In a physics lab, students measure the sedimentation velocity v of spheres with radius r falling through

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In a physics lab, students measure the sedimentation velocity v of spheres with radius r falling through a fluid. The expected relationship is v = 2r2 g(ρ − ρf)/(9η). 

(a) How should the students plot the data to test this relationship? 

(b) How could they determine the value of η from their plot, assuming values of the other constants are known?

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