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Sunlight passes through the windows of a car and causes the car seats to get hot. Which type of energy flow is involved in heating the seats?
A pan containing hot water is left on the counter and becomes cool mainly due to
water molecules moving apart.
cold air penetrating the hot water.
heat from the water moving into the cooler air.
hot water reacting with the metal pan.
The picture shows a blacksmith lowering red-hot metal into a barrel of water. When the metal is dipped in the water, the water boils. What causes the water to boil?
The water is displaced by the hot metal.
Heat from the metal is transferred to the water.
The boiling point of the water is reduced by the metal.
Gases given off by the metal bubble to the surface of the water.
In an investigation, water in an Erlenmeyer flask is placed on a hot plate. As the water is heated, the cooler, denser water at the surface sinks and pushes the watermen water to the top. What do the arrows in the drawing MOST likely represent?
energy transfer by conduction
What is an insulator?
a device that keeps too much current from flowing through wires.
a switch that protects circuits from currents that are too high.
a material through which current cannot move easily.
a loop of wire that generates an alternating current.
Down feathers are used by many sleeping bag manufacturers because down feathers are
At what temperature does water begin to boil?
Jonathan places a pot of water on a stove. As the water boils, how does the state of the water change?
from gas to liquid.
from liquid to gas.
from liquid to solid.
from solid to liquid
When ice melts, it becomes a
When water changes from a liquid to a gas and then the steam condenses back to the liquid
form, these types of changes are
Specific heat is defined as the amount of energy needed to raise the temperature of 1 gram of a substance by 1ºC. If the mass of each substance were equal, which substance would heat the fastest?
One unique characteristic of water is that its specific heat
can only be measured in calories
is lower than other common substances
is higher than other common substances
requires little energy for a big temperature change
A student placed four 10.0 gram blocks of metal on a sunny window sill. Which metal took the MOST time to increase in temperature by 10ºC?
What is the term for the amount of heat per unit mass required to raise the temperature of a material by one degree Celsius?
specific heat capacity
A pan of soup is being heated on an electric stove. A metal spoon is used to occasionally stirthe soup. Which of the following is an example of heat being transferred by convection?
heating the pan
heating the soup
heating the spoon
heating the stove burner
One end of a metal rod is placed over a flame during an investigation. A thermometer is touching the opposite end of the metal rod. Which BEST describes what is happening during this investigation?
Convection carries heat to the thermometer.
Radiant energy warms the thermometer.
Mechanical energy from the flame carries heat to the thermometer.
Heat from the flame is conducted through the metal rod to the thermometer.
Use the diagram of a convection current to answer the question that follows. Which arrow represents the hottest air in this convection current?
Why is covering up wit a thick, fluffy blanket a good way to stay warm on a cold night?
The blanket produces heat that warms your body.
The blanket transfers thermal energy from the room to your body.
The blanket decrease the transfer of thermal energy from your body to the air.
The blanket increase the amount of thermal energy that your body produces.
Which of the following heat exchange processes involves the collision of particles?
When a black brick is placed in direct sunlight, its temperature rises. The rise in temperature BEST demonstrates which of the following?
The weight of the brick increases over time.
The Sun exerts a magnetic force on the brick.
Energy from the Sun is transferred by waves to the brick.
Mass from the Sun is transferred to the brick as heat.
Which statement describes the transfer of energy when an ice cube is placed in a cup of hot tea?
Heat flows form the tea to the ice.
Cold flows from the ice to the tea.
Cold flows from the ice, and heat flows from the tea.
Heat flows simultaneously between the ice and the tea.
Energy from the Sun reaches Earth by
An electric hotplate is used to cook food in an all-metal frying pan. Which BEST shows the path of conduction of thermal energy?
Pan --> Coil
A hot rock is dropped into a pail of cool water. Heat energy transferred from the rock to the water by
The transfer of thermal energy from one object to another is known as
A student standing near a campfire feels warmer as the fire grows. Which process MOST likely transfers heat from the campfire to the student?
How is energy transferred when an instance cold pack is put on a muscle injury?
Heat energy is transferred by conduction from the muscle to the cold pack.
Heat energy is transferred by convection from the cold pack to the muscle.
Heat energy is transferred by radiation from the muscle to the cold pack.
Heat energy is transferred by absorption from the cold pack to the muscle.
Which picture how's the transfer of heat by conduction?
Students were investigating thermal energy. They put a metal spoon in the freezer. They put hot water in a beaker and measured the water temperature. They removed the spoon from the freezer and put it in the beaker. After 10 minutes, the students measured the water temperature again and touched the spoon. The data are shown in the table.
Which BEST describes how the thermal energy in the water and in the spoon changed during the investigation?
The water and the spoon both lost thermal energy.
The water and the spoon both gained thermal energy.
The water lost thermal energy, and the spoon gained thermal energy.
The water gained thermal energy, and the spoon lost thermal energy.
Elaine investigated how well different materials conducted heat. She had samples of metal, wood, plastic, and rubber that were each the same size. Elaine put each sample in boiling water for five minutes and then measured its temperature. She put her results in the table. Based on the data, which material is the BEST conductor of heat?