a) Cf = \(\frac{ZN}{P} \)
b) Cf = \(\frac{PN}{Z} \)
c) Cf = \(\frac{ZP}{N} \)
d) Cf = ZPN
Answer: a
Explanation: The lubricated friction depends on the operating conditions such as the sliding speed, lubricant viscosity, temperature etc. In the formula, Z is the viscosity or oil thickness, N is the surface speed and P is the pressure caused by the weight.
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