As shown in Video V9.7 and Fig. P9.69, a vertical wind tunnel can be used for skydiving...

As shown in Video V9.7 and Fig. P9.69, a vertical wind tunnel can be used for skydiving practice. Estimate the vertical wind speed needed if a 150-lb person is to be able to “float” motionless when the person (a) curls up as in a crouching position or (b) lies flat. See Fig. 9.30 for appropriate drag coefficient data.