1 䳺 (. 4.7) : P1=m1g; 1 Y1, S5 S4.
4.7
1 Z.
. (4.1)
, , 䳺 . , (4.1) S5 , S4 䒺.
1 Z
(4.2)
2 ( 4.8) : P2=m2g, 2 Y2, S4`, 1 S2 N2.
2 (. 4.8) Z
(4.3)
= , 2 Z 2
(4.4)
4.8
3 (. 4.9), 䳺 3=m3g, NA NB, 2, Y ( Y 3)
(4.5)
(4.1), (4.3) (4.5)
, . (4.6)
4.9
(4.1), (4.3), (4,5), (4,6), , (4.2) (4.4),
, ,
t1=2c,
1 2 .
ҳ 1 (. 4.7)
(4.7)
ҳ 2 ( 4.8)
(4.8)
3 (. 4.9) :
(4.9)
(4.7) (4.9) 1, 2 , XC3 3 .
(4.8)
: x1, y1, x2, y2, N2, NB, NA.
, -
(4.9)
3 Z (. 4.9) 3
(4.10)
ҳ 3 , (4.10)
(4.11)
(4.6), (4.9) (4.11),
. 5 㳿
(. 4.1-4.5) . 3 t=t1.
. . 1 2 .
4.1 m1, m2, m3 1, 2 3; R1, R2, r2 1 2; 2 2 .
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