, ∆F, , . (1 = 1 /2).
, , .
,
(F = P = mg), , ,
, , , , ,
( ) .
.
, . h
=ρhg
, .
. .
, :
- =0+ρgh, 0 ;
- .
, ( ) , , .
: . , , (.)
, , .
( , , ). , , .
, , , , .
, . . , , .
, , . . . ( ).
==ρgh
, 760 0, .
=760 .. ≈105=1 (1.. ≈ 133,3 ).
|
|
, : 11 1 . ( 1 ).
. .
, , , . () . .
: ()
FA =mg=ρVg
V ( ); ρ- .
FA =0-, 0 ; - .
() | ||||
mg > FA | mg < FA | mg = FA | mg = FA | |
ρ > ρ | ρ < ρ | ρ = ρ | ρ < ρ |