Speed of the train from rest
A freight train has a mass of 1.6 × 107 kg. If the locomotive can exert a constant pull of 6.6 × 105 N, how long does it take to increase the speed of the train from rest to 86 km/h?
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Three equal point charges, each with a charge of 1.60 mu C, are placed at the corners of an equilateral triangle whose sides have a length of 0.450 m. What is the potential energy of the system? (Take as zero the potential energy of the three cha
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