>> 10 .

5.

 


47.

, , , , , . .

1. 1 60 4 /. . .

. (. 5.16). 1 :

hmax . υx = υ0 cosα.

2: 2 = 2 + 2 = (mυ20cos2α)/2 + mghmax.

, , , , , :

hm:

2. Δl = 10 . , Δl0 = 1 F0 = 2 .

. : Δl0 = 0,01 , Δl = 0,1 . . F0 = kΔl0 : k = F0/Δl0. :

, , A = -1 .

3. l . , , 2 , ?

. m, (. 5.17). .

m = + m.

OY (. . 5.17): - mg = m, = υ2/l. , = 2mg, mg = m, υ2 = gl.

h , , 2 . 1 = mgh, h . 2 = mυ2/2.

2/2 = mgh, υ2 = 2gh. , υ2 = gl, 2gh = gl, h = 1/2.

4. m1 m2 . υ1 υ2 .

.

m11 + m22 = m1 + m22,                     (1)

1 2 .

(1) X (. 5.18) (, ):

m1υ1 - m2υ2 = - m1u1 + m2u2.                     (2)

:

m1υ21/2 + m2υ22/2 = m1u21/2 + m2u22/2.                     (3)

(2) (3) u1 u2. , m1, , m2, : m11 + u1) = m22 + u2), m121 - u21) = m2(u22 - υ22).

, u1 ≠ - υ1 u2 ≠ - υ2, . , υ1 u1 = υ2 - u2, u2 = υ1 + υ2 - u1.

u2 (2), u1:

m1υ1 - m2υ2 = -m1u1 + m2υ1 + m2υ2 - m2u1.

1. , , , 3 , 100 5 .

2. 97 . 30. 0,2. 100 .

3. 20 000 , 10 ? , 1 10 000 . .

4. , 1 , , , 20 2 . ?

1. 100 1 . 90 . , 60?

2. m1 = 600 , 2 /, m2 = 200 . ? .


5

1. .

2. .

3. .

4. , .

    1. . .

    2. ( , ).

,

 

 

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