[填空题]
During a Chicago storm, winds can whip horizontally at n5 nslt/ah6n6 speeds of 17 qx yhl yk9du7,st 9/,kiunyurj w2.200km/h If the air strikes a person as u./7yridkyu2w29qkt n ,j9 y,xulh7t the rate of 40kg/s per square meter and is brought to rest, estimate the force of the wind on a person. Assume the person is 1.50 m high and 0.50 m wide. Compare to the typical maximum force of friction $\mu\approx1.0$ between the person and the ground, if the person has a mass of 70 kg. N
$F_{on person}$ $F_{fr}$
