Chapter 13 Fluids. Copyright 2009 Pearson Education, Inc.
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1 Chapter 13 Fluids
2 13-7 Buoyancy and Archimedes Principle This is an object submerged in a fluid. There is a net force on the object because the pressures at the top and bottom of it are different. The buoyant force is found to be the upward force on the same volume of water:
3 13-7 Buoyancy and Archimedes Archimedes principle: Principle The buoyant force on an object immersed in a fluid is equal to the weight of the fluid displaced by that object.
4 13-7 Buoyancy and Archimedes Principle Example 13-10: Archimedes: Is the crown gold? When a crown of mass 14.7 kg is submerged in water, an accurate scale reads only 13.4 kg. Is the crown made of gold?
5 13-7 Buoyancy and Archimedes Principle If an object s density is less than that of water, there will be an upward net force on it, and it will rise until it is partially out of the water.
6 13-7 Buoyancy and Archimedes Principle For a floating object, the fraction that is submerged is given by the ratio of the object s density to that of the fluid.
7 13-8 Fluids in Motion; Flow Rate and the Equation of Continuity If the flow of a fluid is smooth, it is called streamline or laminar flow (a). Above a certain speed, the flow becomes turbulent (b). Turbulent flow has eddies; the viscosity of the fluid is much greater when eddies are present. (a) (b)
8 13-8 Fluids in Motion; Flow Rate and the Equation of Continuity We will deal with laminar flow. The mass flow rate is the mass that passes a given point per unit time. The flow rates at any two points must be equal, as long as no fluid is being added or taken away. This gives us the equation of continuity: Since then
9 13-8 Fluids in Motion; Flow Rate and the Equation of Continuity If the density doesn t change typical for liquids this simplifies to A 1 v 1 = A 2 v 2. Where the pipe is wider, the flow is slower.
10 13-9 Bernoulli s Equation Bernoulli s principle: Where the velocity of a fluid is high, the pressure is low, and where the velocity is low, the pressure is high. This makes sense, as a force is required to accelerate the fluid to a higher velocity.
11 13-9 Bernoulli s Equation Consider the work it takes to move a small volume of fluid from one point to another while its flow is laminar. Work must be done to accelerate the fluid, and also to increase its height. Conservation of energy gives Bernoulli s equation:
12 Example What gauge pressure is required at the end of the hose is necessary if a firehose is to spray water to a height of 18 m?
13 13-10 Applications of Bernoulli s Principle: Torricelli s Theorem & Airplanes Using Bernoulli s principle, we find that the speed of fluid coming from a spigot on an open tank is: or This is called Torricelli s theorem.
14 13-10 Applications of Bernoulli s Principle: Torricelli, Airplanes, Baseballs, TIA Lift on an airplane wing is due to the different air speeds and pressures on the two surfaces of the wing.
15 Example What is the lift (net upward force) due to Bernoulli s principle on a wing of area 88 m 2 if the air passes over the top at 280 m/s and under the bottom at 150 m/s?
16 Summary of Chapter 13 An object submerged partly or wholly in a fluid is buoyed up by a force equal to the weight of the fluid it displaces. Fluid flow can be laminar or turbulent. The product of the cross-sectional area and the speed is constant for horizontal flow. Where the velocity of a fluid is high, the pressure is low, and vice versa.
17 Group questions: 1. An ice cube floats in a glass of water filled to the brim. As the ice melts, will the glass overflow? No, level remains same 2. Why do airplanes normally take off into the wind? Increased lift if speed of air higher 3. Two ships moving along parallel paths close to each other risk colliding. Why? Water between forced to flow faster -> lower pressure than outside -> ships pushed together
18 More group questions: 4. You are originally 1.0 m beneath the surface of a pool. If you dive to 2.0 m beneath the surface, what happens to the absolute pressure on you? A) It quadruples. B) It more than doubles. C) It doubles. D) It less than doubles. E) It does not change.
19 5. A tall container is filled with water. Two holes are punched in the container near the bottom, and water rushes out. If the cup is dropped so it falls freely, will the water flow out slower? Not at all? Faster?
20 Homework Chapter 13: 18, 36, 56, 90
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