hp calculators
HP 35s General applications – Part 2
hp calculators - 3 - HP 35s General applications Part 2- Version 1.0
Application 2: Electrical Engineering
Example 1: Three resistors of 200 ohms, 500 ohms and 220 ohms are in parallel. What is the equivalent resistance?
Solution: In RPN mode: 200,500,Ù220,Ù,
In algebraic mode: ,,200ÕÙ,500ÕÙ,220Ï
Figure 2
Answer: The equivalent resistance is 86.6 ohms
Application 3: Civil Engineering
Example 1: Runoff of rainfall from an area to an outlet will be at maximum when the water from the most remote point
contributes to the flow. What is that time if the slope is 0.25 per foot per foot, the rain intensity is 0.8 inches
per hour and the distance from the most remote area is 800 feet. Use a coefficient of 2.1 for grass.
The formula is: Time = C x ( D ÷ ( S x I 2) ) 1/3
Where C is the grass coefficient, D is the distance from the most remote area, S is the slope, and I is the
rainfall intensity.
Solution: In RPN mode: 2Ë1Ï800Ï
0Ë25Ï0Ë8º=¸¯3¹'¸
In algebraic mode: 2Ë1¸¹'3Õ800¯
40Ë25¸º=0Ë8Ï
Figure 3
Answer: The time until maximum is just under 36 minutes.
