A point mass moves along a circle of radius \( R \) with a constant...

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A point mass moves along a circle of radius \( R \) with a constant angular acceleration \( \alpha \). How much time
P is needed after motion begins for the radial

W acceleration of the point mass to be equal to its tangential acceleration?
(1) \( \sqrt{\frac{1}{\alpha}} \)
(2) \( \sqrt{\frac{R}{\alpha}} \)
(3) \( \sqrt{\frac{2}{\alpha}} \)
(4) \( \sqrt{\frac{1}{2 \alpha}} \)
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