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7. A student is doing an experiment using a 200 W heat plate. He is heating a 300 g block of ice at -20 C

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7. A student is doing an experiment using a 200 W heat plate. He is heating a 300 g block of ice at -20 C to water a 20 C. How long will it take? 20OW 8. A portable stereo requires 265 J of energy to operate the CD player, yielding 200 J of sound energy. How efficiently does the stereo generate sound energy

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