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.
\(\frac{P}{2 \pi r}\)
Correct Answer: Option B
Explanation
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