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The boy of mass 30 kg is at r1= 2 meters from the fulcrum. of the girl is 45 kg, at what r2 must she sit so that they are balanced ?
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Awhite-blue star is hotter than a red star. select the best answer from the choices provided true or false
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What is the period of a wave traveling 5 m/s if its wavelength is 20 m/s
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