:
M=450
=0,85
:
1 .
, :
450(9,81 +2) =5310 ; = 5310
2 . . .
;
3 . , . : ,
() , v = 0.
;
:
4 - . .
;
5 - . , . : ,
() , v = 0
= 5310
3.
.
4. ,
5
,
:
1) N σ, N σ ;
2) δ , = 2·10 .
, .
: F = 2 kH, F = 5 kH, F = 2 kH, A = 2 , , l = 100 , l = 50 , l = 200 ,
l = 150 .
. :
N = 0
N = F = 2 kH;
N = F - F = -3 kH;
N = F - F - F = - 5 kH
:
σ 1= N1:1=0
σ 2= N2:1= 1
σ 3=N3:2 = -0,75
σ 4=N4: A2 = -1.25
, :
1. , -
2.
3. .
4. .
5. . σ =
7. - ,
|
|
8. ,
9. .
10. . ( ), . , .