The viscous force FFF acting on a sphere of radius rrr moving with velocity vvv through a fluid of viscosity η\etaη is given by F=6πηrv+kr2v2F = 6\pi \eta rv + kr^2v^2F=6πηrv+kr2v2. The dimensions of kkk are:
ML⁻³
ML⁻¹T⁻¹
MLT⁻²
M⁻¹L³
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