An experiment to investigate the drag force on smooth spheres consists of dropping stainless steel (ρ = 8010 kg/m3) balls of different diameter in glycerin at 20°C. The time for the balls to fall between two lines 25 cm apart is recorded. It is assumed that the balls are falling at constant velocity such that the drag force is FD= Vballg(ρball− ρglycerin). Plot CD versus Re based on the following data:
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