HP 35s Instruction Manual page 2

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HP 35s General applications – Part 1
General applications
This training aid will illustrate the application of the HP 35s calculator to several problems in other areas. These
examples are far from exhaustive, but do indicate the incredible flexibility of the HP 35s calculator.
Practice solving problems
Application 1: Shape Factor
Example 1: What is the shape factor for heat transfer by radiation between two parallel disks 2 feet apart? The radii of
the disks are 1.5 feet and 3.5 feet.
Solution: While the formula to solve this problem is not particularly complicated, it does involve a good amount of
repetitive calculation, making it a very good candidate for the Equation Mode on the HP 35s. In the formula
below, a is the radius of the first disk, b is the radius of the second disk, and L is the distance between the
disks.
=
F
2
d1¯42¸º=hAÕÕ¸
4º=hLÕÙº=hAÕÙº=hBÕÃ
?º=º=hLÕÙº=hAÕÙº=hBÕÕ
Ã4¸º=hAÕ¸º=hBÏ
With the equation showing on the bottom line of the screen, press Ï
1Ë5¥
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1
+ +
2 2
[ L a b
2
a
− + +
2 2 2
( L a
- 2 -
−
2 2 2
b ) 4 a * b
Figure 1
Figure 2
Figure 3
HP 35s General applications Part 1- Version 1.0
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