25
The frictional torque transmitted in a flat collar bearing, considering uniform pressure, is (where r₁ and r₂ = External and internal radii of collar respectively)
- A(1/2). ¼ W (r + r)
- B(2/3). ¼ W (r + r)
- C(1/2). ¼ W [(r³ - r³)/(r² - r²)]
- D(2/3). ¼ W [(r³ - r³)/(r² - r²)]
Correct answer: D