Which of the following is an example of the transfer of heat through radiation?
1 point
a pot of water boiling on the stove
a spoon turning hot after sitting a cup of hot tea
feeling the heat on your skin from the sun's rays
feeling the heat on your skin from the sun's rays
Which of the following is the correct energy transformation of a flashlight?
1 point
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electrical to thermal to chemical
light to electrical to chemical
chemical to electrical to light
light to electrical to chemical
Describe the three labeled methods of heat transfer in order. For example, A is ____. Identify and describe one example of heat transfer at your house.
1 point
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A) Conduction: Conduction is the transfer of heat energy through direct contact between two objects or substances. It occurs when heat transfers from a warmer object to a cooler object by the direct collision and transfer of kinetic energy between particles.
Example at home: When you place a metal spoon in a hot cup of soup, the heat from the soup is conducted through the spoon handle, making it hot to touch.
B) Convection: Convection is the transfer of heat by the movement of fluids (liquids or gases). It occurs when the hotter particles rise and the cooler particles sink, creating a continuous circulation of heat energy.
Example at home: When you turn on your home's heating system, the warm air rises, creating convection currents that distribute the heated air throughout the room.
C) Radiation: Radiation is the transfer of heat energy through electromagnetic waves. It does not require a medium and can occur even in a vacuum. The heat is emitted as electromagnetic waves and travels through space until it is absorbed by another object.
Example at home: Feeling the warmth of sunlight on your skin is an example of heat transfer through radiation. The sun's rays emit electromagnetic waves, which carry heat energy and warm up your skin when they come into contact with it.
How does thermal energy move?
1 point
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from hotter to cooler until all the substances attain the same temperature
from cooler to hotter until all the substances attain the same temperature
from hotter to warmer until all the substances attain the same temperature
Thermal energy moves from hotter to cooler until all the substances attain the same temperature.
Which of the following describes kinetic energy?
1 point
stored energy
energy of motion
energy of reaction