The Twiddled Bolts The famous MATHEMATICAL AND LOGIC PUZZLES


TWO IDENTICAL BOLTS are placed together so that their helical grooves intermesh.
If you move the bolts around each other as you would twiddle your thumbs, holding each bolt firmly by the head so that it does not rotate and twiddling them in the direction shown, will the heads (a) move inward, (b) move outward, or (c) remain the same distance from each other? The problem should be solved without resorting to actual test.

Answer:

The heads of the twiddled bolts move neither inward nor outward. 
The situation is comparable to that of a person walking up an escalator at the same rate that it is moving down.


 

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