A Sphere of Radius 2 Cm Is Moving at a Speed

question 15

Multiple Choice

A sphere of radius 2 cm is moving at a speed of 1 mm per second through a fluid with viscosity of 1000 Pa s. Assuming that Stokes' law applies, what is the viscous force on the sphere?

• A) 377 N
• B) 37 700 N
• C) 63 N
• D) 120 N
• E) 3.8 N
• ANS

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