The viscosity of a fluid, denoted by u, is a measure of the fluid's resistance to deformation or flow and has dimension ML-¹T-¹ (i.e. [u] = ML-¹T-¹). Suppose a sphere of radius r falls and moves through a fluid with a speed v and experiences a drag force F. olmios Suppose the drag force F depends only on v, μ, and r. Show that the only dimensionally consistent formula for F in terms of these variables is given by F = kruv, where k is a dimensionless constant.

University Physics Volume 1
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Chapter14: Fluid Mechanics
Section: Chapter Questions
Problem 94P: Using the equation of the previous problem, find the viscosity of motor oil in which a steel ball of...
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The viscosity of a fluid, denoted by u, is a measure of the fluid's resistance
to deformation or flow and has dimension ML-¹T-¹ (i.e. [u] = ML-¹T-¹). Suppose a
sphere of radius r falls and moves through a fluid with a speed v and experiences a drag
force F.
Suppose the drag force F depends only on v, u, and r. Show that the only dimensionally
consistent formula for F in terms of these variables is given by F = kruv, where k is a
dimensionless constant.
Transcribed Image Text:The viscosity of a fluid, denoted by u, is a measure of the fluid's resistance to deformation or flow and has dimension ML-¹T-¹ (i.e. [u] = ML-¹T-¹). Suppose a sphere of radius r falls and moves through a fluid with a speed v and experiences a drag force F. Suppose the drag force F depends only on v, u, and r. Show that the only dimensionally consistent formula for F in terms of these variables is given by F = kruv, where k is a dimensionless constant.
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