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From: Leigh Palmer <palmer@sfu.ca>
To see that the horizontal component is present (Donald knows
this already, which is why he suggested the frictionless tube
in the first place) one need merely consider what the rope is
doing at the midpoint of its slide off the table. The portion
of the rope which is still on the tabletop will be moving
horizontally, thust the rope has a horizontal component of
momentum. It is easy to see, then, that there must have been
a horizontal force acting on the rope.