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Two bumper cars in an amusement park ride collide elastically as one approaches the other directly from the rear. Car A has a mass of 435 kg and Car B 495 kg, owing to differences in passenger mass...

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I use to attend the amateur astronomy meeting on Friday nights at Duke. While as I liked astronomy, I was only a bit interested in viewing stars via a telescope on a cold winter night. I must confess that the real reason I would attend the meeting was that it was run by a physics professor who specialized in string theory. What a great occasion to discuss and learn about string theory from a world... read more