, , . , .
, , (. 2.2):
F 1= mg = p×V×g;
F = p×V×g ( );
, :
F = 6p×h×r×v,
r ;
r ;
V ;
g .
: F 1 , F 2 F 3 .
F 1 F F = m dv/dt (2.3)
, dv/dt , , 0.
(2.3) :
(r-r)V× g 6p×h×r×v0 = 0 (2.4)
v 0.
(2.4) h,
(2.5)
, V = r 3, r = d/ 2, v 0 = l/t,
d ;
l , t,
(2.5)
(2.6)
, h d, l t.
.
, , (2.3.), :
(2.7)
(2.7)
I ;
R ;
1 2 ,
F , ,
F .
, , v0, 0.
(2.7), , :
r×V×g = 6 p×h×r×v 0 (2.8)
. (2.8)
(2.9)
(2.6) :
(2.10)
(2.10) (2.6) d, l, t.
.
, , , l . , v 0 (. 2.2).
(. 2.3): , , . , .