1.

What is the co-efficient of friction for lubricant?

A. Cf = \(\frac{ZN}{P} \)
B. Cf = \(\frac{PN}{Z} \)
C. Cf = \(\frac{ZP}{N} \)
D. Cf = ZPN
Answer» B. Cf = \(\frac{PN}{Z} \)


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