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Heat

Urbana Diaz avatar Urbana Diaz
25 July 2022
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20 test answers

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question
Explain what kind of heat transfer occurs when you burn yourself on a hot car seat in the summer.
answer
You were burned through conduction. Conduction requires that the objects between which heat is transferred are touching--such as your legs and a hot car seat.
question
What is the relationship between heat and thermal energy?
answer
Heat is thermal energy that is transferred from one object to another. If there is no transfer of thermal energy, there is no heat.
question
Why does water make such a good coolant?
answer
Water makes a good coolant because it has a high specific heat.
question
Why would wearing several layers of clothing keep you warmer than wearing one heavy coat?
answer
Layers of air would be trapped between the various layers, adding to the insulation because air is a good insulator.
question
Why do metals often make good conductors?
answer
They tend to have low specific heats.
question
Explain why wind blows from the shore out to the water at night along the ocean.
answer
The shore cools down much faster than the water. Because of the uneven temperature, convection currents arise. The warmer air over the ocean rises and allows the cold air from the coast to blow out to fill the space.
question
If you were going to replace water as the coolant in an engine, would you look for something with a higher or lower specific heat? Explain.
answer
You would look for something with a higher specific heat because it would absorb more heat for each degree rise in temperature.
question
Explain why a metal handrail feels colder than a wooden handrail, even though they are at the same temperature.
answer
Metal is a better conductor of heat than wood. The metal conducts heat away from your hand more rapidly so your hand feels cold at the points of contact.
question
Can an object contain heat? Why or why not?
answer
No, because heat implies that a transfer has occurred between two objects.
question
It is a cold night around the campfire. Megan is trying to get warm by sitting close to the fire and clutching her mug of hot chocolate. How is heat being transferred to chilly Megan?
answer
Megan is getting heat from the fire through radiation, and she is getting heat from the mug of hot chocolate in her hands through conduction.
question
Fast food restaurants keep food hot with infrared lamps. The heat is transferred to the food by ____.
answer
Radiation
question
Water makes a good coolant because it has a ____.
answer
High specific heat
question
Certain materials can become superconductors under what conditions?
answer
When it is very cold
question
Thermal pollution affects only fish.
answer
False
question
A good conductor transfers heat easily.
answer
True
question
On a hot summer day, heat waves can be seen rising from the asphalt. What type of heat transfer do the heat waves demonstrate?
answer
Convection
question
When a pot of water is put on a stove, the water at the top gets hot primarily by ____.
answer
Convection
question
What are superconductors?
answer
Materials that transfer energy with no resistance.
question
When a cold can of soda is insulated, the heat flow into the can on a hot day ____.
answer
Decreases
question
If you put a pot on the stove, the pot becomes hot. The heat is transferred to the pot on the burner by radiation.
answer
False