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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 = \(\frac{PN}{Z} \) | |