hp calculators
HP 30S Using the Built-in Physical Constants
Since it occurs twice in the pressure equation, we’ll calculate this value first and use the ANS function
to retrieve V. Press:
.2qx7/4u3y
and now we can calculate P by pressing:
š<<<*223/r—$-3.95ut5s-
.1474/—$qy
Answer:
7229306.314 Pa or 72.3 bar.
Example 5: Find the revolution period of an artificial satellite put into circular orbit around the Earth. The radius of the
orbit is 8000 km.
Solution:
The period is given by:
GM
R
T
3
2
π
=
where R is the radius of the orbit, M is the mass of the Earth ( 5.98·10
24
kg) and G is the gravitational
constant. (Note that it does not depend on the mass of the satellite). The period can be calculated as
follows:
2xp8u6—U3/rš@@y*5.98u24
y
Answer:
7117.110266 s or 2 hours approximately.
hp calculators
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HP 30S Using the Built-in Physical Constants - Version 1.0
