Velocity of a small particle of diameter Dp at a distance r from the rotational axis of a cyclone rotating at an angular speed ? is given by (the other symbols are as per standard notation) ?
A. [(DP2/18). (?s ?/?)] ?2r

B. [(DP2/18). (?s ?/?)] ?2r

C. [(DP/18). (?s ?/?)] ?2r2

D. [(DP/18). (?s ?/?)] ?2r

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