, where it is transferred to the outside environment. If 0.250 kg of blood at a temperature of 37.0 °C flows
8. • A 5.00-g pellet of aluminum reaches a final temperature of 63 °C when gaining 200 J of heat. What was its initial temperature?
7. IE • The temperatures of a lead block and a copper block, both with a mass of 1.0 kg and at 20 °C, are to be raised to 100 °C. (a) The copper will require(1) more heat, (2) the same heat, (3)
6. • It takes 2.0 × 106 J of heat to bring a pot of water from 20 °C to a boil. What is the water’s mass?
5. •• A student ate a Thanksgiving dinner that totaled 2800 Cal. He wants to use up all that energy by lifting a 20-kg mass a distance of 1.0 m. Assume that no work is required in lowering the
4. •• A typical adult metabolic rate (the rate at which the body “burns” – that is, converts – [chemical] food energy into thermal energy) is about 4 × 105 J/h, and the average food
3. • During a game, a typical NBA basketball player will do about 1.0 × 106 J of work in one hour. Express this in Calories.
2. • A person goes on a 1500-Cal/day diet to lose weight.What is his daily energy allowance expressed in joules?
1. • A window air conditioner has a rating of 20 000 Btu/h. What is this expressed in watts?
17. Explain in your own words how the Thermos bottle(Figure 11.14) uses all the mechanisms of heat transfer to keep coffee hot and also keep a cold drink cold.
16. Polar bears have an excellent heat insulation system.(Sometimes even infrared cameras cannot detect them.) Polar bear hairs are actually hollow inside.Explain how this helps the bears maintain
15. The approaches to bridges in cold climates are typically preceded by warning signs indicating that the road surface on the bridge can ice up before the road surface approaching the bridge.
14. A plastic ice cube tray and a metal ice cube tray are removed from the same freezer, at the same initial temperature. However, the metal one feels cooler to the touch. Why?
13. When you breathe out in the winter, it is said you can see your breath. Explain.
12. In general, you would get a more severe burn from coming into contact with a given mass of steam at 100 °C than from the same mass of hot water at 100 °C.Why?
11. Discuss the energy conversion in the process of adding heat to an object that is undergoing a phase change.
10. You are monitoring the temperature of cold ice cubes(−5.0 °C) in a cup as the ice and cup are heated.Initially, the temperature rises, but it stops at 0 °C.After a while, it begins rising
9. A hot steel ball is dropped into a cold aluminum cup containing some water. (Assume the system is isolated.)If the ball loses 400 J of heat, what can be said about the amount of heat gained by the
8. Many people have performed fire walking, in which a bed of red-hot coals is walked on with bare feet.(You should not try this at home!) How is this possible? [Hint: Human tissues largely consist
7. Equal amounts of heat are added to two different objects at the same initial temperature. What factor(s)can cause the final temperature of the two objects to be different?
6. At a lake, does a kilogram of lake water or a kilogram of lake beach sand experience a larger temperature rise during a hot summer day? Which experiences a bigger temperature drop a cold winter
5. Is it possible for internal energy to be transferred from a cold object to a hotter one? Explain.
4. It is possible to increase a gas’s temperature by rapidly compressing it (doing work on it). Observing you doing this, a friend says that you “heated up” the gas. Evaluate this statement for
3. If someone says that a hot object contains more heat than a cold one, how would you answer? Why?
2. Discuss the difference between the concepts of internal energy and heat.
1. Why would the Btu not be a good unit to use on the Moon? [Hint: Look at its definition and gravity.]
9. Heat of transformation is always (a) part of the specific heat, (b) related to the specific heat, (c) the same as the mechanical equivalent of heat, (d) none of the preceding.
8. The units of heat of transformation are (a) 1/°C,(b) J/(kg·°C), (c) J/°C, (d) J/kg.
7. For gases, how does their specific heat at constant pressure, cp, compare to that at constant volume, cv?(a) cp > cv, (b) cp = cv, (c) cp < cv, or (d) none of the preceding.
6. The fundamental physical principle used in the method of calorimetry is (a) Newton’s second law,(b) conservation of momentum, (c) conservation of energy, (d) equilibrium.
5. The same amount of heat is added to two objects of the same mass. If object 1 experienced a greater temperature change than object 2, then how do their specific heats compare? (a) c1 > c2, (b) c2
4. The amount of heat necessary to change the temperature of 1 kg of a substance by 1 °C is called its (a) specific heat, (b) heat of combustion, (c) mechanical equivalent of heat.
3. The mechanical equivalent of heat is (a) 1 kcal = 4.186 J,(b) 1 J = 4.186 cal, (c) 1 cal = 4.186 J, (d) 1 Cal = 4.186 J.
2. Which of the following is the largest unit of heat energy: (a) 1 calorie, (b) 1 Btu, (c) 1 J, or (d) 1 kJ?
1. The SI unit of heat energy is the (a) calorie, (b) kilocalorie,(c) Btu, (d) joule.
63. •• A diatomic gas sample has a certain thermal energy at 25 °C. If a monatomic gas sample with the same number of molecules is to have the same thermal energy, what is the Celsius
62. •• For an average molecule of nitrogen at 10 °C, what are its (a) translational kinetic energy, (b) rotational kinetic energy, and (c) total energy? Repeat for helium gas at the same
61. • If 1.0 mol of a monatomic gas has a thermal energy of 5.0 × 103 J at a certain temperature, what is the thermal energy of 1.0 mol of a diatomic gas at the same temperature?
60. • At 30 °C what are the thermal energies of 1.00 mol of helium and 1 mol of oxygen gas?
59. IE ••• During the race to develop the atomic bomb in World War II, it was necessary to separate the lighter“fissionable” isotope of uranium (U-235) from the more massive
58. •• If the rms speed of the molecules in an ideal gas at 20 °C increases by a factor of 2, what is the new Celsius temperature?
57. •• If the temperature of an ideal gas is raised from 25 °C to 100 °C, how much faster is the new rms speed of the gas molecules?
56. •• If the temperature of an ideal gas increases from 300 to 600 K, what happens to the rms speed of the gas molecules?
55. •• If 2.0 mol of oxygen is confined in a 10-L bottle under a pressure of 6.0 atm, what is the average kinetic energy of an oxygen molecule?
54. IE •• A sample of oxygen and another sample of nitrogen are at the same temperature. (a) The rms speed of the nitrogen sample is (1) greater than, (2) the same as, or (3) less than the rms
53. •• A quantity of an ideal gas is at 0 °C. An equal quantity of another ideal gas is at twice the absolute temperature.What is its Celsius temperature?
52. •• (a) Estimate the total translational kinetic energy in a classroom at normal room temperature.Assume the room measures 4.00 m by 10.0 m by 3.00 m. (b) If this energy were all harnessed,
51. • (a) What is the average kinetic energy per molecule of a monatomic gas sample at 25 °C? (b) What is the rms speed of the molecules if the gas is helium?

Showing 1700 - 1800 of 3513

First
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Last

Services

Sitemap
Fun
Definitions
Become Tutor
Study Help Categories
Recent Questions
Expert Questions

Company Info

Security
Copyrights
Privacy Policy
Terms & Conditions
SolutionInn Fee
Scholarship

Get In Touch

About Us
Contact Us
Career
Jobs
FAQ
Campus Ambassador

Secure Payment

Download Our App

© 2024 SolutionInn. All Rights Reserved