A screw jack with a Tommy bar of length 12cm is used to raise a car through a vertical height of 25cm by turning the Tommy bar through 50 revolutions. Calculate the approximate velocity ratio of the jack [π=3.142]

by | May 22 | Physics WAEC | 0 comments

A. 21
B. 38
C. 48
D. 151

Correct Answer: Option D

D. 151

Explanation

P = 25/50=0.5

V.R = 2πD/p =(2×3.142×12)/0.5

= 151

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