Anyone who was in class would of heard the great debate about a certain picture that seemed to be rotating different ways. But how can two people see different things while looking at the same picture. Optical Illusions are usually 2-D things that are pretending to be 3-D and since we see life in 3-D so our brain takes the 2-D image we're seeing and makes it into 3-D the reason why people saw the girl spinning in both directions is because she is spinning both ways, only at different times. But
As Dave said in his post, our computers class has been looking at this website called MindCipher.com. On this website there is a picture that asks, is she rotating left or right. I want to see what everyone thinks because our class is in disagreement in about this
http://www.mindcipher.com/puzzles/25
This year has gone fast. It seemed like only yesterday that summer ended and we started our senior year. This senior year has been the best year by far and now that it's almost over it's hard to realize that we're almost done. Physics this year has been a great experience. The independent units were probably my favorite units because I could do everything at my pace which was great until my pace was too slow and I found myself cramming to get everything done the last week. They have been an eye
Faraday Cages are used to cancel out electric fields and block most forms of electromagnetic radiation. And people in today's world have used this in some creative ways. Some people put their phones in these cages so that they can't receive any calls or texts. But I was reading and this article said that a shop lifter had be caught with a bag lined with aluminum foil. This created the bag a Faraday cage so that when the person put the item they were stealing in the bag, the bag blocked most of t
There were many different types of catapults but every single one relied on the same principles. They all took potential energy, and transferred it into kinetic energy that sent the balls flying across the field or at least tried. There were different ways of storing the potential energy; spring potential energy or gravitational potential energy. Both proved to be very effective. However what really separated the best from the rest was the use of a slingshot. A slingshot increases the effectiven
We have been told that nothing can go faster than the speed of light but what happens if we took a very long arm and rotated it around an axis. When a wheel is turning, the edges are turning faster than the middle in order to keep up. Lets say we took a laser pointer and pointed at the moon which is 384,400 km away, and flicked our wrist and a radian per second then the end of the laser pointer would be traveling 384,400,000 which is faster than the speed of light. So would the end of the laser
Plasma by definition is a highly ionized gas that usually occurs at high temperatures that conducts electricity and is affected by a magnetic field. But did know that plasma is the most common state of matter(if you don't count dark matter which hasn't been proven yet) Plasma is what makes up suns as well as lightning bolts and some regions of the earth's upper atmosphere. A plasma is composed of positive charged ion and free electrons but they're separate despite the attraction for each other.
Released in 1984 Tetris has been confounding physicists as to how the blocks move in the way they do. Now almost 30 years later, the secrets of tetris have final revealed. The blocks are moved using a combination of magnetism and electricity to move the block sideways and down. Unseen to the player each block has a slight positive charge and at the bottom of the screen there is eletric plate that is negatively charged. This causes the block to accelerate downward but it is only on for a fe
This was our second Independent Unit in a row and although I like the independent units a lot, I don't think have two back to back was a good idea. I know personally for me I just didn't have the motivation to get the work done and I found myself wasting whole periods. This left me with a lot of work to do last minute(hence the blogs at 11 at night). Also i feel like I don't really understand this unit as much as I do the other units, which is another result of my slacking. But we'll see how the
So I was watching an episode of the Big Bang theory and in the background of the scene i was watching was a physics equation. It said F=dP/dt which is an equation that i have never seen to before and I wondered if it was true. On the board it went on to expand the equation to F=d(mv)/dt=m*dV/dt and since dV/dt=a F=ma which is the Newton's law that we all love and know. I just thought that this was an interesting and new way to look at a very well know equation
Atomic clocks are the most accurate clocks we have and without them, everyone's time could be a little off which would mean GPS navigation would be impossible and other things that rely on exact timing, like space flight wouldn't work. Most atomic clocks are made of cesium and measure the frequency of oscillation. Cesium atoms are given energy in the form of heat and this causes the atoms to change energy states and start oscillating at their principal resonance which is a know value. Measuring
So this summer I will be working for a company called Lumetrics which is an engineering company that develops ways to measure very thing object without ever touching said object. They do this by using light and reflection of light. This technology is currently limited to transparent and translucent material but it's still really cool. By shinning a light into an object, some of the light bounces back at the first edge, some passes through. The light that continues through hits the back edge and
Today is a beautiful day for a hurricane and since we have no school we all get to sit home and watch the hurricane bear down us on the radar. Looking at the Google earth we can all see that Sandy looks like a giant cloud with a hole in the middle that is spinning counter clockwise. But why? The answer is the Coriolis effect. Now what the heck is that? "In physics, the Coriolis effect is a deflection of moving objects when they are viewed in a rotating reference frame." This is saying that an o
With our last test we finished mechanics and official ended the first halve of the year. Surprising I didn't find the course as hard as I thought it was going to be. AP-B last year taught us most of the basics so we already knew most of the physics that we used this year. The major difference this year was the addition of calculus which isn't terribly hard compared to what Mr. Muz gives us. Also this year we aren't just given most of the equations and told to memorize; we are shown how to derive
What is fire? Fire is hot but where does it come from? Fire is the result of extreme heat, usually when organic chemicals combusted with oxygen(thank you chemistry) but where does the light come from? The light results from electrons absorbing the heat energy and jumping up energy levels like we learned last year and the light is produced when the electrons fall back down to their ground state. However fire can look different. The fire from Bunsen burners in chem or propane fires look a lot dif
Gauss's Law
Gauss's other Law
Faraday's Law
Ampere's Law
We've already done the first one which isn't that bad and I hope they're all that simple. Although I think the second one means magnetic field though a closed surface is 0. And Faraday's law means something with E field is equal to the rate of change of magnetic flux. And i have no idea what Ampere's law is saying.
This post is all about gravity. All the review made it clear that I needed to work on Gravity.
G-6.67*10-11 Nm2/kg2
Fg=-GMm/r2
Ug=-GMm/r
(the negative means that gravitational potential is 0 at infinite distance)
both of those are given on table
g(or gravitational field)=GM/r2
so acceleration of an object in orbit is GMe(6*1024)/(6.3*106+r)2
velocity of an object in UCM since Fc=Fg
mv2/r=GMm/r2 v2=GM/r v=(GM/r)1/2 Total energy of an object in orbit
E=KE+Ug=.5m
The color that we see depends on the frequency of the light. Red Orange Yellow Green and Blue are the colors of light that we can see, so where does pink fit in? To find out, watch this video.
How about that minus green flamingo
F=q(v x
R=(mv)/(qB) for a point charge in a magnetic field
v=E/B (speed at which an object must be traveling not to feel a net force in a magnetic and electric field)
T(torque)=NIA x B
F=I(L x
B=(uo)q/(4Pi)*(v x r^)/r2
B=u0nI(for solenoids)
B=u0*2I/(4Pi*R) (Due to single straight wire)
B=u0*NI/(2Pi*R) (between the inner and outer radius of a toroid)
Integral over closed surface of (B dA)=0
Integral over closed curve of (B dl)=u0Ip
r^=r/|r|
Good luck to everyone tomorrow
In a very recent movie, a certain character purple suited character said the line "this is what happens when an unstoppable force meets an immovable object. While in the context of the movie, there was no unstoppable force or immovable object shown, what would happen in these two things really happened. But that the just the thing because all the fundamental forces are unstoppable and there is no such thing as a immovable object according to relativity. But what would a collision between an obje
1.) Don't catch senioritis too early
2.) Don't wait til last minute to do your blogs
3.) Watch the videos on Aplusphysics.com
4.) The book is your friend
5.) Try on the four minute drills
6.) Look at notes from AP-B
7.) Find a friend who knows what they're doing
or
8.) Teach your friends what to do
9.) Stay ahead on independent units
10.) Don't freak out and have fun
I'm going to start off with why I'm taking AP-C physics because I think that's the best place to start. But anyways I'm taking AP-C because i last year AP-B physics was one of my favorite classes and i really enjoyed learning how the world around us works. Also applying the things that we have been learning in math for the past four years is really rewarding because finally there's a reason to learn it instead of just because the teacher says we have to in order to past the final.
I am the k
Afraid of heights? Well this guy isn't. Felix Baumgartner just made skydiving out of a plane look like a joke. In case you haven't heard because you don't get service or internet under the rock you live beneath, Felix just jumped out of a balloon 128,100 feet above the ground. Yeah that's over 24 miles. He also broke the world record for the fastest skydiver; reaching a velocity of 833.9 mph, faster than the speed of sound. I guess I have to talk about the physics behind this crazy stunt. If we
