Chapter_14

# Chapter_14 - Chapter 14 Fluid mechanics Reading assignment...

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Fluids flow. Fluids are a collection of randomly arranged molecules held together by weak cohesive forces. This is unlike crystals (solids) which arrange orderly on a lattice) Pressure, Pascal’s law Buoyant forces and Archimedes Principle Continuity equation Bernoulli’s equation Chapter 14: Fluid mechanics Reading assignment: Chapter14.1 -14.6 Homework : QQ1, OQ1, OQ2, OQ6, OQ7, AE5, 1, 5, 8, 9, 11, 22, 23, 24, 27, 39 Due date:Tuesday, April 19

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Pressure A F P F… force A… area Unit of pressure: 1 Pascal; 1Pa = 1 N/m2
You hold a thumb tack between your index finger and thumb with a force of 10 N. The needle has a point that is 0.1mm in radius whereas the flat end has a radius of 5 mm. (a) What is the force experience by our finger; what is the force experienced by your thumb. (b) Your thumb holds the pointy end. What is the pressure on the thumb; what is the pressure on your finger. Black board example 14.1 Pressure

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In 1654, Otto von Guericke gave the citizens of Magdeburg a remarkable lesson in the force of the atmospheric pressure. He machined two hollow hemispheres, twenty inches in diameter (0.5m) so they fit snuggly into a sealed sphere. He pumped the air out of it. Then he put sixteen horses, eight on each side, to the task of pulling the halves apart. The horses hard a very hard time pulling them apart. If the atmospheric pressure is 1.0·105 Pa, what force would be required to pull the spheres apart?
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Chapter_14 - Chapter 14 Fluid mechanics Reading assignment...

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