Wed 20 Apr, 2005 10:07 am - A parabola has the property that all axial rays reflect converging to a single point, its focus.
What is the shape of the locus in a catenary ? Cannot be a point; is it a line, or a circle, or... (view)
Wed 20 Apr, 2005 09:59 am - Two identical ships next to each other in the middle of a river heading against the current; one at nearly full throttle developing 450 horsepower just counteracts the current and does not advance... (view)
Mon 11 Apr, 2005 10:47 am - Hi.
The world is way overpopulated since the fifties.
And the worse areas are where their national sport seems to be making more babies with no means to sustain them decently.
The figure ONE... (view)
Tue 5 Apr, 2005 02:56 pm - Hello.
It's been over 30 years since my days at the university and have trouble thinking...
A parabola reflects all the axial rays converging to a focus. A focus is a point. [b]A single... (view)
