Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
Drexel University or The Math Forum.



Re: REALLY HARD CALCULUS MODELLING AND PROBLEM SOLVING QUESTION
Posted:
Mar 7, 2013 6:46 AM


Hi, you build 1/6 of the volume by putting equilateral triangular bodies of side length a and thickness dh on top of each other such that the top corner and the two adjacent sides are aligned. The cross section of this arrangement will be semicircular if a=sqrt(r^2h^2), where h is the height of the stack and r is the side of the body at the bottom. Then the volume as function of height h is V = 6 Integral_0^h ( sqrt(3) (r^2h^2)/4 ) dh, which is a little smaller than the volume of the half sphere of radius r if h is set to r.
Greetings Andreas



