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MrMuffinMan

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  1. MrMuffinMan
    x=v2sin(2theta)/g(when fired from the ground level)
    t=(2H/g)1/2
    y max=v2sin2(theta)/(2g)
    Fab=Fba
    W=change in KE
    W=Fdcos(theta)
    Vmax= urg1/2


    x=r(theta)
    v=r(omega)
    a=r(alpha)
    T=FRsin(theta)
    wf2=wo2+2(alpha)(theta)
    atotal=(ac2+at2)1/2
    KE=.5mv2+.5Iw2

    Parallel axis theorem
    I=Icm+md2
    moment of interia
    Disk= .5mr2
    Ring=mr2
    Rod(middle)=1/12ml2
    Rod(end)=1/3ml2
    Solid sphere=2/5mr2
    Hollow shell=2/3mr2

    SHM
    T=1/f
    x=Acos(wt)
    v=Awsin(wt)
    a=Aw2cos(wt)
    w=(m/k)1/2

    Springs in series
    1/keq=1/k1+1/k2...
    Parallel
    keq=k1+k2

    Pendulums
    w=(Mgl/I)1/2
    T=2 pi (I/mgd)1/2

    There will be another post on just Gravity and I did read about the LaTeX equation editor but i couldn't get it to work
  2. MrMuffinMan

    Maxwell's equations

    By MrMuffinMan,

    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.
  3. MrMuffinMan

    Mind Trick

    By MrMuffinMan,

    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
  4. MrMuffinMan

    One way only

    By MrMuffinMan,

    Every Police/Law enforcement show has an interrogation where the criminal sweats it out while the detectives stand behind a one way mirror. How do this mirrors work? It's all about the light. Think of you're favorite interrogation room with a one way mirror in it. It's almost always bright in there while the room on the other side is kept dark. you might of thought like I did that it was to blind the suspects but in reality it's how the mirror works. A one way mirror is basically just half a mirror. The glass is treated with a special substance so that instead of every molecule in the glass being reflective which would make it a no way mirror, the reflective molecules are spread out so that only about half the molecules are reflective. Now when the police make the interrogation room really bright, half the light bounces back and there's enough of it to create a reflection. The rest of the light passes though the mirror so that eyes in the other room can take in the light and pass the image to our brain. On the flip side since the other room is so dark, the light from the interrogation room drowns the other rooms light, like a loud noise drowning out a quiet noise, and nether side see the image of the other room in the glass.

  5. MrMuffinMan
    Red Remover is a puzzle game which relies heavy on the laws of physics and breaks almost all of them at the same time. Red Remover is a game where you have to remove all the red blocks by click on certain blocks and making them disappear. This is the and most fundamental law of physics that this game breaks because matter and energy can never be destroyed and even if by clicking on the block caused them to turn into energy, there would be so much energy that it would blow all the near by blocks off the screen. In order to get the red blocks off the screen you have to remove block that are just floating in mid air that feel no effects by gravity. Once these blocks are gone, the blocks that have faces will feel the force of gravity but instead of accelerating the move at a constant speed. Also there are four planes of gravity, one going in each direction, and blocks are only affected by one if any of the forces of gravity. This is wrong because gravity doesn't choose what objects it wants to affect, it has to affect all objects. However this game is very good at the physics of collisions between blocks. When two blocks collide, the will usually continue to move, but the direction they move will change according to where the other block was heading. Even though this game breaks many of the fundamental laws of physics, it is a very good demonstration of have collision can affect objects.http://www.physicsgames.net/game/Red_Remover_Player_Pack_2.html
  6. MrMuffinMan

    Physics of Tennis

    By MrMuffinMan,

    The sport of tennis is the oldest and most love sport in the world. People have been playing tennis ever since the Acient Greeks took a stone and started hitting it back and forth over a fallen tree with branchs. Granted back then the sport was much more dangerous; many an acient greek lost an eye or a limb due to getting hit with the sharp rock that they played with, but even today the physics that govern the game today with the tennis balls with fuzz that sticks to your socks remain the same. Tennis is all about redirection of energy. A ball bouncing off the ground is effected by an impulse that changes the direction of it''s velocity. Current tennis balls are usually so bouncy that the collide elastically with the ground which means there's no loss in energy or speed. Then when the player hits the ball, the player usually swings the racket(or tree branch) which absorbs some the the energy so when the player hits teh ball some of the energy is lost but the ball gains more energy coming off the racket because it gains energy from the racket that has it's own energy that is transfered to the ball. Top spin on the ball causes it to go down because relative to the ground, the top of the ball is moving faster than the bottom so, air is flowing over the top faster, which causes the air to exert a force on the ball downward.
  7. MrMuffinMan

    Pink light?

    By MrMuffinMan,

    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
  8. MrMuffinMan

    Plasma Physics

    By MrMuffinMan,

    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. If they were to combine, the would turn back into a ordinary gas. In order to overcome the attraction of the charges for each other, there ether has to be large amounts of energy which is usually heat that keeps the particles moving too fast to combine or there is so much space between the particle that they can't combine which means they have low density. Here on Earth we use plasma to cut metals while on the sun, the plasma form of hydrogen combines to form helium and releases massive amounts of energy.
  9. MrMuffinMan
    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 test goes tomorrow. It's exciting to think that we only really have one more unit before the start reviewing for the AP but it's also scary realizing that in a couple weeks we're all going to have so much work to do getting ready for the AP.
  10. MrMuffinMan

    Solar Sails

    By MrMuffinMan,

    Currently the only way for us to get around in space is to use rocket fuel and chemical reactions to push the rocket around. This is very expensive and current rockets are 95% fuel by weight. However NASA is developing an alternative that uses the the sun to push the rocket around. These solar sails are made with large ultra-thin mirrors that use the light of the sun to push the sail around. These sails have to be reflective because when the light hits the said it has to be reflected. This they key because thanks to DeBroglie, we know that light has momentum and as the light changes direction it exerts an impulse on the said which accelerates the sail. Granted this force is tiny compared to rocket engines, but in space the the sail will accelerate as long as it sees sunlight which means it can go much farther without fuel on board.
  11. MrMuffinMan
    http://crazyarcade.wikispaces.com/file/view/dagobah_happy_wheels_DEMO.swf/182259727/dagobah_happy_wheels_DEMO.swf

    Before reading this you should play this game and warning it is pretty gruesome.


    This game has pretty good physics mostly although some parts of the game defy real life. For example the projectile motion is great because when you go off a jump or are sent flying by a land mine your body as well as the part of body that were probably blown off all have a parabolic path. Even the blood spurting out of your body follows projectile motion. You can also see that all objec
  12. MrMuffinMan
    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 few milliseconds before it's turned off in order to keep the block at a constant velocity. As the game goes on, the plate is left charged for longer which means the block reaches a faster speed. When the player presses the down button, the plate becomes negative charged again, causing the block to accelerate again. In order to move the block left and right, when the player press the left or right buttons the game creates a magnetic field. Since the blocks have a velocity downward, the magnetic field exerts a force on the block to the left or right. For example when the play press the right button, the game creates a magnetic field into the screen and by the right hand rule, the block feels a force to the right. And when the player presses left, it creates a magnetic field out of the screen which sends the block to the left. In order to turn a block, the game has to create two magnetic fields in opposite directions(one in, one out) that split the block in half(top and bottom). This creates a torque on the block that causes it rotate. Finally once a row has been filled, it completes a circuit that now has a current running though it. Behind the screen, there is a wire carrying current in the same direction and since wires carrying current in the same direction attract, the row is sucked behind the screen leaving space for the remaining blocks to slide down. Tetris may seem like it defies most laws of physics but we can see that it has to follow the same rules as all of us.
  13. MrMuffinMan
    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 few milliseconds before it's turned off in order to keep the block at a constant velocity. As the game goes on, the plate is left charged for longer which means the block reaches a faster speed. When the player presses the down button, the plate becomes negative charged again, causing the block to accelerate again. In order to move the block left and right, when the player press the left or right buttons the game creates a magnetic field. Since the blocks have a velocity downward, the magnetic field exerts a force on the block to the left or right. For example when the play press the right button, the game creates a magnetic field into the screen and by the right hand rule, the block feels a force to the right. And when the player presses left, it creates a magnetic field out of the screen which sends the block to the left. In order to turn a block, the game has to create two magnetic fields in opposite directions(one in, one out) that split the block in half(top and bottom). This creates a torque on the block that causes it rotate. Finally once a row has been filled, it completes a circuit that now has a current running though it. Behind the screen, there is a wire carrying current in the same direction and since wires carrying current in the same direction attract, the row is sucked behind the screen leaving space for the remaining blocks to slide down. Tetris may seem like it defies most laws of physics but we can see that it has to follow the same rules as all of us.
  14. MrMuffinMan
    The greatly feared captain of the pirates "Schalkimnack" was not only famous for his cruelty but also for baffling his prisoners with difficult brain twisters. This is one of his favourite riddles:
    Schalkimnack took a gold coin an throw it overboard into the sea. He asked:
    "Did the sea level ...
    a) rise,
    sink or
    c) stay like before?"

    If one of the prisoners could solve the riddle, he was set free, but in case of giving the wrong answer, he was thrown to the sharks. Legend relates that until now, nobody could manage to solve the riddle.
    Now you've got caught by Schalkimnack!

    Can you solve the riddle?



    website for this riddle
    http://physik.ph-gmuend.de/brain-teasers/
  15. MrMuffinMan
    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 them and then expected to know the derivation as well as the equation. I'm a little afraid of Electricity and Magnetism because mechanics were easy to visualize which makes understanding easier for me, but when we're talking about tiny electrons, it's not so easy to picture. But hopefully it won't be too bad.
  16. MrMuffinMan
    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 object that we can't stop and an object that we can't move. In both these cases the object would have to have an infinite mass that way any force applied to?this object wouldn't accelerate it at all. And so when they collided since they cannot be accelerated, the only thing that could happen is that they pass right though each other.



    ps
    What movie am I talking about
  17. MrMuffinMan

    Work

    By MrMuffinMan,

    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 more is reflected back. This difference in distance travel creates a phase shift which can be used along with the index of refraction of the material to calculate the thickness. I don't really understand works but I'm sure I'll learn all about it when I start work.

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