An aluminum cylinder (SG = 2.7) slides concentrically down a taut 1-mmdiameter wire as shown in the figure. Its length is L = 8 cm and its radius R = 1 cm. A 2-mm-diameter hole down the cylinder center is lubricated by SAE 30 oil at 20°C. Estimate the terminal fall velocity V if ambient air drag is (a) neglected; or (b) included. Assume air at 1 atm and 20°C.

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Oil film