A. 1:50
B. 3:20
C. 3:4
D. 4:3
E. 20:3
Correct Answer:
Option C – 3:4
Explanation
Rx = 15/0.2 = 75
Ry = 20/0.2 = 100
Rx : Ry = 75 : 100 = 3 : 4
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![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 [Ï€=3.142]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "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 [Ï€=3.142]")