WAEC Physics 2014 Objective — Question 16
Question 16 of 50 from the West African Examinations Council (WAEC) Physics 2014 Objective paper, with the correct answer and a full explanation.
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A screw-jack has the distance between its successive threads as P and the length of its tommy bar as r. Its velocity ratio is given by the expression
- A. 2πr²/P
- B. 2πr/PCorrect
- C. 2π/rP
- D. P/2πr
Explanation
Velocity ratio of a screw jack = distance moved by effort / distance moved by load = 2πr/P.
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