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### 10_1425_web_Lec_18_CircularMotion

Course: PHYSICS 1425, Spring 2010
School: UVA
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Word Count: 1261

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Motion Physics Circular 1425 Lecture 18 Michael Fowler, UVa How Far is it Around a Circle? A regular hexagon (6 sides) can a be made by putting together 6 equilateral triangles (all sides equal). The radius of the circle = 1. The distance all the way round the hexagon (red path) = 6. The distance all the way round the circle (green path) is a little more: in fact, its 2r = 6.283 Arcs Subtending Angles: the...

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More Rotational DynamicsPhysics 1425 Lecture 20Michael Fowler, UVaClicker QuestionA uniform rod is free to rotate in a vertical plane abouta frictionless hinge at one end. It is released from restat an angle of 30. (I = (1/3)ML2, = Mg(L/2)cos30)The
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Angular MomentumPhysics 1425 Lecture 21Michael Fowler, UVaA New Look for = I Weve seen how = I works for a bodyrotating about a fixed axis. = I is not true in general if the axis ofrotation is itself accelerating BUT it IS true if the axis is thro
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UVA - PHYSICS - 1425
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UVA - PHYSICS - 1425
HydrostaticsPhysics 1425 Lecture 25Michael Fowler, UVaBasic Concepts Density Pressure: Pascals PrincipleThe Crown and the Bathtub Around 250 BC, the king ofSyracuse commissioned a newcrown,and gave the goldsmithabout 1 kg of gold (size of a Dba
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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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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
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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
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Gas Processes and Heat TransportPhysics 1425 Lecture 34Michael Fowler, UVaThe First Law of Thermodynamics A closed system has a total internal energy Eint. This energy can be changed in two different ways:A. The system can do work W, or have work do
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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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EntropyPhysics 1425 Lecture 36Michael Fowler, UVaFirst and Second Laws ofThermodynamics A quick review. First Law: total energy conserved in anyprocess: joules in = joules out Second Law: heat only flows one way, and wecant turn heat into just wo
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