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### 10_1425_web_Lec_26_MoreHydrostatics

Course: PHYSICS 1425, Spring 2010
School: UVA
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Hydrostatics Physics More 1425 Lecture 26 Michael Fowler, UVa Basic Concepts Atmospheric Pressure Buoyancy: Archimedes Principle Clicker Question Galileo once observed that even a carefully constructed pump, situated at ground level, was not able to draw up water out of a well deeper than about thirty feet. Is this still the case? A. Yes B. No How Suction Pumps Work Galileo hadnt realized that a suction...

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Hydrostatics Physics More 1425 Lecture 26 Michael Fowler, UVa Basic Concepts Atmospheric Pressure Buoyancy: Archimedes Principle Clicker Question Galileo once observed that even a carefully constructed pump, situated at ground level, was not able to draw up water out of a well deeper than about thirty feet. Is this still the case? A. Yes B. No How Suction Pumps Work Galileo hadnt realized that a suction pump just lowers air pressure above the water in the pipe, then the outside atmospheric pressure pushes it upand theres a limit to how far up that pressure can push. Galileos pupil Torricelli was the first to understand, he built the first mercury barometer. Hed been ordered by his Grand Duke to figure out how to improve the pumps. Guinness Certified Largest Barometer! This is a water barometer in the Netherlands. About how tall is the column of water? A. 20 ft B. 30 ft C. 40 ft D. 50 ft Otto von Guericke was impressed by Torricellis discovery of atmospheric pressure. He built a water barometer. He was the first to forecast weather based on barometric observations. He found a great way to demonstrate atmospheric pressure Magdeberg Hemispheres, 1654 Boyle and Hooke Build a Pump Inspired by von Guerickes hemispheres, Boyle and Hooke constructed an air pump in Oxford in1659. A colleague, Papin, found an easier way to use air pressureuse steam to drive out air, then condense it (see demo). This led directly to the first steam engine in 1698! Buoyancy Force X Any object immersed in a fluid feels pressure forces all around it. Since the pressure is greater at greater depth, there is a net upwards forcethis buoyancy. is called Suppose the underwater object is replaced with a ghost: an extremely thin plastic sheet of the same identical shape, just enclosing the fluid. The pressure forces on this ghost will be identical, and they will be just enough to support the weight of the fluid inside. Archimedes Principle A body immersed (or partially immersed) in a fluid experiences a net upward buoyancy force equal to the weight of the fluid displaced. I dont think so Approximate the balloons as a sphere of helium, guess the radius, hence the lift. How does it compare with the weight of a house? (Not to mention the balloons!) Clicker Question A glass of water filled to the brim has an ice cube floating in it. As the ice cube melts, the water A. Spills over the brim. B. Stays the same. C. Gets a little lower. Clicker Question A glass of water filled to the brim has an ice cube inside, stuck to the bottom. As the ice cube melts, the water A. Spills over the brim. B. Stays the same. C. Gets a little lower. Clicker Question A glass of water has an ice cube floating in it. The cube is 90% submerged. For an exactly similar cube in a glass of water at a future resort on the Moon, where gravity is a lot less, A. The cube will ride higher in the water. B. The cube will ride lower in the water. C. The same percentage will be submerged as on Earth. You are sitting in a rowing boat in a small pond. There are some bricks in the boat. You take the bricks and throw them into the pond. They sink to the bottom. What happens to the water level in the pond, as measured at the bank? A. It falls. B. It rises. C. It stays the same.
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UVA - PHYSICS - 1425
HydrodynamicsPhysics 1425 Lecture 27Michael Fowler, UVaBasic Concepts Fluid conservation Bernoullis EquationYou are sitting in a rowing boat in a small pond. There are somebricks in the boat. You take the bricks and throw them into thepond. They s
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Simple Harmonic MotionPhysics 1425 Lecture 28Michael Fowler, UVaForce of a Stretched Spring If a spring is pulled toextend beyond itsnatural length by adistance x, it will pullback with a forceF = kxwhere k is called thespring constant.The sam
UVA - PHYSICS - 1425
Damped and Driven Harmonic MotionPhysics 1425 Lecture 29Michael Fowler, UVaDamped Harmonic Motion In the real world, oscillators CSprings force Drag forceexperience damping forces:F = kx F = bvfriction, air resistance, etc.m These forces always
UVA - PHYSICS - 1425
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UVA - PHYSICS - 1425
Kinetic Theory of GasesPhysics 1425 Lecture 31Michael Fowler, UVaBernoullis Picture Daniel Bernoulli, in 1738, wasthe first to understand airpressure in terms of moleculeshe visualized them shootingaround very rapidly in a closedcontainer, suppor
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More Kinetic Theory of GasesPhysics 1425 Lecture 32Michael Fowler, UVaVapor Pressure and Humidity The H2O molecules in liquid water stronglyattract each other, holding the liquid together.But these molecules are still jiggling around,with a Maxwell
UVA - PHYSICS - 1425
Heat and Energy ConservationPhysics 1425 Lecture 33Michael Fowler, UVaHeat Flow If something warm is in contact with somethingqcooler, the warm thing cools down as the cool thinggets a little warmer. This flow of energy, called heat,was until the
UVA - PHYSICS - 1425
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The Second Law of Thermodynamics:Heat EnginesPhysics 1425 Lecture 35Michael Fowler, UVaThe First Law of Thermodynamics In any process, total energy is always conserved. Once it was fully realized that heat is just anotherform of energy, it was esta
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