Heat transfer

A student places a cup of cold water on a counter in a hot room.   After a short time, the student notices that the water in the cup is no longer cold.  Which best explains why the water in the cup is no longer cold?

• The coldness of the water transferred to the air, making the water in the cup warmer.
• The coldness of the water was conducted to the cup, making the water in the cup warmer.
• The heat from the air transferred to the water in the cup, making the water in the cup warmer.
• The heat from the air caused the cold water in the cup to condense, making the water warmer.

Heat/magma moving under Earth's mantle; hot magma rises and cold magma sinks...

• Conduction

• Convection

• Radiation

Which of the following best describes a vacuum?

• Hot

• Cold

• Shiny

• Empty

Which best explains how convected heat causes a hot air balloon to stay in the air?

• The heat is falling and replacing cooler air.

• The heat is produced from the rising of air currents.

• The heat is absorbed through the balloon from the sun.

• The heat is rising and circulating, causing the balloon to stay up in the air.

Heat from a heat lamp...

• Conduction

• Convection

• Radiation

Which is the best choice for the handle of a frying pan?

• Metal, because it conducts heat.

• Wood, because it conducts heat.

• Metal, because it does not conduct heat.

• Wood, because it does not conduct heat.

Jim wakes up early in the morning and walks from his carpeted bedroom to the tiled kitchen. Which BEST describes why, despite being the same temperature, the tile floor feels cooler to his feet than the carpet?

• A. Tile is a better conductor of heat and transfers heat away from his skin.

• B. Carpet is a bad conductor of heat and transfers heat to his skin.

• C. Tile is a poor conductor of heat and transfers heat to his skin.

• D. The tile and carpet are the same temperature

Which best describes the flow of heat?

• from a larger object to a smaller object

• from a warmer object to a cooler object

• from a cooler object to a warmer object

Jill notices that her skin gets burned when she sits out in the sun. What best explains why this happens?

• The soil is convecting heat into the air.
• The heat from the sun is being conducted to the Earth.
• The heat from the sun is radiating down to Earth’s surface.

What is the transfer of heat by direct contact?

• Convection
• Radiation
• Conduction