What is concave mirror?
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What is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ? a. 10% b. 20% c. 80% d. 25%
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Is the portion of the electromagnetic spectrum that has a frequency just above that of visible light.
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What surface does the epithelial tissue cover? a. the surface of the body b. lines internal organs c. forms many glands d. all of the above
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5. why should the electrons be placed separate from each other (why not together)?
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