A screw-jack has the distance between its successive threads as P and the length of its tommy bar as r. Its velocity ratio is given by the expression
-
A.
(frac{2 pi r^2}{P}) -
B.
(frac{2 pi r}{P}) -
C.
(frac{2 pi}{rp}) -
D.
(frac{P}{2 pi r})
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