The drag force per unit length, F, acting on a cylinder of diameter D moving at velocity ? perpendicularly to its axis through a fluid of density ? and viscosity ? depends only on D, ?, ?, and ?. Use the data in Table 2 to estimate the force per unit length acting on a cylinder of diameter 0.1 m moving at 61 ms^-1? through air.

density p viscosity 7 cylinder Nsm- fluid velocity v drag force per unit length F Nm-! kg m- diameter m 1.00 x 10-3 0.0I 30 998 mercury 13 546 1.30 4500 water 5.5 6! 700 1.83 x 10-s 0.10 air