E n E r g y a n d L i f E in .NET

Make QR in .NET E n E r g y a n d L i f E

chapter 4 E n E r g y a n d L i f E
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the bucket minus the number of all other marbles we take out of our bucket This is not the most obvious way to break things up At least, not until you consider that maybe there s something special about yellow marbles Indeed this is the case: there is something special about heat as a form of energy In fact there are three reasons why heat is special It is primarily the first of these three reasons that explains why, by convention, we account for heat separately from other forms of energy But the other reasons also provide motivation for thinking of heat separately
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Heat Is Special
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The first reason we account for heat separately is historical The laws and equations of thermodynamics were originally developed through the study of heat engines A heat engine is a motor that converts heat energy into motion, for example, a steam engine or an internal combustion engine This is why the conventional way to write the first law of thermodynamics is in terms of heat put into a system and work (motion) done by the system Historically, almost all of our early experiences with thermodynamics involved lighting fires, boiling water, and trying to get some useful work out if it The second reason heat is special is that heat is the only type of energy that is always readily available to measure and possibly use This might not seem the case on a very cold winter s day, but it s true Heat is the kinetic energy and random motion of molecules Even on a cold winter s day molecules are constantly vibrating or moving about Even in solid ice, the crystallized water molecules are continually vibrating Molecular kinetic energy (heat), as we will see, can contribute to biochemical processes Molecular motion is always present Only at a temperature of absolute zero (227315 C) far colder than the coldest of winter days (and certainly far colder than we ever expect to find any living things that we study in biophysics) does molecular motion stop The third reason heat is special is that heat is, in a sense, the lowest form of energy Heat is the least organized form of energy It is this disorganized quality of heat that also makes it often the most inefficient form of energy from which to extract useful work
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What Is a System
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All of the above assumes we know what we mean by system In thermodynamics, a system is simply that part of the universe that we are interested in The rest of the universe is called the surroundings Thermodynamic systems
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B i o p h y s i c s D e mys tifieD
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are further qualified in terms of their contact with the surroundings An open system can exchange both matter and energy with its surroundings A closed system can exchange energy, but not matter An adiabatic system is thermally isolated from its surroundings; there is no exchange of heat or matter, but it is possible for the system to do work on its surroundings (or to have work done on it) In thermodynamics energy is typically measured in units of calories or joules One calorie is the amount of energy it takes to increase the temperature of 1 g of water from 145 C to 155 C at 1 atmosphere of pressure One joule is the amount of energy it takes to lift an object weighing 1 N a distance of 1 m That is, 1 joule (J) 5 1 newton meter (Nm) One calorie is equal to 4184 J
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PROBLEM
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A 225-lb athlete drinks a glass of orange juice (120 calories) and walks up to the top of the Empire State Building What is the change in his internal energy, assuming the only heat transfer is the 120 calories from the orange juice, and the only work done by the athlete is lifting his own weight to the 102nd floor Assume 3 m per floor
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