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A metal rod of 3 cm in diameter as shown in the figure is enclosed by a 10 cm length shell with radial clearance of 0.02 mm. The effective weight of shell is 7.5 N when submerged in oil of viscosity 6 poise. Determine the velocity with which the shell will slide down. oil rod shell 10 cm 0.02 mm 011 3 cm Answer Choices: a. 7.85 cm/s b. 2.65 cm/s c. 1.05 cm/s d. 5.25 cm/s