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Jim has been contemplating red shift again... and likenes the concept to a non-stationary spaghetti machine.
The machine spits out a piece of spaghetti at a fixed frequency and therefore a fixed length. When the spaghetti machine is receeding the piece of spaghetti that comes out gets a bit longer
(and a bit thinner).
Jim decides to see if he can make a standard torch last a few metres longer than usual by mounting it on a rotating disk in such a way that the torch illuminates the subject only when it is receeding.
||I expect the additional battery life would compare quite poorly to the power needed to run the rotating disc.