Calculate the velocity ratio of a screw jack of pitch 0.3cm if the length of the tommy bar is 21cm
- \(\frac{1}{140}\)\(\pi\)
- 14\(\pi\)
- 70\(\pi\)
-
140\(\pi\)
The correct answer is: D
Explanation
V.R = \(\frac{2\pi L}{p}\)= \(\frac{2 \times \pi \times 2}{0.3}\)
V.R = 140\(\pi\)