Objective 5
1. Heat engines turn thermal energy into mechanical energy.
2. An external combustion engine performs conduction as it heats up a different object as its work. An internal combustion engine is powered by radiation because they are fueled by fire/combustion. They both turn heat into energy that can fuel the automobiles.
3. Internal combustion engines are used more frequently because they deliver power better and they weigh less than external combustion engines.
4. The refrigerator takes the hot air out, verses what we think, putting cold air in.
5. The compressor compresses the gas in the refigerator. This causes the temperature to rise. So, the heat-exchanging coils allow the refrigertant to disperse the hot air.
Citations:
1.http://wiki.answers.com/Q/Why_is_a_car_engine_an_internal_combustion_engine_rather_than_an_external_combustion_engine
2. http://home.howstuffworks.com/refrigerator2.htm
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