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A) The coat is the source of the heat that keeps you warm.
B) Your body generates the heat that keeps you warm.
C) The coat prevents your body's heat from escaping to the surrounding air.
D) a and c
E) b and c
G) None of the above
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A change in the temperature of the sun w...View Answer
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A) visible radiation only.
B) ultraviolet radiation only.
C) infrared radiation only.
D) visible and infrared radiation only.
E) ultraviolet,visible,and infrared radiation.
G) A) and E)
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A) expansion.
B) evaporation.
C) compression.
D) condensation.
F) C) and D)
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A) the temperature at which the earth is absorbing solar radiation and emitting infrared radiation at equal rates.
B) the temperature at which the earth is radiating energy at maximum intensity.
C) the average temperature the earth must maintain to prevent the oceans from freezing solid.
D) the temperature at which rates of evaporation and condensation on the earth are in balance.
F) A) and D)
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A) put it inside a brown paper bag.
B) wrap it in black paper.
C) wrap it in aluminum foil with the shiny side facing inward.
D) wrap it in aluminum foil with the shiny side facing outward.
F) B) and C)
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A) infrared wavelengths.
B) radio wavelengths.
C) visible wavelengths.
D) ultraviolet wavelengths.
F) None of the above
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A
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In the cooling system of an automobile engine that uses water as a coolant, there are typically three different heat transport processes in operation:
1. Conduction: This is the process by which heat is transferred directly through a substance when there is a temperature difference. In the engine, heat is generated by the combustion of fuel in the cylinders. This heat is conducted through the metal of the engine block to the coolant that is in contact with the engine surfaces.
2. Convection: Once the coolant absorbs heat from the engine block via conduction, it is pumped through the cooling system. As the heated coolant moves, it carries the thermal energy away from the engine. This movement of heat via the flow of the fluid is known as convection. When the coolant reaches the radiator, it flows through thin tubes, and the heat is convected to the walls of these tubes.
3. Radiation: While not the primary mode of heat transfer in the cooling system, radiation does play a role. The radiator is designed with fins to increase its surface area, which helps to dissipate heat. As the coolant releases heat to the radiator tubes and fins, some of this heat is radiated into the surrounding air. The process of radiation involves the transfer of heat in the form of electromagnetic waves without the involvement of a physical medium.
Additionally, when the heated coolant reaches the radiator, the heat is transferred from the radiator to the air passing through it. This involves a combination of convection (as the air moves over the radiator fins and carries away the heat) and radiation (as the radiator emits heat). The cooled liquid is then recirculated back into the engine block, and the cycle repeats.
In summary, the primary heat transport processes in operation in a water-cooled automobile engine are conduction, convection, and to a lesser extent, radiation.
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Global warming is a complex phenomenon i...View Answer
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A) absorption and re-emission of visible light by the atmosphere.
B) absorption and re-emission of ultraviolet radiation by the atmosphere.
C) absorption and re-emission of infrared radiation by the atmosphere.
D) absorption and re-emission of visible light by clouds.
E) absorption and re-emission of visible light by the ground.
G) A) and B)
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A) compression.
B) expansion.
C) condensation.
D) friction.
F) A) and B)
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A rising parcel of air will not always e...View Answer
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A) enhance the atmospheric greenhouse effect.
B) weaken the atmospheric greenhouse effect.
C) are often caused by the atmospheric greenhouse effect.
D) have no effect on the atmospheric greenhouse effect.
F) A) and C)
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A) the atmosphere's average temperature would change.
B) the length of the year would change.
C) the sun's output would change.
D) the mass of the atmosphere would change.
F) B) and C)
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The Earth's energy balance is a complex ...View Answer
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A) 5 percent
B) 15 percent
C) 30 percent
D) 50 percent
E) 70 percent
G) B) and E)
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A) 7 percent of the sunlight striking the moon is reflected.
B) 7 percent of the sunlight striking the moon is absorbed.
C) the moon emits only 7 percent as much energy as it absorbs from the sun.
D) 93 percent of the sunlight striking the moon is reflected.
F) C) and D)
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A) conduction.
B) convection.
C) radiation.
D) latent heat.
F) A) and C)
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