wu :: forums
        (http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/YaBB.cgi)
      

        riddles >> hard >> find the equation
        
(Message started by: Christine on Mar 5th, 2008, 1:46pm)
Title: find the equation
Post by Christine on Mar 5th, 2008, 1:46pm
This past weekend I installed a new bi-fold door on a closet in the attic. The door consists of two panels, each one foot wide, hinged together in the middle. One side of one panel is fixed to the wall, while the other side of the other panel runs along track along the top of the door. As the door opens and closes, it rubs against a carpet on the attic floor, tracing out a path on the carpet pile.
What is the equation of the path traced out by the door on the carpet?

Title: Re: find the equation
Post by Grimbal on Mar 5th, 2008, 2:02pm
I would guess a segment of a circle and a segment of a hypocycloid (http://mathworld.wolfram.com/Hypocycloid.html).


Powered by YaBB 1 Gold - SP 1.4!
Forum software copyright © 2000-2004 Yet another Bulletin Board