14 The HP 15c: A Problem Solver
The time an object takes to fall to the ground (ignoring air friction) is
given by the formula
t =
2h
g
,
where t = time in seconds,
h = height in meters,
g = the acceleration due to
gravity, 9.8 m/s
2
.
Example: Compute the time taken by a
stone falling from the top of the Eiffel
Tower (300.51 meters high) to the earth.
Keystrokes Display
300.51 v
300.5100
Enter h.
2 *
601.0200
Calculates 2h.
9.8 ÷
61.3286
(2h) / g.
¤
7.8313
Falling time, seconds.
Programmed Solutions
Suppose you wanted to calculate falling times from various heights. The
easiest way is to write a program to cover all the constant parts of a
calculation and provide for entry of variable data.
Writing the Program. The program is similar to the keystroke sequence
you used above. A label is useful to define the beginning of a program,
and a return is useful to mark the end of a program. Also, the program
must accommodate the entry of new data.
Loading the Program. You can load a program for the above problem by
pressing the following keys in sequence. (The display shows information
which you can ignore for now, though it will be useful later.)
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