) .
| I=mR2
v=ωR m
|
) () .
| , I = mR2 , , E=mv2/2 |
)
| dI = dm∙r2 ( ). $l$, $m$, , dm = m∙ dV/V, dV - , V - . |
dS - ()
, , 2πR
dr.
(4)
, , .
, , , , a
. :
) .
| dm = m∙ dr/R, dI = r2∙dm = =r2∙m∙dr/R.
|
) , , .
, .
K - , , (, ), v - .
.
, u = v,
K = 1 ,
K = 1/2 ,
K = 2/5 .
.
|
 (5)
2 - K v. K, .
|
.
.
=-R+R cosα =H-R(1-cosα) v∙ sinα.
x=b-R∙sinα co c v∙cosα t=x/(v∙cosα).
t =v∙sinα∙ t+gt2/2,
v (5), K
(6)
R<< H R<< b (6 ) =, x=b.
|
|
|
α<<1 K=4hH/b2-1.
1. h , cosα tgα.
2. , .
3. , b, , x.
4. K , K. . .
.
1. , , . ?
?
2. (5) .
? ,
?
| 3. , . ? , R* ? |
? K ?
, ?
4. ,
.
e ? ?
, ,
(1), (2), (3), (4), (5), (6) (1'),
8.
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