EasyManua.ls Logo

HP HP-21 - Page 51

HP HP-21
74 pages
Print Icon
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Loading...
Function
Keys
49
B
(oc]
is
log,,
(common
log);
computes
log
of
value
in
X-register
to
base
10.
I
(]
is
antilog,,
(common
antilog);
raises
10
to
the
power
of
value
in
X-register.
Example
1:
The
1906
San
Francisco
earthquake,
with
a
magni-
tude
of
8.25
on
the
Richter
Scale
is
estimated
to
be
105
times
greater
than
the
Nicaragua
quake
of
1972.
What
would
be
the
magnitude
of
the
latter
on
the
Richter
Scale?
The
equation
is
M
105
R,
=
R,
—
log
M?=
8.25
—
(log
—1)
Solution:
Press
Display
8.25
105
I
(5c)
(-]
Rating
on
Richter
Scale.
Example
2:
Having
lost
most
of
his
equipment
in
a
blinding
snowstorm,
ace
explorer
Buford
Eugobanks
is
using
an
ordi-
nary
barometer
as
an
altimeter.
After
measuring
the
sea
level
pressure
(30
inches
of
mercury)
he
climbs
until
the
barometer
indicates
9.4
inches
of
mercury.
Although
the
exact
relation-
ship
of
pressure
and
altitude
is
a
function
of
many
factors,
Eugo-
banks
knows
that
an
approximation
is
given
by
the
formula:
)
30
Altitude
(feet)
=
25,000
In
=
25,000
In
54
Pressure
Where
is
Buford
Eugobanks?
Solution:
Press
Display
25000
30
9.4
[]
;e
[x]
Feet
altitude.
Eugobanks
is
probably
near
the
summit
of
Mount
Everest
(29,028
ft.)

Table of Contents

Related product manuals