A chaperone on our field trip has a mass of 90 kg. The distance from his shoulders to his knees is 60.6 cm and from one side of his ribs to the other is 31.8 cm. His arms are 84.9 cm long (shoulder to fingertip) and 18 cm wide (including the sleeves of his jumpsuit).
(a) How fast will they have to make the wind in the tunnel go to keep him from falling? (Take the density of air to be 1.2 kg/m^3 and the coefficient of drag to be 0.9.)
(b) If he arches his back even more, reducing the effective distance from his shoulders to his knees to 41.2 cm, what would the wind speed need to be to support him?