3 ms·
No there is not that symmetry, because the helix is handed, and the result could depend on the rotation direction with respect to that handedness.
by aj7 2y ago
No there is not that symmetry, because the helix is handed, and the result could depend on the rotation direction with respect to that handedness.
- deleted 2y ago[deleted]
- foodevl 2y agoRelative to the handedness, one bolt is always moving with it, one bolt is always moving against it. Switching direction doesn't change that. So switching direction can't change whether it moves inward or outward.
- rdlw 2y agoCouldn't you transform twiddling one way into twiddling the other way by reflecting through a mirror and turning the bolts 180 degrees end-over-end? If you start with the bolts moving North, the mirroring makes them go South, and turning them around makes them go North again, but now you're twiddling the other way. So the bolts would have to go North no matter which way you twiddle them, so either twiddling is not reversible (which is a repugnant proposition) or they must have a speed of 0.