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In which one of the following locations can a person hear the echo of a sound? A. Less than 33.2 meters behind the reflecting surface B. Less than 16.6 meters in front of the reflecting
surface C. At least 33.2 meters behind the reflecting surface D. At least 16.6 meters in front of the reflecting surface
At least 16.6 meters in front of the reflecting surface
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Asked 6/9/2012 1:49:29 PM
Updated 3/25/2013 9:52:24 AM
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At least 16.6 meters in front of the reflecting surface
Added 3/25/2013 9:52:24 AM
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Asked 6/8/2012 9:46:01 PM
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Updated 6/8/2012 10:12:56 PM
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Added 6/8/2012 10:12:56 PM
Which of the following cools the air in a household refrigerator? A. The transfer of heat to the evaporator due to compression of the liquid refrigerant B. The transfer of heat from the air to the compressor due to expansion of the gaseous refrigerant C. Reduction of the air temperature due to condensation of the gaseous refrigerant D. Absorption of the heat from the air due to evaporation of the liquid refrigerant
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Asked 6/8/2012 10:05:53 PM
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Unlike other kinds of liquids, volatile liquids A. flow rapidly at a relatively low temperature. B. evaporate rapidly at a relatively low temperature. C. ignite readily at a relatively low temperature. D. freeze readily at a relatively high temperature.
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Updated 6/8/2012 11:01:30 PM
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Answer is B. Unlike other kinds of liquids, volatile liquids evaporate rapidly at a relatively low temperature
Added 6/8/2012 11:01:30 PM
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