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HP -28S Manual Page 146

Advanced scientific calculator.
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A unit string can also represent a quotient of units, such as "m/sec".
However, the / symbol can't appear more than once. Be sure to group
all direct units before the / symbol and all inverse units after the /
symbol. For example, "feet per second per second" is represented by
"ft/sA2".
For the next example, convert 1 mile per hour to feet per second.
Clear the stack and enter the numerical value .
1
CLEAR
I
1
1
ENTER
I
Enter the unit for "miles per hour."
~----------------------~
[IT]
mph
1
ENTER
I
3:
2:
1
1:
'mph'
IiiDlIiBIIlDllrnaEBDlID
Key in the unit for "feet per second."
There is no built-in unit for "feet per second," so you'll use a unit
string .
~
[IT]
ft
IT] s
2:
1 :
1
'mph'
"ft /
51
IiiDlIiBIIlDllrnaEBDlID
Alpha entry mode was activated (as indicated by the form of the
cursor) when you began keying in the string. In alpha mode all com-
mands are written to the command line, so you'll need to press
1
ENTER
I
to complete the string.
1
ENTER
I
3:
1
2:
'mph'
1:
"ft /
5"
IiiDlIiBIIlDllrnaEBDlID
Convert the numerical value from the old units to the new units.
. 1
CONVERT
I
3:
2:
1.46666666667
1:
"ft /
5"
IiiDlIiBIIlDllrnaEBDlID
The result shows that 1 mile per hour converts to 1.46666666667 feet
per second.
14: Unit Conversion
145

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