Mass
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Using acid-base titration to find mass of oxalic acid.
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Another exercise converting a mass composition to an empirical formula.
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Google has proven that if you build it, they will come, and their mass of tools to keep users logged in has been the crux of their success. Vice President of Search Products & User Experience Marissa Mayer elaborates on this strategy, pointing out that money - and advertisers - will always follow consumers. Focus on building sticky media that draws in a wide audience, and the method to its monetization will follow.
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Introduction to the center of mass.
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Momentum and its conservation during collisions is introduced. Kinetic energy can decrease or increase during collisions. When kinetic energy is conserved, we call it an elastic collision. The momentum vector, internal forces, external forces and the conservation of momentum are discussed. Professor Lewin does some air track experiments where the released energy is from a compressed spring; kinetic energy increases but momentum is...more
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Systemic risks of credit default swaps. Financial weapons of mass destruction.
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Doppler Effect, Binary Stars, Neutron Stars and Black Holes. Doppler shift is introduced with sound waves, then extended to electromagnetic waves (radiation). The Doppler shift of stellar spectral lines and/or pulsar frequencies provides a measure of the line-of-sight (so-called radial) velocity of the source relative to the observer. Combined with Newton's law of universal gravitation, this can lead to the orbital parameters and the mass...more
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The dynamics of a many-body system is examined. Through a variety of examples, the professor demonstrates how to locate the center of mass and how to evaluate it for a number of objects. Finally, the Law of Conservation of Momentum is introduced and discussed. The lecture ends with problems of collision in one dimension focusing on the totally elastic and totally inelastic cases.
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In this lecture Professor Lewin covers elastic and inelastic collisions, including a discussion on center of mass and internal inergy. He concludes with a Newton's Cradle demonstration, soliciting an analytical proof of his demo showing a lineup of colliding balls.
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This course consists of an international analysis of the impact of epidemic diseases on western society and culture from the bubonic plague to HIV/AIDS and the recent experience of SARS and swine flu. Leading themes include: infectious disease and its impact on society; the development of public health measures; the role of medical ethics; the genre of plague literature; the social reactions of mass hysteria and violence; the rise of the...more
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Figuring out the empirical formula from a molecules mass composition.
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The discussion of four-vector in relativity continues but this time the focus is on the energy-momentum of a particle. The invariance of the energy-momentum four-vector is due to the fact that rest mass of a particle is invariant under coordinate transformations.
