I am a professor at Rice University. My lab develops new tools for molecular structure in biomembranes based on nanoparticles and vibrational spectroscopy:
hafnerlab.blogs.rice.edu/
I have taught sophomore and freshman physics at Rice for 15 years. These videos are from online courses I made with Rice Online for edX and Coursera, as well as homework solutions I made in my office. Here are links to the courses if you are interested:
edX www.edx.org/course?search_query=hafner+ricex
Coursera Physics 101 - Forces and Kinematics - www.coursera.org/learn/physics-101-forces-kinematics Physics 101 - Energy and Momentum - www.coursera.org/learn/physics-101-energy-momentum Physics 101 - Rotational Motion and Gravitation - www.coursera.org/learn/physics-101-rotational-motion-gravitation
Where I struggled so much in physics was the twists and turns in the questions, the subject is already hard enough, and trying to trick people into getting the wrong answer is just diabolical.
i’m not that bad in math. I have a small RU-vid channel on another handle where I teach arithmetic, algebra trig and calculus. But physics is unbelievably challenging. It just feels like a different language. If you tell me what formula it is, I can very easily manipulate whatever we need to, but I can’t independently identify what to use, it’s really embarrassing actually no matter how hard I just can’t figure out although I wonder if that role
YOU EVEN HAVE TO BRING YOUR LEFT WING DRIBBLE INTO BELOVED MATHEMATICS ??? YOU LEFT WINGERS ARE TRUELY THE USEFUL IDIOTS. I VANNOT BELIEVE THAT I CANNOT WATCH A MATH VIDEO WITHOUT A TRUMP DERANGEMENT SYNDROME ASS.
You totally explained it wrong. The key is that the 3rd match slightly pushes the string, bending it towards the table. As a result, the center of the weight of the entire thing moves slightly left from the edge of the table onto the table, so that it won't fall.
In RL Circuit you used Faraday laws because kirchoff loop law wasn't applicable ,but in RC circuit too current is changing then why did you applied kirchoff loop law here.
WHAT HE SAID WAS I can actually show you that with a real charged beam. So this is an evacuated tube and it puts a big negative potential on this electrode. So high that it actually boils, electrons come off the electrode and makes just a beam of electrons. It also has some ionized, a little bit of a background gas that ionizes to keep everything stable and doesn't charge up too much. But mostly you have electrons flying off this electrode and most of them go straight to this metal plate and that's the end of the story. But there's a little slit in the plate. So some of them get through and make a beam that keeps going. So you've got a beam of electrons and this little plate is tilted a little bit so they slowly along this direction they crash into the plate. The plate has a phosphor on it so it lights up when they crash into the plate. So when I turn it on, there you can see the beam. That's a beam of electrons flying through the tube. So what we're going to do is bring a magnet and see what it does to the beam of electrons because remember this bar magnet, the field lines go from the north pole, the red is the north pole to the south pole. So if we just think about the poles or the field right at the ends because we're going to use the ends, it will be this way near the north and it will be pointing in in the south. So I will bring the north pole pointing at me at the beam and let's see what that will be. We have the beam going this way and I'm going to bring this pointing in so we're going to have a B field like this. So V cross B also the same as this. It should be up. So let's see what happens. There's our beam and I bring in this magnet. There's the deflection we hope for but it's down and it's down and why is it down? It's down because they're electrons. Q in this case equals negative E. The charge is negative. When the charge is negative the force magnitude is negative which means it goes the opposite direction. So right hand rule says it's up for positive but the force is down. for an electron. So it did deflect the right way. It deflected down. We can also check. We can take and aim the south pole at the beam. So here we go. Bring in the south pole. And there it goes. It deflects up, just like you'd expect. Because when you're bringing the south pole, the magnetic field is pointing the opposite direction. Now I'm bringing in a field that's pointing away from the beam. So it would seem that the charged particle beam really is deflected the direction that you would expect.
its 3 am and i cant get enough of your demos!!! every one of them is really really interesting and helps in understanding the concepts a lot!!! thank you so much for your work sir
