HP 35s Instruction Manual page 3

General applications – part 2

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HP 35s General applications – Part 2

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:

In algebraic mode:

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

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:

In algebraic mode:

Answer:

The time until maximum is just under 36 minutes.

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200,500,Ù220,Ù,

,,200ÕÙ,500ÕÙ,220Ï

1/3

) )

2Ë1Ï800Ï

0Ë25Ï0Ë8º=¸¯3¹'¸

2Ë1¸¹'3Õ800¯

40Ë25¸º=0Ë8Ï

- 3 -

Figure 2

Figure 3

HP 35s General applications Part 2- Version 1.0