HP -25 Owner's Handbook Manual page 69

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=
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
350B 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.
!