The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)

The torque required to overcome viscous resistance of a footstep beari

1.	The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)
A.	π²NR/60t
B.	π²NR²/60t
C.	π²NR³/60t
D.	π²NR⁴/60t
Answer» E.