Preview of constants and measurement units – Texas Instruments PLUS TI-89 User Manual
Page 99
82 Chapter 4: Constants and Measurement Units
04UNITS DOC TI-89/92Plus: Constants and Measurement Units (English) Susan Gullord Revised: 02/23/01 10:54 AM Printed: 02/23/01 2:12 PM Page 82 of 12
Steps
³
TI
-
89
Keystrokes
›
TI
-
92 Plus
Keystrokes
Display
1. Display
the
MODE
dialog box,
Page 3
. For
Unit System
mode,
select
SI
for the metric system of
measurements.
Results are displayed according to
these default units.
3 … B 1
¸
3 … B 1
¸
2. Create an acceleration unit for
meters/second
2
named _ms2.
The UNITS dialog box lets you select
units from an alphabetical list of
categories. You can use
2 D
and
2 C
to scroll one page at a time
through the categories.
Now, instead of re-entering _m/_s
ñ
each time you need it, you can use
_ms2
.
Also, you can now use the UNITS
dialog box to select _ms2 from the
Acceleration
category.
2 9 D B M
¸
e 2 9
D D D B S
¸
Z 2 §
¥
2 ™ M S
j 2 ¸
¥ 9 D B M
¸
e ¥ 9
D D D B S
¸
Z 2 §
2
M S
2 ¸
3. Calculate the force when
m = 5 kilograms (_kg) and
a = 20 meters/second
2
(_ms2).
If you know the abbreviation for a
unit, you can type it from the
keyboard.
5 ¥
2 ™ K G
j p 2 0
¥ 2 ™
M S j 2
¸
5 2
K G
p 2 0
2
M S 2
¸
4. Using the same m, calculate the
force for an acceleration due to
gravity (the constant _g).
For
_g
, you can use the pre-defined
constant available from the UNITS
dialog box or you can type _g.
5 ¥
2 ™ K G
j p
2 9 B
j G
¸ ¸
5 2
K G
p
¥ 9 B
G
¸ ¸
5. Convert to kilograms of force
(_kgf).
2
displays the
4
conversion
operator.
B 2 ¥
2 ™ K G F
j ¸
B 2 2
K G F
¸
Preview of Constants and Measurement Units
Using the equation f = m
ù
a, calculate the force when m = 5 kilograms and a = 20
meters/second
ñ
. What is the force when a = 9.8 meters/second
ñ
. (This is the
acceleration due to gravity, which is a constant named _g). Convert the result from
newtons to kilograms of force.
If you use the UNITS
dialog box to select a
unit, the _ is entered
automatically.