20
20.1. . , . .
20.2
20.2. n = 5 c-1. Δ t = 1 . N, .
20.3. ?
20.4. 
. . ?
20.5. , L = 0,4 , = 5 , m = 20 , V 1 = 1000 /. , , V 2 = 500 /. ?
21
21.1. 
. .1 
(
- , - 
). .2 , . 
, ...
21.2., ε = 2 /2, t 2 = 5 75 . t 1 , ( t = 0) .
21.3. 
, . 
, . , . ?
21.4 m, k, ( ). ? .
21.5. m = 0.3 R = 0.5 , 1200 , , . , 200 , ,
22
22.1. : 
= 2 t 
+ (2 + 3 t 2) 
. 
t = 3 . ?
|
|
|
22.2. 
ω , , t. , φ t , 
.
22.3. , , . t = 6 , ?
22.4. 
, 
. 
, , 
:
1) 
2) 
3) 
4)
.
22.5. v=7.2 /., ( ), , . 
.
