Heat

Which best describes the direction of heat?

from a warmer substance to a cooler substance

Which factors affect heat transfer between a warm and a cool substance?

the amount of time of contact, the area of contact, and the specific heats of the substances

Which substance is most likely to heat up the fastest?

copper (specific heat of .39 /g • C°)

If a cup of coffee is at 90°C and a person with a body temperature of 36°C touches it, how will heat flow between them?

from the cup to the hand

The metal aluminum coils in an air conditioner conduct thermal energy from inside the house and release it outside the house. What can be said about the coils when they are accepting the heat inside the house?

They must be cooler than the air inside the house.

Shelly tells a friend that her computer needs to be fixed because it has been producing a lot of heat and is smoking. Where is the error in her statement?

Her computer is producing thermal energy, not heat.

Mintu wants to increase the heat transfer between a metal iron and another piece of metal he wants to shape. He decides to increase the time the two metals are in contact, use a larger metal iron, and use a new metal material with a higher specific heat

Mintu should have chosen a material with a lower specific heat.

Which refers to the amount of heat required to change the temperature of 1 gram of a substance by 1°C and is related to the chemical composition of the substance?

Specific heat

What must be true about two objects if heat is flowing between them?

The objects must be different temperatures.

Which substance has the most thermal energy and will have the most heat flow from it?

a nuclear reactor core (1000°C)

Heat is most closely related to which kind of energy?

thermal

Ixchelt burns her tongue when she takes a sip of hot coffee from her mug. Which part of this example represents heat?

the thermal energy moving from the coffee to her tongue

A burner on a stove produces

thermal energy.

Which best explains why water boils in a pot sitting over fire?

Thermal energy from the fire moves to the water in the form of heat.

Isaac wants to make s'mores. He holds a marshmallow on a metal skewer over a fire. A few seconds later, the marshmallow is cooked and the skewer feels warm. What most likely happened?

Thermal energy in the form of heat moved from the fire to the skewer and marshmallow.

Which direction does heat flow from?

hot to cold