Friday, November 19, 2010

Test 9

How is thermal energy related to temperature and heat?
Thermal Energy is the energy of particles in an object when they move around because of temperature and heat. Heat is the transfer of one thing to another, using radiation, convection, or conduction. Temperature is the measurement and expression of thermal energy and heat.


Why do some materials get hot more quickly than others?
Everything has a specific heat measurement. Specific heat is the amount of energy need to change a substance in temperature. Things that have higher specific heat need more energy and time to heat up than substances with low specific heats.


What are the three forms of heat transfer? Please describe each.
In a nutshell, the three forms of heat are conduction, convection, and radiation. Conduction is the transfer of heat through substances when they are not moving. An example of this is me holding a cold rock and it receiving heat. Convection is the movement of heat through molecules of fluids.
An example of this is a pot of water boiling. Radiation is the release and movement of heat through electromagnetic waves. An example of this would be a microwave.


How much heat is required to raise the temperature of 5kg's of water by 10kg's?
(turn in answer)

5. Tent or Fire?
I would choose a tent. The best way to stay warm is to trap the heat instead of created mass amounts of it. If you use your body heat and trap it using layers and a tent, then you will be able to stay warmer than standing near a large heat source, for that source's heat is expelled, and little of the heat actually reaches you.

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