You want to reproduce the experiment shown in the text which illustrates the wake behind a sphere

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You want to reproduce the experiment shown in the text which illustrates the wake behind a sphere falling in water at the point where the boundary layer undergoes transition from laminar to turbulent. If the sphere is made of steel with a density of $500 \mathrm{lb}_{\mathrm{m}} / \mathrm{ft}^{3}$, what should the diameter be?

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