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Questions and Answers
Which of the following mathematical expressions represents a linear function?
Which of the following mathematical expressions represents a linear function?
What property does a variable expression exhibit if it contains both positive and negative terms?
What property does a variable expression exhibit if it contains both positive and negative terms?
What is the primary characteristic of a quadratic equation?
What is the primary characteristic of a quadratic equation?
Which of the following describes the graph of an exponential function?
Which of the following describes the graph of an exponential function?
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Which type of equation can be solved using factoring methods?
Which type of equation can be solved using factoring methods?
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Study Notes
Pressure and Heads
- Pressure is the measurement of force of water on a surface area, usually 1 square inch.
- Head is the height or column of water.
- PSI (Pounds per square inch) is a unit of pressure.
- PSI(A) (Pounds per square inch absolute) measures actual weight, including atmospheric pressure.
- PSI(G) (Pounds per square inch gauge) measures actual gauge pressure only.
- 1 cubic foot of water weighs 62.5 pounds.
- 1 cubic foot of water is equal to 6.25 imperial gallons.
- 1 gallon of water weighs 10 pounds.
- 1 PSI = 2.31 feet of water
- 1 inch of water column = 0.036 PSI
Unit Pressure
- Rule 1: PSI = head in feet x 0.434 PSI
- Rule 2: Head in feet = PSI x 2.31'
Total Force for Vertical Pipes
- Total Force = Area in square inches x pressure
- Total Force = (πR²) x PSI
Total Force for Tanks with Vertical Walls
- Total Force = Volume in cu.ft. x weight of 1 cubic foot of water
- Total Force = Length x width x height x 62.5
Review Questions
- Examples of converting PSI to feet or head to PSI are shown in the provided text.
- Converting feet of head to pressure.
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Description
This quiz covers the principles of pressure and heads in fluid mechanics, including the calculation of PSI and the total force for vertical pipes and tanks. Understand how pressure is measured and the relation between pressure and the height of water columns. Test your knowledge with review questions based on these concepts.
