A screw jack with a Tommy bar of length 12cm is used to raise a...

WAEC 2001

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 [\(\pi = 3.142\)]

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

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Correct Answer: Option D

Explanation

P = \(\frac{25}{50} = 0.5\)

V.R = \(\frac{2\pi D}{p} = \frac{2 \times 3.142 \times 12}{0.5}\)

= 151

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A screw jack with a Tommy bar of length 12cm is used to raise a...

Correct Answer: Option D

Explanation

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