MDCAT Physics MCQ #1873

The viscosity of a fluid is 0.1 Pa·s. A sphere of radius 0.05 m is moving through it at 1 m/s. What is the viscous force?

MDCAT Physics MCQ #1873

  1. Question 1

    Q1. The viscosity of a fluid is 0.1 Pa·s. A sphere of radius 0.05 m is moving through it at 1 m/s. What is the viscous force?

    • A) 0.094 N
    • B) 0.094 x 10^-1 N
    • C) 0.094 x 10^-2 N
    • D) 0.094 x 10^-3 N

    Answer: 0.094 N

    Explanation: F = 6πηrv = 6π * 0.1 Pa·s * 0.05 m * 1 m/s = 0.094 N; correct application of Stokes' law.