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Which is not a characteristic of a heat pump? a. it is used in air conditioners. b. it uses a refrigerant. c. it requires no work. d. it reverses the normal flow of thermal energy.
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Two polarizers are oriented at 70ββ to one another. unpolarized light falls on them. what fraction of the light intensity is transmitted?
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Which one of the following is the appropriate answer for fill in
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