What happens when a magnet falls through a copper pipe?

David Neves
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Check out the following video of a magnet falling through a copper pipe.

http://www.sciencealert.com/watch-what-happens-when-a-magnet-is-dropped-through-a-copper-pipe
 
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Talk about damping.
 

Thread 'How can we teach students the difference between sequences and series?'

Sequences and series are related concepts, but they differ extremely from one another. I believe that students in integral calculus often confuse them. Part of the problem is that: Sequences are usually taught only briefly before moving on to series. The definition of a series involves two related sequences (terms and partial sums). Both have operations that take in a sequence and output a number (the limit or the sum). Both have convergence tests for convergence (monotone convergence and...
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