







Archimedes' formula for parabolic arches 
20090123 

La pose la question : Use calculus to verify Archimedes' formula for y=9x^2. Prove Archimedes' formula for a general parabolic arch. Harley Weston lui répond. 





A fountain of water jets forms parabolic arches 
20060503 

Jennifer pose la question : Let's say in you have a fountain and the water jets form parabolic arches. The center of the fountain, being the origin of the coordinate system, it is elevated 5 feet off the ground, . The equation formed the water arch is y= x^{2}+4x, what is the radius of the basin needed to catch the water at ground level? Stephen La Rocque lui répond. 





Bridges and parabolas 
20001118 

Lauren pose la question : My name is Lauren, and Im a secondary school student in Ontario. For my gr11 advanced math class I have to find out how and why parabolics are used in arch bridges and write 3 paragraphs on it. People who cohse satelites and whatnot are lucky  I've found a ton of info, but for arch bridges there seems to be nothing. Harley Weston lui répond. 

