Question: Consider a steel sphere (SG = 7.85) of diameter 2 cm, dropped from rest in water at 20C. Assume a constant drag coefficient CD =

Consider a steel sphere (SG = 7.85) of diameter 2 cm, dropped from rest in water at 20°C. Assume a constant drag coefficient CD = 0.47. Accounting for the sphere’s hydrodynamic mass, estimate (a) its terminal velocity; and (b) the time to reach 99% of terminal velocity, compare these to the results when hydrodynamic mass is neglected, Vterminal ≈ 1.95 m/s and t99% ≈ 0.605 s, and discuss.

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