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A convex lens has a focal length of 10 cm. If a object is placed 20 cm from the lens, then
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If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?
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The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?
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Acalorimeter uses the principle that thermal energy flows from hotter material to colder material until both reach the same
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