Calculate the velocity ratio of a screw jack of pitch 0.2...
Calculate the velocity ratio of a screw jack of pitch 0.2cm if the length of the tommy bar is 23cm
230\(\pi\)
23\(\pi\)
70\(\pi\)
140\(\pi\)
Correct answer is A
P = 0.2cm, L = r = 23cm
| VR | = | 2πr
P |
= | 2πL
P |
= | 2π×23
0.2 |
= | 230π |