The drag force on a falling object is F_D = ½ CρAv², where A is the cross-sectional area, v the velocity, ρ the air density and C the drag coefficient.

The sphere (mass 49 g, falling at terminal velocity so that the drag force equals its weight, found in (c)) is falling in air at a terminal velocity of 25 in SI base units.

The density of the air is 1.2 in SI base units.

The diameter of the sphere is 0.060 in SI base units.

Use your answer in (c) to calculate the drag coefficient C for the sphere.