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DPCalculus
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Homework Statement
You have been employed but(sic) the Mathematics Football League (MFL) to design a football. Using the volume of revolution technique, your football design must have a capacity of 5L ± 100mL. You must present a statement considering the brief below. Just a quick side note, I have checked and it cannot be spherical, it must be in the normal elliptical rugby or gridiron shaped ball (roughly).
Brief:
- The volume of revolution technique is to be used
- The football must have a capacity of 5L ± 100mL
- You should use a single non-linear function
- You must explain carefully all the steps that you take in choosing the function and the dimensions of the football
- You may use numerical methods (trapezium rule, numerical integration or a graphing package) in the design of the football
Homework Equations
- V=π∫[f(x)]^2 dx (from a to b) -> Sorry I don't know how to add the boundaries in properly
- V=π∫[f(x)-g(x)]^2 dx (from a to b)
- V=π∫[f(y)]^2 (from a to b - along the y-axis)
- x(turning point)=-b/2a
- T=2π/b
- Quadratic Formula
- y=ax^2+bx+c
- y=sin(x)
- etc.
The Attempt at a Solution
Here's some of my attempts at the solution. (I have done it in a million different ways and cannot seem to get it, I either got somewhere between 2000 and 4500mL and 6000-7000mL. Most of my working is just me picking up small errors in the calculations. The processes in the photos are pretty much the different processes I attempted the solution with) Sorry for the bad camera, thanks in advance.