15.053 Recitations

Class

A solid metal ring is placed on an iron core whose base is wrapped in wire. When DC current is passed through the wire, a magnetic field is formed in the iron core. This sudden magnetic field induces a current in the metal ring, which in turn creates another magnetic field that opposes the original field. This causes the ring to briefly jump upwards. If there is a cut in the ring, it cannot form current inside it, and thus will not jump. When the ring is cooled in liquid nitrogen, the resistance of the metal is lowered, allowing more current to flow. This lets the ring jump higher. However, the magnetic field curves away at the top of the iron coil, meaning with DC power, the ring will never fly off the top.When AC current is passed through the wire, the ring flies off the top of the iron core. This is due to the fact that the current lags the emf by 90 degrees in inductors (which is what we have here). This yields forces on the ring that are always pointing upwards, even as the current oscillates.

How Tats Cru Gets Inspired

Make it a Map

Narrative Structure in Comic Books

A Gravity Simulation using Scratch

Simulation & Abstract Animation

Simulation Defined by Mike Danziger: Simulation and Visualization Researcher at MIT

VIrtual Recitation 06 46 minutes 4 problems in 1 file Chaptered 320 x 240 15fps 300k rate

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Exam 2 Review: Part 1/11 Professor Gabriella Sciolla, Physics Solenoid, current, magnetic field, Amperian loop, Ampere's law -------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 2/11 Professor Gabriella Sciolla Charge, electric field, symmetry, Gauss's law, flux ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 3/11 Professor Gabriella Sciolla, Physics Moving charges, current, velocity, magnitude and direction of magnetic field ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 4/11 Professor Gabriella Sciolla, Physics Ampere's law, Amperian loop, symmetry, magnetic field, enclosed current ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 5/11 Professor Gabriella Sciolla, Physics Current in cylindrical shell, current density, regions, Ampere's law ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 6/11 Professor Gabriella Sciolla, Physics Infinite wire, round loop, direction of magnetic field, Biot-Savart law ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 7/11 Professor Gabriella Sciolla, Physics Rotating loop, angular velocity, magnetic field, flux, emf, Faraday's law ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 8/11 Professor Gabriella Sciolla, Physics External magnetic field, emf, flux, magnitude and direction of current ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 9/11 Professor Gabriella Sciolla, Physics Magnetic field, constant flux, increasing current, induced emf ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 10/11 Professor Gabriella Sciolla, Physics Magnetic field, Ampere's law, magnetic forces, force directions ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 11/11 Professor Gabriella Sciolla, Physics Magnetic forces, magnitude and direction ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Creative Brain Trust!

Reaching Your Audience

The first lecture of a short course given by prof. Beretta during IAP 2008 to offer a quick view of how the general principles of thermodynamics can be very effectively presented and taught in a rigorous way, by following the treatment developed in the textbook Gyftopoulos & Beretta, Thermodynamics. Foundations and Applications, Dover, 2005. The treatment resolves conceptual loopholes and logical deficiencies which are present in traditional treatments of thermodynamics, and it is rigorous because it builds up a set of unambiguous definitions of all the basic concepts needed in the exposition. The operational definition of entropy given in this lecture is valid not only for equilibrium states but also for nonequilibrium, and not only for macroscopic systems but also for miscorscopic ones. While viewing the lecture, it may help to open a closeup of the blackboards at the end of the lecture, available at http://web.mit.edu/beretta/www/ThermoNutshellBlackboards-1.htm

LEGO Animations of Cell Division! The LEGO Chromosome Set can be used to illustrate the two kinds of cell division: mitosis and meiosis. The key concept here is that mitosis produces identical cells while meiosis does not. The LEGO fish in the set has three pairs of chromosomes with genes for the colors of the fish's tail, fin and spots. The LEGO Fish has three pairs of chromosomes: Chromosome 1 has the gene for tail color: green or white. Chromosome 2 has the gene for fin color: red or brown Chromosome 3 has the gene for spot color: blue or red The gene color underlined above is dominant. (The word dominant means that in cases where a fish has two different color genes on a pair of chromosomes, the underlined gene color will be the winner.) Find out more on the ScienceBuilders website.

LEGO Animations of Cell Division! The LEGO Chromosome Set can be used to illustrate the two kinds of cell division: mitosis and meiosis. The key concept here is that mitosis produces identical cells while meiosis does not. The LEGO fish in the set has three pairs of chromosomes with genes for the colors of the fish's tail, fin and spots. The LEGO Fish has three pairs of chromosomes: Chromosome 1 has the gene for tail color: green or white. Chromosome 2 has the gene for fin color: red or brown Chromosome 3 has the gene for spot color: blue or red The gene color underlined above is dominant. (The word dominant means that in cases where a fish has two different color genes on a pair of chromosomes, the underlined gene color will be the winner.) Find out more on the ScienceBuilders website.

LEGO Animations of Cell Division! The LEGO Chromosome Set can be used to illustrate the two kinds of cell division: mitosis and meiosis. The key concept here is that mitosis produces identical cells while meiosis does not. The LEGO fish in the set has three pairs of chromosomes with genes for the colors of the fish's tail, fin and spots. The LEGO Fish has three pairs of chromosomes: Chromosome 1 has the gene for tail color: green or white. Chromosome 2 has the gene for fin color: red or brown Chromosome 3 has the gene for spot color: blue or red The gene color underlined above is dominant. (The word dominant means that in cases where a fish has two different color genes on a pair of chromosomes, the underlined gene color will be the winner.) Find out more on the ScienceBuilders website.