A screw jack with a Tommy bar of length 12cm is... - WAEC Physics 2001 Question
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
correct option: d
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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