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Questions and Answers
Determine the approximate increase in thermal energy, in joules, when the temperature of 10 g of water is raised from 15C to 45C, given that the specific heat of water is 4.19 J/gC.
Determine the approximate increase in thermal energy, in joules, when the temperature of 10 g of water is raised from 15C to 45C, given that the specific heat of water is 4.19 J/gC.
- 629
- 838
- 1257 (correct)
- 84
During a heat wave, residents wrapped metal door handles in cloth. How did this mitigate the heat?
During a heat wave, residents wrapped metal door handles in cloth. How did this mitigate the heat?
- Cloth is a conductor that conducts heat away from the door, whereas a metal door handle keeps the heat in the door.
- Cloth is a conductor, so it conducts heat less than an insulator, such as a metal door handle.
- Cloth is an insulator, so it conducts heat less than a conductor, such as a metal door handle. (correct)
- Cloth and metal are both conductors, so adding cloth increases protection from the heat.
A front door made of steel sticks when it is warm outside but not when it is cool. Which statement best explains this difference in behavior?
A front door made of steel sticks when it is warm outside but not when it is cool. Which statement best explains this difference in behavior?
- Different materials expand and contract at the same rates due to the temperature being the same.
- The metal in the door expands when it becomes warm due to an increase in temperature, and contracts when it's cooler. (correct)
- When a material contracts, it increases in volume due to a decrease in temperature.
- Thermal expansion makes the door stick when it is warmer due to a decrease in temperature.
A hot air balloon rises due to which type of heat transfer?
A hot air balloon rises due to which type of heat transfer?
What type of heat transfer enables thermal energy from the Sun to warm the Earth?
What type of heat transfer enables thermal energy from the Sun to warm the Earth?
Select the scenario that results in heat transfer.
Select the scenario that results in heat transfer.
An aluminum washer at 0C is placed in a cup of water at 22C. Despite having equal masses, the washer's temperature changes much more than the water's. Which option explains this?
An aluminum washer at 0C is placed in a cup of water at 22C. Despite having equal masses, the washer's temperature changes much more than the water's. Which option explains this?
Jose made a 200 mL cup of hot chocolate at 95C and added 50 mL of milk at 5C to cool it down. The approximate final temperature of the hot chocolate after adding the milk is:
Jose made a 200 mL cup of hot chocolate at 95C and added 50 mL of milk at 5C to cool it down. The approximate final temperature of the hot chocolate after adding the milk is:
Which list includes only renewable energy resources?
Which list includes only renewable energy resources?
A lightbulb submerged in 7.0 g of water gains 46 joules of thermal energy. If the lightbulb received a total of 81 joules from the battery, what is the lightbulb's efficiency, as a percentage?
A lightbulb submerged in 7.0 g of water gains 46 joules of thermal energy. If the lightbulb received a total of 81 joules from the battery, what is the lightbulb's efficiency, as a percentage?
Flashcards
Conduction
Conduction
The transfer of heat through direct contact. Energy is transferred from hotter objects to colder ones.
Convection
Convection
The transfer of heat through the movement of fluids (liquids or gases).
Radiation
Radiation
The transfer of heat through electromagnetic waves.
Insulator
Insulator
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Thermal Expansion
Thermal Expansion
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Thermal Energy Change
Thermal Energy Change
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Specific Heat Capacity
Specific Heat Capacity
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Renewable Energy
Renewable Energy
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Efficiency
Efficiency
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Study Notes
- The approximate increase in thermal energy when 10g of water is raised from 15°C to 45°C is 1257 joules, given water's specific heat is 4.19 J/g°C.
- During a heat wave, residents wrapped metal door handles in cloth to insulate and reduce heat conduction, as cloth is an insulator.
- Steel doors stick in warm weather due to the metal expanding with increased temperature.
- Hot air balloons rise due to convection, where hot air is less dense than the surrounding cold air.
- Radiation is the type of heat transfer that allows thermal energy from the sun to warm the Earth.
- Heat transfer occurs when mixing 20 mL of water at 23°C with 30 mL of water at 33°C, and when placing a piece of zinc at room temperature in boiling water.
- Aluminum washers at 0°C in 22°C water change temperature more than the water because aluminum has a lower specific heat.
- 200 mL of hot chocolate at 95°C with 50 mL of milk at 5°C results in an approximate final temperature of 75°C.
- Renewable energy resources include wind, solar, hydroelectric, and tidal sources.
- A lightbulb with 46 joules of thermal energy and 81 joules from the battery has an approximate efficiency of 57%.
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