Chapter P: P Pyramid, Regular

P

phosphorus (element)

Pa

protactinium (element)

PARABOLA

cross-section of a cone taken through a plane below the cone vertex and parallel to the side of the cone, where

a	= FV = VC
d	= distance from point F to any point b
=	perpendicular distance from DD to point b
DD	= directrix, parallel to EE
EE	= latus rectum = 4 FV
F	= focus
FC	= perpendicular to DD
FC	= FE
V	= vertex

curve equation,

PARABOLA SECTION

where

h, L, x, y	= dimensions, in.
A	= cross-sectional area, in. 2
cg	= center of gravity
I AA, I BB, I CC, I DD	= moment of inertia, in. 4
k AA, k BB, k CC, k DD	= radius of gyration, in.
s	= arc length, in.

• arc length,

  

• area,

  

• center of gravity,

  

• moment of inertia,

  
  

• radius of gyration,

  

PARALLELOGRAM

four-sided figure with opposite sides parallel and equal.

• area,

  
  

• center of gravity (cg), at intersection of diagonals

part/million =

35.3147 g/ft 3	1 g/m 3
0.0001 g/l	0.437 gr/ft 3
0.0584 gr/gal	6.243 E ? 05 lb/ft 3
0.07015 gr/gal (Imperial)	1 mg/l

pascal =

9.869 E ? 06 atm	0.10197 kg/m 2
1 E ? 05 bar	0.001 kPa
10 baryes	0.02088 lb/ft 2
7.500 E ? 04 cm (mercury, 0 C, 32 F)	1.45 E ? 04 lb/in. 2
10 dyn/cm 2	0.0075 mm (mercury,...