A-LevelPhysicsPhysical quantities and units9702/12 · Oct/Nov 2010 · Q21 Mark
The frictional force F on a sphere falling through a fluid is given by the formula F = 6πηv where a is the radius of the sphere, η is a constant relating to the fluid and v is the velocity of the sphere. What are the units of η?
Akg m s⁻¹
Bkg m⁻¹ s⁻¹
Ckg m s⁻³
Dkg m⁻³ s⁻³
✓ Correct answer
B: kg m⁻¹ s⁻¹
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