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What is the role of “loose” electrons in heat conductors? “Loose” electrons move quickly and transfer energy to other electrons that migrate through the material. … Metal is very conductive, meaning it transfers heat very well. Air is a poor conductor. Does a good insulator prevent heat from escaping?, 5. Does a good insulator prevent heat from escaping, or does it simply slow its passage? A good insulator prevents heat from getting through it because of its slow passage of conduction. Furthermore, Why is Millie’s hand not burned when she holds it above the escape valve of the pressure cooker?, Why is Millie’s hand not burned when she holds it above the escape valve of the pressure cooker? Millie’s hand is not burned because the steam escaping the pressure cooker has already had a chance to expand and cool. In what form does radiant energy travel? Radiant energy travels in the form of electromagnetic waves. Finally, Why does a piece of room temperature metal feel cooler to the touch than paper wood or cloth?, Why does a piece of room–temperature metal feel cooler to the touch than paper, wood, or cloth? Feels cooler because it is an effecting conductor. … Conductor moves heat quickly, insulator moves heat slowly. Frequently Asked Question:
How are the speeds of molecules of air affected as they separate from one another when escaping from the nozzle of a party balloon? … Speeds decrease; temperature decreases.
How are the speeds of molecules of air affected when the air is compressed by the action of a tire pump? When air is compressed by a tire pump, the average speed of the air molecules inside increases. … When the air expands rapidly, the average speed of molecules is reduced.
Why does the direction of coastal winds change from day to night? It changes because the temperature of the water changes. in the day, the warm air in the land rises and needs the cooler air from the water to replace it. Whereas at night, the water is warmer and needs cooler air from the land.
Why wouldn’t you expect all of the molecules in a gas to have the same speed? Gas molecules move haphazardly and at random speeds. … In this continuous interaction, it would be statistically impossible for any larger number of molecules to have the same speed.
Why is Millie’s hand not burned when she holds it above the escape valve of the pressure cooker? Millie’s hand is not burned because the steam escaping the pressure cooker has already had a chance to expand and cool. In what form does radiant energy travel? Radiant energy travels in the form of electromagnetic waves.
The black pot will normally warm faster because dark objects absorb and emit radiant energy well. Why does the pupil of the eye appear black? An object radiating energy at night is in contact with the relatively warm Earth.
Why are materials such as wood, fur, feathers, and even snow good insulators? Because the outer electrons in the atoms of these insulators are firmly attached. … A good insulator slows heat’s passage.
A hot object contains nternal energy, not heat. Object contains translational KE of jostling molecules, rotational KE and other KE and PE from molecular forces. How is heat similar to and different from internal energy? They are both forms of energy, but heat flows, whereas internal energy does not.
What determines whether an object is a net absorber or a net emitter of radiant energy at a given time? It is determined by the temperature of the object relative to its surroundings. Hotter objects are net emitters.
n. 1 a person or thing that emits. 2 a radioactive substance that emits radiation.
An object can never be both good absorber and a good reflector at the same time. A good absorber absorbs the radiation while a good reflector reflects the heat. … If an object radiates energy without absorbing the same amount in return, its temperature falls and the object feels colder. 23.
What determines the direction of heat flow? Heat energy is the energy which transfers from hot object to cold object. So the direction of heat flow only depends on the temperature change. Therefore, the temperature determines the direction of heat flow.
Why are materials such as wood, fur, feathers, and even snow good insulators? Because the outer electrons in the atoms of these insulators are firmly attached. … A good insulator slows heat’s passage.
We would not expect all the molecules in a gas to have the same speed, because there is a transition of speed through the kinetic energy due to the internal movements of atoms within the molecules.
What does this tell you about the relative conductivities of metal and air? Metal is a good conductor of heat, whereas air is a terrible conductor of heat. Explain why a firewalker can step quickly without harm on red-hot coals with bare feet. Wood, even as glowing coals, is a poor conductor of heat.
This happens because different objects have different specific heats (caloric capacities) Even if the objects have the same mass, objects are made off different substances and this implies they have different specific heats. The same amount of heat added will give different temperature differences on different objects.
Hence, temperature at the bottom of the Niagara Falls is lower than the temperature at the top of the falls. (Visited 13 times, 1 visits today) |