FizziksGuy
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Everything posted by FizziksGuy
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Aha. I understand. The integration your teacher is showing isn't the integration part of Gauss's Law, she's just using integration to find the charge enclosed by the Gaussian surface. If she had just told you the charge enclosed was Q=Pi*a*R^3, you could have put that right into Gauss's Law. So to answer your question, when do you have to integrate to find the charge enclosed? When you're given some sort of charge density function instead of the total enclosed charge. To use Gauss's Law, you have to know what Qenclosed is. If it's not given directly, you need to figure out some way to find it, and in many problems, that will involve some amount of integration.
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I'll have to cut back on my wheelie addiction...
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Hi Jess, Gauss's Law is a law of physics, it's always true. However, as far as usefulness goes, it's only really useful for finding the electric field when you have a charge distribution that exhibits spherical, cylindrical, or planar symmetry. Some of the examples you'll find in the guide sheets (http://aplusphysics.com/courses/ap-c/tutorials/APC-EField.pdf) or tutorial video (http://aplusphysics.com/courses/ap-c/videos/APC-Gauss/APC-Gauss.html) include a sphere or shell of charge (spherical symmetry), a line of charge (cylindrical symmetry), and a plane of charge. Hope that helps... make it a great day!
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Name: Gravity Waves Detected - The New York Times Category: Circular Motion & Gravity Date Added: 2016-03-14 Submitter: FizziksGuy http://www.nytimes.com/2016/02/12/science/ligo-gravitational-waves-black-holes-einstein.html?_r=0 Gravity Waves Detected - The New York Times
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Name: CYMATICS: Science Vs. Music - Nigel Stanford Category: Sound & Music Date Added: 2016-03-14 Submitter: FizziksGuy Published on Nov 12, 2014 http://NigelStanford.com/Solar_Echoes From the album 'Solar Echoes'. http://NigelStanford.com/Cymatics Download in 4k / HD. All of the science experiments in the video are real. Watch behind the scenes and see how it was made. Facebook: https://www.facebook.com/johnstanford... Twitter: https://twitter.com/nigel_stanford Directed by http://ShahirDaud.com Cinematographer: Timur Civan http://timurcivan.com Category Music License Standard YouTube License CYMATICS: Science Vs. Music - Nigel Stanford
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Part e is quite difficult (beyond scope of AP-1) and I highly recommend using a calculator or computer for numeric simulation. You need to take your kinematic equations for horizontal and vertical and put them together into an equation with h as your variable. The bad news -- there is no easy way to get this equation into an expression for just h, but rather, you may have something like h+Btanh+3h^2/sinh = C That's not the equation, but you perhaps get the idea. Then plug that into a computer or calculator to find a numeric solution. Verify your solution works, and you're done.
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Video Discussion: Work-Energy Theorem Problem by Billy
FizziksGuy replied to Flipping Physics's topic in Video Discussions
Nicely done, Billy! -
I think one of our jobs as professional educators is to open a door to the students to see what possibilities may await them if they continue their studies. Along those lines, many aspects of modern physics are exciting and interesting and really get kids to start thinking about the world around them. Though it's not prescribed in any of our state or district curricula, I love teaching very basic relativity as well as microelectronics. Relativity tends to "blow the kids' minds," and microelectronics provides just a touch of insight into how the computer chips that in many ways dominate our daily lives function.
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Tried solving what?
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Every now and then you scare me a little...
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Monte Alban is a happy place... one of my family's favorites!
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So how are you a horrendous driver? Too fast? Swervy?
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Love the incorporation of sports and video games with physics. Just out of curiosity, is SWEAT an acronym for something?
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Looks like a great time! I look forward to hearing how your next bowling adventure goes as you throw in some conservation of energy calculations!
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That's a great question, and assuming you're talking about the first 10-12 seconds or so, I'm not certain. There are lots that could be said about Newton's 3rd Law with the guns, and conservation of momentum, but as you don't know the mass of the projectiles fired, I'm not certain what conclusions your instructor is looking for. There are TONS of examples of N3 Law and Conservation of Momentum being violated in this movie (which is fine, it's just for fun), but this isn't one of the examples I'd pick. I'd go with something closer to: https://youtu.be/fTqxFIpc1j4?t=38s
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And of course, the shaking of the branch is a version of damped simple harmonic motion!
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Yikes. This scares me a bit. Sure hoping my little one decides to switch from ballet to another activity before we get to the stage of pointe shoes...
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Great job unscrambling the mysteries of your first attempt!
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I think you're going to like Gauss's Law in our E&M semester!
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Hi Niha. I'm not sure why you're having trouble uploading images. If you post your question and then drag an image file into your question (see the bottom of the edit page) or link to it, it should show up. I'll try it here to test... Once you've uploaded the file, click the little "plus" button to insert the picture into your post. Please note that you should be careful not to upload copyrighted questions from other sources, and also, if you can show what work you've done so far, it will all us to better see where you're getting stuck and provide more targeted assistance. Thanks, and good luck!
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Hi Niha. A great place to start would be a free body diagram of the trailer. You have friction to the left (400N), and the tension to the right. You also know it is accelerating at 2 m/s/s, so you could write Newton's 2nd Law, F=ma, as T-400N=500kg(a), and solve for T.
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Wow. The lack of ingenuity / practicality in that story leaves me paralyzed in fear for our society's future.
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Physics is everywhere, even involved in toys (or more accurately, specifically in toys!)
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What do you call it when your Christmas tree explodes? A tannenbaum.
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What a purrrrfect story.
