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I would like to try the wall-moving demo described below.
1. Is the aluminum rod held in a horizontal or a vertical position next
to the wall?
....or does the free end of the rod extend into the room?
2. is the flat piece of metal (or cube) attached to the wall or to the
top of a horizontal table?
3. Will it make any difference if the aluminum rod is much longer or much
shorter than 30 cm??