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HP HP-25 - Page 69

HP HP-25
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Press
Display
s
EED
3@
Reciprocal
of
3.
B0
Cube
root
of
5.
Example:
An
aircraft
pilot
reads
a
pressure
altitude
(PALT)of
25,500
feet
with
a
calibrated
airspeed
(C
AS)
of
350
knots.
What
is
the
flight
mach
number
speed
of
aircraft
~
speed
of
sound
if
the
following
formula
is
applicable?
M=
‘/5
[(3
[(”0'2[%05]2
)
‘][‘
~(s875x10)
25,500]
>5‘2656§+
9"'“?
]
Method:
The
most
efficient
place
to
begin
work
on
this
problem
is
at
the
innermost
set
of
brackets.
So
begin
by
solving
for
the
350
quantity
|:TISJ
and
proceed
outward
from
there.
Press
Display
350
B
6615
]
B8
Square
of
bracketed
quantity.
21
4]
350N
Contents
of
left-hand
set
of
brackets
are
in
the
stack.
1
B
6.575
6
25500
5.2656
BN
Contents
of
right-hand
set
of
brackets
are
in
the
stack.
!
2860
1]
SE
L]
Mach
number
of
the
flight.

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