Question

A common demonstration, illustrated in figure, consists of a ball resting at one end of a uniform board of length, that is hinged at the other end and elevated at an angle $\theta$. A light cup is attached to the board at $rc$ so that it will catch the ball when the support stick is removed suddenly. The ball will lag behind the falling board when $\cos \theta$ is bigger than $\qquad$ A) $\sqrt{\frac{1}{4}}$ B) $\sqrt{\frac{2}{5}}$ C) $\sqrt{\frac{2}{3}}$ D) $\sqrt{\frac{3}{4}}$ E) $\sqrt{\frac{3}{8}}$

          A common demonstration, illustrated in figure, consists of a ball resting at one end of a uniform board of length, that is hinged at the other end and elevated at an angle $\theta$. A light cup is attached to the board at $rc$ so that it will catch the ball when the support stick is removed suddenly. The ball will lag behind the falling board when $\cos \theta$ is bigger than
$\qquad$
A) $\sqrt{\frac{1}{4}}$
B) $\sqrt{\frac{2}{5}}$
C) $\sqrt{\frac{2}{3}}$
D) $\sqrt{\frac{3}{4}}$
E) $\sqrt{\frac{3}{8}}$

A common demonstration, illustrated in figure, consists of a ball resting at one end of a uniform board of length, that is hinged at the other end and elevated at an angle θ. A light cup is attached to the board at rc so that it will catch the ball when the support stick is removed suddenly. The ball will lag behind the falling board when cosθ is bigger than

A) √((1)/(4))
B) √((2)/(5))
C) √((2)/(3))
D) √((3)/(4))
E) √((3)/(8))

Added by Derrick F.

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