http://i595.photobucket.com/albums/t...alcproblem.jpg

http://i595.photobucket.com/albums/t...cbungeepic.jpg

(a) Assuming the cord to be a cylinder with a volume remaining constant as the cord stretches, at what rate is the radius changing when the radius is 1/2''?

(b) From your observation point, at which rate is the angle of the elevation to the jumper changing when the radius is 1/2'' ?