for the atmosphere at sea level [11]. The characteristic linear dimension can be estimated as
L » 0.2 m
for an average cat [2]. According to [6] the rounded terminal velocity is
» - v 30 m s . t 1
Thus the Reynolds number for a falling cat is about
· =
´ - R 30 0.2
1.460 10 1000, 5
so the drag will be turbulent and thus it is more convenient to use the drag force in the form
F C Sv = r
1
2 d , 2
where C is the drag coefficient, r = - 1.225 kg m 3 is the density of the fluid [11], S is the
orthographic projection of the object on a plane perpendicular to the direction of motion and v