Re: Correct Answer

[herbgottlieb@juno.com]

 LUDWIK KOWALSKI  writes:
> A real experiment (suspending rod by a string attached to one end and
> applying opposite horizontal forces to each end of the rod) can also be
> performed using two pulleys. Each pulley must be adjusted vertically 
> to make sure F1 and F2 remain horizontal.

Now, to make it more interesting, suspend one end of a 200 cm rod from an
overhead support by means of a vertical string that is only 2 cm long.
Now... attach a horizontal string to the top end of the rod and another
horizontal string to the bottom of the rod  with a 1 kg brass weight
attached to the free end of each of these two strings (using Kowalski
pulleys) to apply equal and opposite horizontal forces to the rod ends. 

Herb Gottlieb from New York City
(Where we doubt that the 2 cm string will still be be vertical after the
adjustments are made and the system reaches equilibrium) 
>