When a student combed his dry hair for a long time, his hair began to stand up. which of these has most likely happened? a) the comb and hair have become charged with similar charges. b) the comb and hair have become charged with opposite charges. c) the comb has become charged, but the hair has remained neutral. d) the hair has become charged, but the comb has remained neutral.
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Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?
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When a student combed his dry hair for a long time, his hair began to stand up. which of these has m...
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