5-44 Equation Reference
Circle (11, 1)
Equations:
A π r
2
⋅=
C2π r⋅⋅=
I
π r
4
⋅
4
------------
=
J
π r
4
⋅
2
------------
=
Id I A+d
2
⋅=
Example:
Given: r=5_cm, d=1.5_cm.
Solution: C=31.4159_cm, A=78.5398_cm^2, I=4908738.5_mm^4, J=9817477.0_mm^4,
Id=6675884.4_mm^4.
Ellipse (11, 2)
Equations:
A π bh⋅⋅=
C2π
b
2
h
2
+
2
-----------------⋅⋅=
I
π bh
3
⋅⋅
4
--------------------
=
J
π bh⋅⋅
4
------------------
b
2
h
2
+()⋅=IdIA+d
2
⋅=
Equations: Example:
Given: b=17.85_
µm, h=78.9725_µin, d=.00000012_ft.
Solution: A=1.1249E–6_cm^2, C=7.9805E–3_cm, I=1.1315E–10_mm^4, J=9.0733E–9_mm^4,
Id=1.1330E–10_mm^4.
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General
Weight and Dimensions
