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9. Through which one of the following mediums is the velocity of a sound wave the greatest? A. Steel B. Lead C. Water D. Air
Sound would travel fastest through lead.
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Asked 6/9/2012 2:07:02 PM
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The waste products of combustion leave the internal combustion engine through the A. crankshaft. B. cylinder. C. exhaust valve. D. intake valve.
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Asked 6/8/2012 9:46:01 PM
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A temperature of 273 K is the temperature at which water A. evaporates. B. boils. C. freezes. D. lacks any moving molecules.
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Updated 6/8/2012 10:12:56 PM
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D. freezes. A temperature of 273 k is the temperature at which water freezes.
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
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