Lecture begins with a recap of Gauss's Law, its derivation, its limitation and its applications in deriving the electric field of several symmetric geometries—like the infinitely long wire. The electrical properties of conductors and insulators are discussed. Multiple integrals are briefly reviewed.
The electric field is discussed in greater detail and field due an infinite line charge is computed. The concepts of charge density and electric flux are introduced and Gauss's Law, which relates the two, is derived. It is applied to the study of the electric field generated by a spherical charge distribution.
The electric field is introduced as the mediator of electrostatic interactions: objects generate the field which permeates all of space, and charged objects in the field experience a force with magnitude proportional to their charge. Several instructive examples are given, including the field of an electric dipole and the notion of the electric dipole and dipole moment. The notion of field lines is introduced.
The course begins with a discussion of electricity. The concept of charge is introduced, and the properties of electrical forces are compared with those of other familiar forces, such as gravitation. Coulomb's Law, along with the principle of superposition, allows for the calculation of electrostatic forces from a given charge distribution.
Professor Brownell talks about the situation with world hunger and how it is measured. He reviews the world distribution of hunger, from how many people are affected, to the physiological, psychological, and behavioral consequences of starvation. He reviews how geopolitical issues affect the world food systems in different parts of the world, including climate, war, disease, and refugees.
Professor Brownell talks about the situation with world hunger and how it is measured. He reviews the world distribution of hunger, from how many people are affected, to the physiological, psychological, and behavioral consequences of starvation. He reviews how geopolitical issues affect the world food systems in different parts of the world, including climate, war, disease, and refugees.
Ashley Gearhardt gives a guest presentation about the relationship between food and addiction, and how emerging clinical research suggests that eating maps onto a model of addiction. Professor Kelly Brownell reviews how culture affects eating, from what's acceptable to eat to how to eat it. He reviews cultural differences between the American and French food cultures. He then suggests how American values are changing through recent movements which are concerned with the story of food and the features of food before it is consumed.
This lecture addresses the complicated relationship between biology and eating. Professor Brownell explores the physiology of taste and eating. Many parts of the body are affected when people eat food, and many biological factors affect what people choose to eat, how much they eat, and the way they regulate their body weight. The experimental methods used to assess how body weight is affected by genes are also reviewed.
Professor Brownell reviews the challenges inherent in research assessing the link between diet and health, and the challenges of basing a diet upon different dietary recommendations. Fundamental information on nutrition is presented, as well as how our current diet suggests we are eating too much or too little of different classes of sugars and fats.
This lecture focuses on how people measure nutrition and what it means for health. Professor Brownell reviews methods to track food intake, from a population level to an individual level, emphasizing methods and measurement error as well as portion underestimation. The definition of a calorie and how it is measured are also discussed, as well as people's changing relationships with macronutrients and micronutrients in food and with water.