, .
. N 35, N 34, N 45, N 67 , . 2. 9.
( ) 3-5 . , = 1 . N 35 I-I . 4.
4 12 . .
S m 4= 0, R ∙2 d + N 35∙ r 1= 0. (r 1 = h cosa1)
Ra, 2 d / r 1:
. . N 35 = (. . R) = (. . R) = - (. . R).
N 35 1∙2/cosa1. , . 12 4 .
=1 1 2 . .
S m 4= 0, R ∙4 d + N 35∙ r 1= 0.
. . N 35 = (. . R) = (. . R) = (. . R).
1∙4/cosa2, N 35 1 2 .
2 4 . , ( ), . , . .
, , N 34. , 2-4 3-5. , = d = 3 , N 34 r 2 = 3 d∙ sina2.
= 1 .
S m = 0, R ∙ - N 34∙ r 2= 0.
. . N 34 = (. . R) = (. . R) = (. . R).
, 1/3sina2. 4 (2/9sina2) .
= 1 .
S m = 0, R ∙7 d + N 34∙ r 2= 0.
. . N 34 = (. . R) = (. . R).
, 7/3sina2. 1/6 7/3sina2.
. , .
|
|
N 45 ( ) . , 4 (. 2.10) S = 0 N 45. N 34 . 4 .
S = 0. N 34sina2 + N 45 = 0. N 45 = - N 34sina2,
. . N 45 = - (. . N 34)∙sina2
4, , . . 1 2 , 6 12 . .
4 (. 2.11).
S = 0. N 34sina2 + N 45 = 0. N 45 = - N 34sina2 + 1 = - sina2 + 1 = .
4 7/9 . N 45. N 45.
6-7 6-7 . , 5 9 6-7 . 6-7 , ( 1 5 ) ( 9 12 ) N 67 . , = 1 7 (. 2. 12).
S = 0. N 67 = 0.. N 67 = 1.
1 7 , N 67 (. . 2.9).
3
, , , , . . , , .
.
. . 3.1.
. , , (. 3.1). (. 3.2, , ). , . 3.2, , .
, , (. 3.2, ). .