1.
. 2 v 0, v 0. 2 v 0, v 0. ?
(10 )
S , t1 (t2) () . S t1 =  . : S =    .
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, :
( , );
, , :
t1 =  .
S =
, :
t1 
.
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2.
1 . t1 = +100 2 , t2 = -50. , c = 4,2 /(∙C), c = 2,1 /(∙C), λ = 340 /. .
(10 )
m , m . t0 = 00. t1 = +100 Q1 = ml + (m + m)(t1 - t0). t1 = -50 Q2 = ml - (m + m)(t2 - t0).
Q1 = 2Q2  m + m = 1 , m = 647 , m = 353 .
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| , : ( , ); : ( ); Q1 = ml + (m + m)(t1 - t0) Q2 = ml - (m + m)(t2 - t0); , ; m = 647 m = 353 . |
3.
S = 20 2 . m = 160 , . Dh . ρ = 800 /3, ρ = 1000 /3.
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(10 )
h , h , . ρgh = ρgh, h  . m = ρhS  . Dh = h - h = h (1 -  ) = 
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, :
( , );
, , :
ρgh = ρgh
, :
h = 
h = 2 .
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4.
, , R = 10 , U. , 25% .
(10 )
I1 =  I2 =  , . 25%, I2 = nI1, n = 1,25. I2 I1,  .
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, :
;
( , ):
I1 =  ;
I2 =  ;
, ;
RA = 5 O
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5.
, v 0 = 72 /, t0 = 10 . , S v .
(10 )
. t0, v = v 0 - t0 = 0, =  S =  = 100 . t1 =  S1 =  . 
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, :
;
:
;
;
;
, ;
;
S = 100
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