Machinery's Handbook, 31st Edition
2874
Moment of Inertia Conversion Factors Units of Moment of Inertia and Momentum Table 57. Moment of Inertia Conversion Factors Multiply By To Obtain Moment of Inertia and Section Modulus
moment of inertia [kg•m 2 ] moment of inertia [kg•m 2 ] moment of inertia [lb•ft 2 ] moment of inertia [lb•inch 2 ] moment of section [foot 4 ] moment of section [inch 4 ] moment of section [meter 4 ] moment of section [centimeter 4 ]
23.73036
pound-foot 2 pound-inch 2
3417.171
0.04214011 0.0002926397 0.008630975
kilogram-meter 2 (kg•m 2 ) kilogram-meter 2 (kg•m 2 )
meter 4 (m 4 ) centimeter 4
41.62314
115.8618
foot 4 inch 4
0.02402510 0.02831685 0.00001638706
section modulus [foot 3 ] section modulus [inch 3 ] section modulus [meter 3 ] section modulus [meter 3 ]
meter 3 (m 3 ) meter 3 (m 3 )
35.31466
foot 3
61,023.76 inch 3 Table 58. Momentum Conversion Factors
Multiply
By
To Obtain
Momentum 7.233011 0.1382550 0.01152125
kilogram-meter/second kilogram-meter/second pound-foot/second pound-inch/second
pound-foot/second pound-inch/second
86.79614
kilogram-meter/second (kg•m/s) kilogram-meter/second (kg•m/s)
Miscellaneous Measuring Units
1 quire = 24 sheets 1 ream = 20 quires = 480 sheets 1 ream printing paper = 500 sheets 1 score = 20 units
1 great gross = 12 gross = 144 dozen 1 gross = 12 dozen = 144 units 1 dozen = 12 units
Ohm’s Law.— The following figure represents basic electrical relationships. This chart has been formatted in such a way that each variable has been related to the other three vari ables. This figure is simply for reference.
V 2 R ----
V R --
W V ---
I 2 R ×
I Amps V Volts Ohms R W Watts
W R --
Key to variables: V = Voltage (Volts) R = Resistance (Ohms) I = Current (Amps) W = Power (Watts)
V I ×
V 2 W ----
W R ×
W I ---
V I --
W I 2 ---
I R ×
Circular Model of Electrical Relations
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