MOMENTY BEZWŁADNOŚCI I DEWIACJI FIGUR PŁASKICH (przyjęto ρ=1) FIGURA
3
0
b ⋅ h 3
b ⋅ h I
y
=
I
=
x
3
x 0
12
3
b ⋅ h 3
b ⋅ h I =
I
=
y
x0
3
y 0
12
h
0*
2
2
b ⋅ h D
z
= 0
h/2
D =
0
z
x
4
b/2
b
3
0
b
y
⋅ h
3
b ⋅ h I =
I
=
x
12
x 0
36
3
b ⋅ h 3
b ⋅ h I =
I
=
y
h
12
y 0
36
x0
2
2
0*
b ⋅ h 2
2
b ⋅ h h/3
D =
D
= −
z
x
24
z 0
72
b/3
b
y=y0
4
⋅ R
4
⋅ R
I = π
I
= π
x
4
x 0
4
4
⋅ R
4
⋅ R
I = π
I
= π
y
4
y 0
4
D
D
x=x0
z
= 0
z = 0
0
0*
R
R
4
⋅ R
2
4
2
π ⋅ R
π ⋅ R 4 ⋅ R
I = π
I
x
=
−
⋅
y=y
x
0
0
8
8
2
3 ⋅π
4
⋅ R
4
I = π
⋅ R
y
I
= π
8
y 0
8
D
z
= 0
D
z
= 0
x
0
0
0*
4
R
/ 3 π
x
R
R
4
⋅ R
2
4
2
π ⋅ R
π ⋅ R 4 ⋅ R
y
I = π
I
x
=
−
⋅
x
16
0
16
4
3⋅π
y0
4
⋅ R
2
4
2
I = π
π ⋅ R
π ⋅ R 4 ⋅ R
y
I
y
=
−
⋅
16
0
16
4
3 ⋅π
4
R
x0
R
0*
D =
4
R
π ⋅ 2
R
4 ⋅ R 4 ⋅ R
4
R
/ π
3
z
8
D
z 0 =
−
⋅
⋅
x
8
4
3 ⋅π 3⋅π
R
3
y=y0
I = π ⋅ R
3
I
= π ⋅ R
x
x 0
3
I = π ⋅ R
3
I
= π ⋅ R
y
y 0
D
D
z
= 0
z = 0
0
x=x0
0*
R
R
3
π ⋅ R
2
3
0
π ⋅ R
2π ⋅ R 2 ⋅ R
I =
I
x
=
−
⋅
x
2
0
2
2
π
3
π ⋅ R
3
I =
π ⋅ R
y
I
=
x0
2
y 0
2
0*
D
z = 0
D
z
= 0
2
R π
/
0
x
R
R
3
π ⋅
2
3
π
R
π ⋅ R
2π ⋅ R 2 ⋅ R
I =
I
x
=
−
⋅
x
y
4
0
4
4
y0
π
3
π ⋅ R
2
3
I =
π ⋅ R
2π ⋅ R 2 ⋅ R
y
I
y
=
−
⋅
4
0
4
4
π
3
x0
R
0*
R
=
R 3
π
2 ⋅
2 ⋅
2 ⋅
D
R
R
R
z
D
0 =
−
⋅
⋅
2
R/π
2
z
2
4
π
π
x
R
0
I
I
x
= 0
x = 0
0
3
l
3
l
I =
I
=
y
y 0
x=x
3
12
0
0
D
D
z
= 0
z = 0
*
0
l