Using mathematical functions
179
Units and physical constants
When you press
b
, three menus become available:
•
the Math Functions menu (which appears by default)
•
the Units menu
•
the Physical Constants menu
The math functions menu is described extensively earlier
in this chapter.
Units
You can attach physical units to any numerical calculation
or result. A numerical value with units attached is referred
to as a measurement. You can operate on measurements
just as you do on numbers without units attached, except
that the units are carried along with the operations. The
function usimplify (unit simplify) will simplify the results
back to the simplest unit structure. The units are found in
the Units menu. Like the Math menu, the Units menu is
divided into a set of categories on the left and units in
each category on the right. The categories are:
Unit categories
Suppose you wish to add 20 centimeters and 5 inches.
1. If you want the result in
cm, start by entering the
20 cm.
20
b
\\
(to select
Length
)
>\
(to select
_cm
)
.
•
Length
•
Area
•
Volume
•
Time
•
Speed
•
Mass
•
Acceleration
•
Force
•
Energy
•
Power
•
Pressure
•
Temperature
•
Electricity
•
Light
•
Angle
•
Viscosity
•
Radiation
Summary of Contents for 39gII
Page 1: ...HP 39gII graphing calculator user s guide Edition1 Part Number NW249 90001 ...
Page 2: ...Printing History Edition 1 November 201 1 ...
Page 32: ...22 Getting started ...
Page 58: ...48 Apps and their views ...
Page 70: ...60 Function app ...
Page 80: ...70 Solve app ...
Page 136: ...126 Polar app ...
Page 140: ...130 Sequence app ...
Page 148: ...138 Finance app ...
Page 152: ...142 Linear Solver app ...
Page 218: ...208 Matrices ...
Page 226: ...216 Notes and Info ...
Page 238: ...228 Variables and memory management ...
Page 318: ...308 Programming ...
Page 340: ...330 Reference information ...
Page 346: ...vi Product Regulatory Information ...