Created by StemPy LabThe minute hand and the hour hand of a clock are together at 12 o'clock. After how long are they together again?
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← The potential energy of a particle moving along a line is U(r) = a/r² - b/r for r > 0, where a and b are positive constants. The particle can be in equilibrium atA bullet of mass 20 g moving at 300 m/s passes straight through a wooden block of mass 1 kg that rests on a smooth horizontal floor. It comes out of the other side at 100 m/s. The speed of the block afterwards, and the kinetic energy turned into heat and sound, are →
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