Question 12
Simple MachinesCalculate the velocity ratio of a screw jack of pitch 0.3cm if the length of the tommy bar is 21cm.
- A.(1/140)π
- B.14π
- C.70π
- D.140π
Show the answer and explanation
Answer: D (140π)
Explanation
V.R. = 2πL ÷ pitch = 2π × 21 ÷ 0.3 = 140π.