In a flat collar pivot bearing, the moment due to friction is proport

1.	In a flat collar pivot bearing, the moment due to friction is proportional to
A.	(r₁² - r₂²)/(r₁ - r₂)
B.	(r₁² - r₂²)/(r₁ + r₂)
C.	(r₁³ - r₂³)/(r₁² - r₂²)
D.	(r₁³ - r₂³)/(r₁ - r₂)
Answer» D. (r₁³ - r₂³)/(r₁ - r₂)

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In a flat collar pivot bearing, the moment due to friction is proportional to

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