physics s3w2 heat transfer - Gwyneth Lenfest | Laabri

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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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Which property represents the amount of heat required to raise the temperature of a substance?

Heat transfer

Thermal conductivity

Specific heat

Heat capacity

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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

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When an object is heated, it generally expands due to...

Increased molecular motion

Decreased density

Decreased temperature

Increased gravity

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The expansion of a substance caused by heating is known as...

Phase change

Heat transfer

Temperature increase

Thermal expansion

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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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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.

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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.

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As a given mass of air rises, why does it cool down?

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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.

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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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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.

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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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Two objects can have different amounts of heat, but be at thermal equilibrium

Nokorɛ

Ɛnyɛ ampa

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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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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

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Categorize each of these as the major type of heat transfer it represents.

A hair dryer drying hair
an incandescent bulb
microwaving food
Blowing on a hot beverage
Ocean currents
Chimney draft
sun burn
A lizard warming its belly on a hot rock.
solar panels
frying vegetables in a pan
Ironing clothes
x-ray imaging
Walking barefoot on a hot sidewalk

Conduction
Convection
Radiation

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Which of the following is a poor insulator?

Metal

Glass

Rubber

Wood

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Which mode of heat transfer involves the transfer of heat through direct contact?

Conduction

Convection

Radiation

Insulation

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Which mode of heat transfer occurs when heated particles rise and cooler particles sink?

Evaporation

Convection

Radiation

Conduction

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Which mode of heat transfer does not require a medium?

Condensation

Conduction

Convection

Radiation

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What is the function of the silver surface of a thermos bottle?

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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
how heat drives air/water currents
thermal equilibrium
electromagnetic waves in heat transfer.
newton's law of cooling

I got this
I'm shaky
So confused