# A Second Example Of Mohr's Circle Calculations - HP 50g User Manual

Graphing calculator.

necessary to plot the circle. It is suggest that we re-order the variables in the
sub-directory, so that the programs @MOHRC and @PRNST are the two first variables
in the soft-menu key labels. This can be accomplished by creating the list {
MOHRCIRCL PRNST } using: J„ä@MOHRC @PRNST `
And then, ordering the list by using:
After this call to the function ORDER is performed, press J. You will now see
that we have the programs MOHRCIRCL and PRNST being the first two
variables in the menu, as we expected.

## A second example of Mohr's circle calculations

Determine the principal stresses for the stress state defined by
= -6.25 kPa, and
yy
the figure the values of
To determine the principal stresses use the program @PRNST, as follows:
J@PRNST
12.5˜
6.25\˜
5\`
The result is:
To draw Mohr's circle, use the program @MOHRC, as follows:
J@MOHRC
12.5˜
6.25\˜
5\`
The result is:
= - 5.0 kPa. Draw Mohr's circle, and determine from
xy
'
, '
, and '
xx
yy
„°@) @ MEM@@ @) @ DIR@@ @ORDER.
if the angle
xy
Start program PRNST
Enter x = 12.5
Enter y = -6.25
Enter xy = -5, and finish data entry.
Start program PRNST
Enter x = 12.5
Enter y = -6.25
Enter xy = -5, and finish data entry.
= 12.5 kPa,
xx
o
= 35
.
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