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January 30, 2015

January 30, 2015

Posted by **Smartypants** on Saturday, June 18, 2011 at 2:56am.

(i) show tha the total surface area if the rod is given by

A = 2pieRsquare + 100pie / r

- Math -
**Damon**, Saturday, June 18, 2011 at 5:22amV = pi r^2 L = 50 pi

so L = 50/ r^2

A = 2 pi r^2 (area of ends) + 2 pi r L (area of side)

A = 2 pi r^2 + 2 pi r (50/r^2)

= 2 pi r^2 + 100 pi/r

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