The drag force per unit length, F, acting on a cylinder of diameter D moving at velocity v perpendicularly to its axis through a fluid of density p and viscosity n depends only on D, p, n and v. 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- through air. Table 2 fluid density p viscosity n cylinder kgm- Nsm-i velocity v ms- drag force per unit length F Nm- diameter m 998 1.00 x 10-3 0.01 1.55 x 10-3 0.01 1.83 x 10-s 0.10 water 30 5.5 4500 mercury 13 546 air 700 1.30 61

The drag force per unit length, F, acting on a cylinder of diameter D moving at velocity v perpendicularly to its axis through a fluid of density p and viscosity n depends only on D, p, n and v. 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- through air. Table 2 fluid density p viscosity n cylinder kgm- Nsm-i velocity v ms- drag force per unit length F Nm- diameter m 998 1.00 x 10-3 0.01 1.55 x 10-3 0.01 1.83 x 10-s 0.10 water 30 5.5 4500 mercury 13 546 air 700 1.30 61