A screw jack with a Tommy bar of length 12cm is used to raise a...
PHYSICS
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 [π=3.142]
- A. 21
- B. 38
- C. 48
- D. 151
Correct Answer: D. 151
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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