Warm Up for Heat Transfer

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

A small ice cube at a temperature of 0°C is dropped into a glass of water at 28°C and melts. What is the temperature of the water in the glass just after the ice cube melts? 

• 0 degrees Celsius
• between 0 degrees Celsius and 28 degrees Celsius
• 28 degrees Celsius
• greater than 28 degrees Celsius

The area in front of a fire feels warm. What are the processes that make the people in front of a fire feel warm?

• conduction and convection
• radiation and conduction
• radiation and convection
• radiation, convection, and conduction

10. Which best describes the process of convection? 

• Convection is the primary way heat travels through rays.
• Convection is the primary way heat travels through metals.
• Convection is the primary way heat travels through appliances.
• Convection is the primary way heat travels through liquids and gasses.

In what way does the Sun warm Earth? 

• radiation
• convection
• conduction
• condensation

Which is most responsible for the uneven heating of the air in the atmosphere? 

• radiation
• convection
• conduction
• condensation

Heat moves through the atmosphere as air circulates. What causes the circulation of air? 

• Air in the atmosphere is heated by the sun and sinks to the ground.
• The ground is heated by the sun and then heats the air, causing the air to rise.
• Air loses heat to the ground and then rises upward to obtain more energy.
• The sun heats the clouds which forces the cooler air to move away and sink.

What keeps the water at the top of pot of boiling water the same temperature as that of the bottom?  

• Heat from the burner radiates through the liquid and causes even heating.
• Evaporation heats the water at the top and the eye of the stove heat the water at the bottom.
• The walls of the beaker reflect heat toward the center, so the water heats evenly.
•  Heated water molecules and steam rise in the pot, carrying heat by convection. 

Kelly was sunburned at the beach, and her mother applied lotion to the burn. Why did this make her sunburn feel better? 

• The coolness from the lotion was conducted into the burn. 
• The coolness from the lotion was raidated into the burn. 
• The heat from the burn was conducted into the lotion.
• The heat from the burn was radiated into the lotion. 

Which best explains how bacon is fried on a stove burner?  

• The bacon creates a convection current, the heat rises to the pan, and then rises to the stove burner.
• The bacon transfers heat directly to the pan, and the pan transfers heat directly to the stove burner.
• The stove burner radiates heat to the pan, and the pan radiates heat to the bacon.
• directly to the pan, and the pan directly transfers heat to the bacon.