Rambler's Top100





N (N 1)
k
= Nk,
m
= M/N l
= L/N. n
F
n
= nm
g = nMg/N
l
n
= l
+
F
n
k
=
L
N
+
nMg
kN
2
.
n
h
n
=
n
i=1
l
i
=
n
i=1
L
N
+
iMg
kN
2
=
Ln
N
+
n(n +1)
2
Mg
kN
2
.
E =
N
n=1
m
gh
n
=
Mg
N
L
N
N
n=1
n +
Mg
2kN
2
N
n=1
n(n +1)
=
Mg
N
L
N
N(N +1)
2
+
Mg
2kN
2
N(N +1)(N +2)
3
. N 1,
E =
MgL
2
+
(Mg)
2
6k
.
n Δl
n
=(l
n
l
)=
nMg
kN
2
.
E =
N
n=1
k
l
n
)
2
2
=
(Mg)
2
2kN
3
N
n=1
n
2
=
(Mg)
2
2kN
3
N(N + 1)(2N +1)
6
.
N 1, E =
(Mg)
2
6k
.
A = E +E =
MgL
2
+
(Mg)
2
3k
= MgL
1
2
+
Mg
3kL
.
m h = l(1 cos α).
mgh =
1
2
mv
2
m
v =
2gl(1 cos α).
mv =(m + M)u
u = mv/(m + M).
1
2
(m + M)u
2
=(m + M)gH
H =
u
2
2g
=
m
2
v
2
2g(m + M)
2
=
m
m + M
2
l(1 cos α).
Q =
1
2
mv
2
1
2
(m + M)u
2
=
mgh (m + M)gH =
mM
m + M
gl(1 cos α).