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Created for Albert.io. Copyright 2016. All rights reserved.

A conical pendulum consists of a ball attached to a string that moves in a horizontal circle, as shown in the figure above.

Which of the following expressions correctly gives the speed at which the ball is traveling in terms of $l$, $\theta$ and universal constants?

A

$ \sqrt {lg} $

B

$ \sqrt {lg\sin\theta} $

C

$ \sqrt {lg \cos\theta} $

D

$ \sqrt {lg\tan\theta} $

E

$ \sqrt {lg \sin\theta \tan\theta} $

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