>> 10 .

4.

 


39.

, , .

:

m11 + m22 + ... = m11 + m22 + ..., 1, 2 . . , 1, 2 . . .

. . , , , .

.

1. , m1 = 0,5 m2 = 0,2 , υ1 = 1 / υ2 = 4 /. v .


, .

. , 1.

. ( ), ( ):

m1υ1x + m2υ2x = (m1 + m2x.

υ1x = υ1, a υ2x = -υ2,

υx = (m1υ1 - m2υ2)/(m1 + m2) ≈ -0,4 /.

0,4 /.

2. , m2/m1 = 4, (. 4.3, ). , 3 (υ1 = 3υ2), . .

. 1 2 , .

m11 + m22 = (m1 + m2).

OY, , 4.3:

m1υ1x + m2υ2x = (m1 + m2),
m2υ1y + m2υ2y = (m1 + m2).

υ1x = υ1, υ2x = 0, υ1y = 0, υ2y = υ2y = υ2,

, υ2 = , , υ1 = 3.

. 1 2 , (m1υ2)2 + (m2 + m2)2 = (m1 + m2)22.

, , υ1 = 3.

3. υ1 = 200 /, υ2 = 500 /.

.

. Δm Δt

Δmυ2 - Δmυ1 = FΔt.

, , ,

,    ,

, , , , . . = -p. ,

1. 2 104 3 104 . 1 /. ?

2. 100 , 1 /, , 50 1,5 / . .

3. , ?

4. . , 70 , 35 320 /. 60.

  
       ?

C1. m1 = 4 60 10 / , (. .). ?

C2. , , . 90 50 /, 30 100 /. .

C3. , , 200 /, , , , 50 /. 15 . , , , 10 .

C4. 400 /. , . , 2 , 80 . .


4

1. .

2. .

3. .

4. , .

    1. , . .

    2. .

    3. . .

    4. .

. . . ( )

 

 

@Mail.ru