, ( ) . ( . ). . ³ .
. , . . . . .
˳: [3], 2333, 4245; [6], 1634; [], 2565; [12], 2266; [15], 2650.
, ( ) , .
, , , . , , , .
() , . , , ' , , , . , , , () , .
, : /2 /2, /2 /2, . ., , ., . ., . () (). Ѳ /2, .
- . , 䳺 , - , .
(, , ) , , . 䳿 (, , , .), (, , ), , .
, , , ' .
1. , , - ; 1=240 , 2 = 300 .
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, 00. - , 1 2
1= 2
³
1 = + g1, 2 = + g2
, + g1= + g2
2. , : 1 = 100 , 2=150 , 3=10 .
, , 0= 0.
1
1 = + g1 =800 9,81 0,1=785 /2.
2
2 = + g2 = 785 + 1000 9,81 0,15 = 2260 /2.
3
= 3 + g3 = 2260 + 13600 9,81 0,01 =3590 /2.
³ ( ) ' . .
3. G (), , =200 .
=500 , b =450 ; : D = 480 , d = 40 .
³ , ,
³ , . ,
1. ?
2. , ?
3. ?
4. ? ?
5. .
6. ? U- , .
7. , .
8. ? , , : ) , ) ?
9. (/2) , U- =301 , = 1 .
³: =137 /2.
10. (), , , 1 = 960 , , , 2 = 760 . . ٳ , =1,2 /3.
³: = 465 .
3. в Ҳ. ղ
. . . . . . .
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˳: [3], 3342; [6], 3448; [11], 6681; [12], 6677; [15], 51 64.
ϳ : . , .
, , , . ( ) ( ), .
, . : , , , , , , . () () .
. 1. m () , = 5 , h = 3 , b = 2 , , , l = 3 . . , .
Q, , :
= ghcF ;
DO = h =h ( h ) ;
F = b h = 2 3 = 6 2 - ;
hc = h/2 = 5 - 3/2 = 3.5 - ;
h = hc + I0/hc F - ( D ); ;
I0 = bh3/12 = 233/12 = 4,5 4 - , .
h = 3,5 + 4,5/(3,56) = 3,71
DO = 3,71- (5 3)= 1,71
= 1000 9,81 3,5 6 = 206 103 ;
Q = 206 103 1.71 / 3 = 128 103 ,
m = Q / g = 128 103 / 9.81 = 12000
2. Q (), , , m = 500 , R = 40 , =1 . ³ 0,715.
䳺 , :
z ( R)
, , =' " = 0, , = z..
z =
( ) R R (. ),
V=V - ½V=
ٳ =0,7151000 = 715 /3.
z = 715 9,81 4,9 10-3 = 34,3 .
:
2 G + Q = 0, G = mg = 0,5 9,81 = 4,9 .
Q= z +G=34,3 + 4,9 = 39,2 .
3. , , : L = 4 , = 2 , = 0,7 m0= 800 , . :
) ( ) h' ();
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) m () = 200 .
) , , 䳺 G ', ,
- G0 + ' = 0 ' = G0 = mg.
³
P/ =
) 䳺 Q G ", ,
Q G0 + " = 0, Q = P" G0.
³
"=
Q = 39200 8009.81=31.3103
1. ?
2. ? ?
3. ?
4. ?
5. .
6. () ; h = 2 b = 3 , h (), = 5 .
³ = 235 , h = 4,08 .
7. () , 䳿 , =10 , R = 2 , = 2
³: = 366 , = 5730'.
8. h (), F = 7 2, t = 0,4 , m= 70 , =0,9.
³: h = 30 .
4. ʲ в
. . . . ʳ . ̳ , . г .
˳: [3], 5054; 6874; [6], 4951, 5659, 7982; [11], 8291; [12], 8293; [15], 6987; 9133.
, . : (' ) .
: . , .. .
, .
( , , ), .
, ' (3/) (/). ' .
' , , , .
1. .
2. ?
3. . .
4. , .
5. () ?
6. , , .
7. , , ?
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8. .
9. ?
10.
d1 = 100 ,
d 2 =125 d3 = 75 ,
Q== 50 3/.
³: v1 = 1,78/,v2= 1,13/, v3=3,14/.