Wednesday, August 2, 2017

Sending A Signal Faster Than Light

A bit of a brain-teaser for physics-major types, and anyone else who's interested in Einstein-type thought experiments.

When a line rotates, its point of intersection with with another line can move with great speed—in fact, unbounded speed.

What if we replace the rotating line with a real laser beam, and we replace the stationary line with something like a long, straight piece of flammable string—could we then transmit a faster-than-light signal by burning the string?

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