Question

A screw Jack whose pitch is 2mm is used to raise a bus of mass 900kg through height of 20cm. The length of the Tommy of the Tommy of the jack is 40cm. Calculate the velocity ratio of the machine

Answer 1

R= 40cm —> R= 0.4 m

P= 2mm —> P= 0.002 m

$V.R = \frac{2πR}{p} = \frac{2 \times 3.14 \times 0.4}{0.002} = 1256$

I think this is the answer

I hope I helped you

Good luck ^_^