HP 25

Function Keys 65
Press
Display
I 5.00 I
I 0.33 I Reciprocalof3.
:= 1 = 1. = 71 ======i
1
Cube root of 5.
Example: An aircra ft pilot reads a pressure altitude (PA L T)of
25 ,500 feet with a calibrated airspeed (CAS) of 350 knots. What
is the flight mach number
speed
of aircraft
M = ---:-----,,---,-
speed of sound
if the following formula
is applicable?
M=
Method: The most efficient place to begin work on this problem
is at the innermost set of brackets. So begin by solving for the
quantity
t 6!~~5 j 2 and proceed outward from there.
Press Display
350mmiD 661.5 B := 1 0 = .5 o= 3 === ~1
iii [£] I 0.28 I Squ a r ~ of bracketed
quantIty .
11.06 I
. 201 EJ
3.5 0 0 1
EJ
I 0.21 I Contents ofleft-hand set
'--"'=-=- -- - ---' of brackets are in
the stack.
I mmiD 6.875 _I 6.875 00 I
ram 6 mmiD I 6. 8750000 -06 I
255000 EJ I 0.82 I
5.2656 Eml 0 0 1:= 2 ~ . ~ 76 ~ =====i1 Contents of right-hand
s
et of brackets are in
the stack.
01EJ rl- 1.5 - 8 -- ----~ 1
.286 0 1EJ I 0.14 I
50 0 ~ 1 0.84 I Ma chnumberoftheflight.