Review: Suppose we have a 200-gram block of aluminum initially at 25°C. If we supply 5000 joules of heat energy to the block, what will be its final temperature? The specific heat capacity of aluminum is 0.9 J/g∘C. use
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Reach chapter 15, what questions do you have?
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A piece of plastic and a piece of metal are both outside on a freezing (0℃) day. They are the same temperature. Why will they feel like they are different temperatures when you touch them?
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As a given mass of air rises, why does it cool down?
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Why does the hot water warmed by the hot cup below the tank have to rise?
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Since all objects are absorbing energy from their surroundings, why don't the temperatures of all objects continually increase?
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If I pour a hot cup of water into a bucket of cold water, they will eventually reach "thermal equilibrium". Define "thermal equilibrium".
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Even if the air isn't quite freezing, frost can form on a plant at night, but will not form on a rock nearby. Why?
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What is the function of the silver surface of a thermos bottle?
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Which property represents the amount of heat required to raise the temperature of a substance?
Heat transfer
Thermal conductivity
Specific heat
Heat capacity
If two substances have the same mass and are heated with the same amount of heat, the substance with the lower specific heat will...
Undergo a phase change
Undergo a smaller temperature change
Undergo no change
Undergo a greater temperature change
When an object is heated, it generally expands due to...
Increased molecular motion
Decreased density
Decreased temperature
Increased gravity
The expansion of a substance caused by heating is known as...
Phase change
Heat transfer
Temperature increase
Thermal expansion
Why can you comfortably hold your fingers closely beside an open candle flame, but not comfortably closely above a candle flame?
The side of the flame has lower temperature.
Heat is conducted more efficiently through the air on the side.
The flame's radiation produces a cooling effect on its surroundings.
Hot air rises, creating a convection current.
What is the role of "loose" electrons in heat conductors?
Loose electrons absorb heat and prevent conduction.
Loose electrons facilitate heat conduction by colliding with neighboring atoms.
Loose electrons generate a cooling effect, slowing down heat conduction.
Loose electrons trap heat, causing insulation against conduction.
Why does the direction of coastal winds change from day to night?
The land heats slower than the water at day and cools slower at night, so the heat differential changes from moving from hot to cold towards the land during the day to moving away from the land at night.
The land heats faster than the water at day and cools faster at night, so the heat differential changes from moving from hot to cold away the land during the day to moving towards from the land at night.
The land heats slower than the water at day and cools slower at night, so the heat differential changes from moving from cold to hot towards the sea during the day to moving away from the sea at night.
The land heats faster than the water at day and cools faster at night, so the heat differential changes from moving from cold to hot towards the land during the day to moving away from the land at night.
How do the wavelengths of radiant energy vary with the temperature of the radiating source
The wavelength decreases as the temperature increases
The wavelength increases as the temperature increases.
The wavelength remains constant regardless of the temperature.
The wavelength is inversely proportional to the temperature.
Two objects can have different amounts of heat, but be at thermal equilibrium
True
False
Which will undergo a greater rate of cooling, a red hot poker in a warm oven, or a red-hot poker in a cold room?
warm oven
cold room
the rate of cooling is the same in each
Categorize each of these as the major type of heat transfer it represents.
solar panels
frying vegetables in a pan
x-ray imaging
A hair dryer drying hair
Blowing on a hot beverage
microwaving food
Ironing clothes
Walking barefoot on a hot sidewalk
an incandescent bulb
Chimney draft
A lizard warming its belly on a hot rock.
Ocean currents
sun burn
Conduction
Convection
Radiation
Which of the following is a poor insulator?
Metal
Glass
Rubber
Wood
Which mode of heat transfer involves the transfer of heat through direct contact?
Conduction
Convection
Radiation
Insulation
Which mode of heat transfer occurs when heated particles rise and cooler particles sink?
Evaporation
Convection
Radiation
Conduction
Which mode of heat transfer does not require a medium?
Condensation
Conduction
Convection
Radiation
Categorize the concepts here based on your understanding.
thermal conductivity
how heat is transferred through a solid
how heat is transferred through fluids
what is heat transfer via radiation?
relationship between the difference in temperature and the rate of heat transfer