A conical pendulum of length d swings in a horizontal circle of radius r, as shown. If \omega is the angular frequency of this motion, what is \omega^{2} ?
Answer Choices
A. g / d
B. g / r
C. g / \sqrt{d^{2}+r^{2}}
D. g / \sqrt{d^{2}-r^{2}}
E. g / \sqrt{d r}
