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Thursday, October 13, 2016

For classes today

Periods 1-2, 5-6, 8-9:

First, try to reach consensus on the two problems from Tuesday, with non-uniform charge densities. Focus on the setups, as you talk with each other and compare what you had. Feel free to bring up the AP solutions if necessary, either on the front computer or your chromebooks or phones..

We are moving on into NON-Gaussian problems, where we will need to find the E-fields and potentials for objects that are not spherical, flat, or 'really long.' Actual wires and sticks actually do have ends, so how do we handle reality? Watch a video and take notes on how to do this for sticks, as well as a curved stick/partial ring. There is a third on finding potentials for sticks. These involve integrals, as we try to sum up the E-field components and potentials from each point charge on the object.

In our packet, you can begin trying the problems on pages 6 and 7 in small groups.

Period 3:

You should watch and take notes on a video about Newton's law of gravity, which has an example of how to use it, as well as a second video on how to use Newton's laws to figure out how strong gravity is and the acceleration of gravity at different distances above the earth.

Based on these, you can get into small groups and go through the homework problems from Tuesday, helping each other figure out how to do them (similar to examples in the videos), and reach consensus on your answers. We will extend on these ideas tomorrow and get into figuring out how fast satellites need to travel to stay in orbit, as well as how fast we are moving around the Sun right now!

Sunday, October 9, 2016

Fundraiser for Malawi Schools - Planting Crops to Fight Famine!

For those interested in learning more about the situation in Malawi, Africa, and the drought and famine that are presently taking place for millions of people, you need to be logged in with your account and can click here for more information. We are trying to get cash donations so we may get money to teachers on the ground, which they will use to begin planting crops specifically for the schools. Students will learn about agriculture in this type of environment, so they may develop the skills necessary for the subsistence farms which are common to this part of the world (where there is also severe poverty). Thank you for your interest, and any donation can be brought to Doc V in room H322!! If we average just $1 per person in ETHS, we could help fund crops for four schools!

Wednesday, October 5, 2016

Next set of material in E&M

We will be finishing off Gauss's law, with non-uniform charge densities. Then we will begin looking at how to find potential for shells of charge, and this will move into techniques for finding fields and potentials for NON-Gaussian shapes, such as sticks with ends and partial rings of charge, using integration.

Monday, October 3, 2016

Nobel Prize week!!

The Nobel Prize for 2016 for Physics went to three professors who, in the 1970s and 1980s laid the theoretical groundwork and topological predictions of strange phases of matter. Things like superfluids, superconductors, single-atomic layered materials, thin magnetic films, and so on, were predicted, and over the past couple decades others have developed the technologies and experimental methods for actually showing these weird states of matter can exist. Generally they only exist in the lab, and not naturally, such as superconductors and superfluids, simply because they require such low temperatures. Scientists and engineers are just learning how to apply these things to next-generation technologies, which some of you may very well be involved in!

The Nobel Prize for 2016 for Chemistry went to three professors, including Fraser Stoddart of Northwestern, They were some of teh first scientists to work on and actually develop first generation nanomachines. These are machines with moving parts and energy sources that are of molecular size scales! Many say that these are like the first electric motors of the mid-1800s, and the applications of the nanomachine era are waiting to be developed, leading to an entirely new industry and level of technology that has never existed. Your generation will develop this new sector of industry and technology!

The Nobel Prize for 2016, for Medicine and Physiology, was awarded today to the Japanese doctor Yoshinori Ohsumi. He was responsible for discovering how cell's can degrade and recycle cellular components, which is a process all cells carry out. It may have huge implications on a variety of diseases, such as cancer, that are based around cellular processes that have gone awry. This process is now called autophagy.

Friday, September 30, 2016

Possibilities for research in an NU lab - some quantum implications!

Especially juniors, let Doc V know if you have any interest in the lab of Prof. Chandrasekhar. There are some research options that will be available!!

Thursday, September 29, 2016

For Classes

Hi everyone, my apologies for having to get home to get a sick kid to the doctor.

Periods 1-2, 8-9:

The quizzam is tomorrow, so you have a chance to do review sets. One is on the school website. Go to the Newton's laws folder, and check out the Review Set. Solutions and explanations are all in the file. There is also a good site with practice questions at Learn AP Physics C.  Click on Newton's laws for practice questions and solutions.

If you need to do any last minute finishing touches on the lab report, you can do that. Share labs with Work together to make sure you are good with the HW sets, which are all collected tomorrow.

Period 3:

Watch the launch scenes from the movie 'Apollo 13.' Use the video guide the substitute gives you as you watch, and think of things in terms of Newton's laws that we are studying. Think about what forces are involved, what the astronauts would be feeling at different stages of launch, and the resulting motion of the rocket.