The torque required to overcome viscous resistance of a collar bearing is (where R1 and R2 = External and internal radius of collar)
A. $$\frac{{\mu {\pi ^2}{\text{N}}}}{{60{\text{t}}}}\left( {{{\text{R}}_1} - {{\text{R}}_2}} \right)$$
B. $$\frac{{\mu {\pi ^2}{\text{N}}}}{{60{\text{t}}}}\left( {{\text{R}}_1^2 - {\text{R}}_2^2} \right)$$
C. $$\frac{{\mu {\pi ^2}{\text{N}}}}{{60{\text{t}}}}\left( {{\text{R}}_1^3 - {\text{R}}_2^3} \right)$$
D. $$\frac{{\mu {\pi ^2}{\text{N}}}}{{60{\text{t}}}}\left( {{\text{R}}_1^4 - {\text{R}}_2^4} \right)$$
Answer: Option D
This Question Belongs to Mechanical Engineering >> Hydraulics And Fluid Mechanics In ME
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