Chapter 7, Problem 8P

The surface area Sofa ring in shape of a torus with an inner radius r and a diameter d is given by:

$S={\pi }^2\left(2r+d\right)d$

The ring is to be plated with a thin layer of coating. The weight of the coating W can be calculated approximately as $W=\gamma St$ , where $\gamma$ is the specific weight of the coating material and t is its thickness. Write an anonymous function that calculates the weight of the coating. The function should have four input arguments, r, d, t, and $\gamma$ . Use the anonymous function to calculate the weight of a gold coating $\left(\gamma =0.696\text{lb/in}{\text{.}}^3\right)$ of a ring with r = 0.35 in., d = 0.12 in., and t = 0.002 in.