̲Ͳ ²
1 .
. . . .
-
1 . . . . . - ./ : . . , .., ...: , 2010. 66 .
: . . , . .
.., .
.., .
: . . , , . .. .
2 25 2010
- . . .
() ᒺ 20 . . , . . . . ³, .
( ) , . .
. 15. 5 , 5 5 .
Ͳ
ʳ
= f(t), - - , , , (.1.1).
z S
A D
B
O x
y
1.1
= x + y + z , , , - (); x, y, z .
D = 2 - 1 - Dt ( - , , , , ).
, - .
S , , .
= D /Dt .
|
|
: = d /dt = Vx + Vy + Vz ,
Vx = dx/dt, Vx = dy/dt, Vz = dz/dt - V .
:
V =
:
V = S/(t2 - t1) = 1/(t2 - t1) .
= D /Dt ,
= d / dt = = d2 / dt2 .
.
= V . , V , = . + V . , :
= . - ,
= V . = (V2 / R.) - ,
R ,
- , , .
= + = V2 / R . + . - .
|a| = - .