The viscosity of a fluid is 0.01 Pa·s. What is the viscous force on a sphere of radius 0.05 m moving at 2 m/s?
Q1. The viscosity of a fluid is 0.01 Pa·s. What is the viscous force on a sphere of radius 0.05 m moving at 2 m/s?
Answer: 0.0628 N
Explanation: F = 6πηrv = 6π * 0.01 Pa·s * 0.05 m * 2 m/s = 0.0628 N; correct application of Stokes' law.