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  1. Many of us enjoy looking at optical illusions, but why do our eyes lie to us?????

    Although each illusion has it's own reason, and scientists still don't know all the reasons, it comes down to one thing. Our brain makes assumptions.

    Our brain uses context of our surroundings to make split second assumptions. This is helpful in everyday life and back when we were hunters and gatherers and needed to make split second decisions in the wild. Our eyes don't show us what's really there just what we need to see. It uses the surrounding environment to make conclusions. This is done by using shadows, surrounding colors, and past experiences.

    optical illusions are just a case of your brain telling you what you should be seeing, not what is actually there.

  2. jfrachioni
    Latest Entry

    i thought because i started my bloggery with a prediction and outlook of the course, that i should end it all with an analysis of the year. my thoughts on Mr. Fullerton as a teacher are that he is great at explaining things, and teaching in general. the course is very difficult, and he makes it easier to handle. i also think independent units are a good thing, and that they should be continued. as for blogs, i definitely think writing can help cement understanding of physics concepts, however my opinion is that there are less painful ways of doing so than writing blogs. although I only took half a year of calc, i found the material i learned in that half was more than enough to carry me through this course, yet a whole year would have probably provided me with an even better understanding of this material. i think there should be more projects, contests at the end of the year, and less kerbal, although the kerbal program was extremely educational and interesting, so the best thing may be a balance of the two. all in all, its over and im looking forward to college.

  3. when you put a shovel on an old picnic table in your backyard and a leg of the table snaps, it's time for a new table. Problem is, the table can't be thrown away or used for firewood (some parts are just too rotted for anything put the garbage) as it is. It had to be taken apart. The first thing I did was pry off the crossbeams on the table's underside. The crowbar had to be placed at a 90 degree angle and then hammered underneath the crossbeam and pulled. The trick was to make sure the sideways pressure on the crowbar was transferred into the right place. Without something holding the main beams in place, the crossbeams would just pull up the main beams, because energy is always transferred and an object in motion (the main beams nailed to the cross beams) will remain in motion unless acted on by an outside force (my foot). With nowhere else to go, the nails where forced to separate from the board. Next I had to brake up all the beams with an ax. the acceleration of my ax would transfer onto the board, driving the head into the board. The motion I made with each swing was a half circle. sometimes the force would be so great and the wood so rotten, the energy would be transferred too fast for the board and it would break on the first try! These demonstrate two basic laws of physics: an object in motion will stay in motion unless acted on by an outside force; and energy will never be destroyed or created, only transferred. That table sure was destroyed though!

  4. blog-0904411001368811827.pngWe all know Star Wars right? A common theme is battles in space with big ships blasting at each other. However, if the movies were based on actual science, you wouldnt hear anything. There's always big booms and laser sound effects, but if you think about it, sound cannot travel through space. Sound is a longitudinal wave, and can be looked at as such:

    ::: : : ::: : : ::::

    Longitudinal waves need a medium to travel through, and since space is nothing more than a vacuum, there is no medium, and therefore no sound could travel. Then Star Wars would be really boring, huh? Good thing George Lucas neglected his physics class. You should't though!

  5. redsoxnation18
    Latest Entry

    Now that physics has come to an end, I understand a ton of information that will now always spark into my mind on a daily basis just by doing normal things. For instance when ever I throw a baseball I can't he but to think about different factors in projectile motion, like why does the ball fly the way it does and how can I get the ball to go the farthest with the right angle. Physics is everywhere and in everything and if you know a little physics then you will notice it a lot.

    This year we learned about all kinds of physics concepts and we did all kinds of experiments. Some of my favorite topics were the topics that made me think like quantum physics. I also loved our projectile motion unit because at the end of the unit we got to build catapults.

    My catapult was a mixture between a spring firing catapult and a trebuchet. The way a trebuchet works is by heavy weight dropping to rotate the catapult arm swinging a long sling and propelling an object. Instead of the weight, my group decided to use springs and bungee cords to put the arm and sling into motion with great force and it truly worked better than we expected.

    The first test shot went over 60 meters, but being the way I am, I had to see if it would go farther. Joe F. and I changed the sling release angle to as close to 45 degrees as possible to see if it would make the softball go farther. We also experimented with other objects like apples and baseballs. The apples flew very inconsistent and the baseballs flew very far, much farther than the softball because off the less air resistance. We also tried making a baseball wet and heavy to see if it would change the distance but it didn't change much at all.

    On the day of launch my group, Roxy, Joe, Andrés and I broke the school record and launched a softball a whopping 82 meters. I didn't now that it was going to go that far. I learned that if you put in 110% effort, anything is possible to achieve. This was a very fun and memorable part of my physics year. Thank you Mr. Fullerton for a great year of physics class!

  6. blog-0776171001429219758.jpgDuring my pursuit of wormhole knowledge, I came across an article by Stephen Hawking discussing his research and opinions on wormholes and travel. I actually found the article quite interesting (and even humourous!), and felt that his findings should yield a separate blog post.

    While Hawking definitely believes the data that wormholes exist as a connection between different parts of spacetime, he definitely does not believe in time travel using these wormholes... ever. He states that most wormholes are only billionths or trillionths of centimeters long, not nearly large enough to fit a human, let alone an entire space crew. Wormholes are far too unstable to enlarge by any means, he believes, and even if humans could create a wormhole, it would be far to unstable to leave open long enough to travel through.

    Stephen Hawking is also a strong believer in paradoxes. He believes paradoxes caused by wormhole travel are one of the major reasons it could never work, even if the wormhole was large and stable enough to travel through. His example demonstrating paradoxes in wormhole travel involved a scientist looking back at himself minutes earlier through a wormhole; if he decided to shoot himself, who would be the one shooting? It would be a paradox. And this type of paradox is why time travel through a wormhole could not work. It would violate the very theory that cause comes before effect, the theory that governs the universe. In the end, the universe would descend into chaos if time travel through worm holes was possible. And according to Murphy's Law, if that could happen... it would.

    Hawking also points out that feedback would prevent wormholes from long term existence. As a wormhole expands, it would suck in more natural radiation, which would create a loop of radiation absorption that would eventually cause the wormhole to collapse.

    However, Hawking does see time travel using a black hole as a more possible alternative (although not entirely possible). At the center of the galaxy lies a supermassive black hole, and the gravitational pull around it is so strong that it slows time around it. Flying a space ship around the black hole would cause time to move substantially slower for passengers, which would make the crew travel into the future as they return to Earth. However, it is difficult to do so because the ship would have to travel the speed of light to avoid being sucked into the black hole, which is 2,000x faster than the fastest human space travel. If this were possible, however, there would be no paradox.

    Space travel is quite the debated topic in the science community! I will leave the link at the bottom, since it is an excellent article with some fascinating information! Until next time, Fizzix communtiy, until next time.

    blogentry-1411-0-96092500-1429219746_thu

    http://www.dailymail.co.uk/home/moslive/article-1269288/STEPHEN-HAWKING-How-build-time-machine.html

  7. So today we had our Regents exam and I had yet to complete my last blog post. As I was sitting and waiting to be dismissed, I was thinking about how hungry I was (as usual). It then occurred to me that physics was involved in my hunger! How do you ask? Let me explain.

    Well, starting with last night, I had lacrosse practice. This required me to use mechanical energy. I then slept to regain my mechanical energy from chemical energy. I then added more chemical energy by eating some chicken pot pie for breakfast. This energy was then converted to mechanical energy so I could take my Regents exam this afternoon. Once I had exerted all of my stored energy, I was hungry for some more chemical energy. Thus, I needed more physics.

    Not everyone immediately associates being hungry with physics, but as a successful and educated physics student, it was the first thing I thought of!

  8. evan
    Latest Entry

    Population concerns on Earth are leading scientists to inquire whether colonizing Mars is possible. As of now, over 78,000 people have applied to leave Earth forever and live on Mars. Mars One, a nonprofit organization, is sponsoring the colonization with a take-off date sometime in 2023. Out of the applicant pool, four will be chosen to send first to Mars. The first four will lay the groundwork for a permanent colony. Two years after the first four land, Mars One would send up more people to the colony. With the application process underway, it seems as though scientists have discovered ways for humans to survive on Mars indefinitely. However, this is not the case. Many, many concerns exist such as how will the colonists feed themselves? Will crops which grow on the Earth also grow on Mars?

    The first settlers of Mars will most likely be farmers. Yes, they will be astronauts; but, if survival is of any importance to them, they will learn to farm in order to eat. Research which has been conducted supports the idea that growing crops is possible in microgravity. However, those working for NASA do not know to what extent the gravity of Mars will effect crop growth. Also, Mars' surface only receives about half of the sunlight that the Earth's surface receives. Will plants be able to grow with limited sunlight? On top of the already limited sunlight, pressurized greenhouses would be necessary to grow crops. The greenhouses would block out more light. So, additional light would be necessary from other sources than the sun. What would power additional light sources? How would that power be generated and sustained?

    Radiation would also be a problem faced by those on Mars. Mars does not have as strong of an atmosphere as the Earth. More radiation reaches the surface of Mars than the surface of the Earth. Inhabitants would need a way to reflect the radiation or shield themselves from the rays.

    To live on Mars, man must master the art of agriculture in microgravity. Feeding the inhabitants of Mars is one among many more necessary tasks of survival. As of now, research is still being conducted. The 78,000 who have already showed interest in living on Mars are a bit stupid or extremely bold. With current technology man would not survive on Mars. I do not doubt though that technology will develop in the near future for man to successfully live on Mars.

  9. For my final trick, a blog post about blog posts! The assignment of blog posts, 10 a quarter for four quarters, has been a great way to make us think. It seems fitting to reflect on the blog post process itself with this fortieth post. I really think this is a good idea, whenever I sit down to do a post I enjoy the creativity involved, and reflecting on what I've learned makes me appreciate the scope of the class all the more. I definitely recommend that the blog posts remain as an assignment, and I am glad to have had the chance to think about physics on my own and through that process get to know it better.

  10. Relahi
    Latest Entry

    There is a trick guitar players use where they lightly tap a fret while plucking the string and making a high pitched noise. This is commonly called "playing harmonics". However even without any fancy tricks, a guitar player is playing harmonics. In order to understand this we need to know some basic physics on waves.

    When someone plucks the lowest string on a guitar, you hear an E. You may think you are hearing just that one sound, but really you are hearing multiple harmonics and overtones combining to make that note and pitch. The dominating sound is the fundamental, this is the pitch we can hear.

    A plucked guitar sting is a standing wave with two fixed points. The tension, density and length of the string all determine its note and pitch. waves travel slower on a more dense string and faster on a thinner string. This produces a lower pitch on the thicker strings and a higher pitch on the thinner ones. There are non-vibrating points on each string called nodes. a trick often used by guitar players is to lightly tap these nodes (found on the 5th, 7th, 12th and 19th frets), changing the length of the string and isolating one particular harmonic. This makes a high-pitched sound and raises the octave, depending on which harmonic is used.

    To isolate the first harmonic pluck the sting and simultaneously tap it at the 12th fret (it takes some practice). The wave is divided in half which doubles the frequency and the note is brought up one octave. This blocks the fundamental and makes the first harmonic dominate. This has to do with modifying the length of the sting, therefor changing its frequency, the speed of the wave and its pitch. The length of the sting (L) is equal to 1/2 of the wavelenght. L=1/2(wavelength).

    Blocking the string on the 7th or the 19th frets will divide the string into thirds. This time, both the fundamental and the first harmonic are blocked and the second harmonic dominates. This raises the note two octaves (L=2/2wavelength). The same thing occurs at the 5th and 24th frets but the string is divided into quarters, the fundamental, first and second nodes are blocked and the third harmonic dominates, raising the note three octaves (L=3/2wavelength).

    The attachment below is me playing the fundamental, first, second and third harmonics (respectively).

    video.wmv

  11. The European Organization for Nuclear Research known as CERN was founded in 1952. Since then more than 80 countries have been contributing to the research done in the particle accelerator and trillions of dollars have been invested. Many argue that the money spent could have been invested in humane projects rather than spending it on research of tiny particles in huge machines under the ground that go through multiple countries. But most of us don’t know the great benefits the research provided us in the past years which greatly justifies this investment. The research provided the discovery of cancer therapies, monitoring nuclear waste, helps to save tons of electricity in power transmission, the discovery of the MRI, and the greatest of all a better understanding how our Universe works.

  12. This is by far one of my favorite tricks to do along with butterfly kick and butterfly twists, (they link up really easily) but a parafuso actually shows how well the human body takes linear momentum and converts it to angular momentum but adding the upward force.

    The ginga (pronounced like jinga) is the building and wind up guard of this martial art. it has the leg back on one side and the arm back on the other. This basically gives range of motion to throw parts of the body into motion with more anticipation and control. But the first thing you'll notice is the 180 turn before he jumps. This turn causes the initial linear-angular transition as the hips are bent forward. Next he throws his arms into the angle to gain momentum from their mass, and the legs are swung around until either both can land (regular) or the first leg to take off is tucked back and you over turn the kick into a 540.

    This trick is done 'perfectly' when the middle of the kick can be as far back as if one were lying down, where the transition from linear to angular momentum would be the most efficient, and also where the most height can be reached by the kick itself, allowing the momentum afterwards to carry through to the next motion.

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    The most renown example of waves are ocean waves, however, microwaves serve as another example and daily appliance that showcase the physics of waves. Out of all the frozen foods on the market, Pizza Rolls are my favorite dominant after school snack. When microwaves warm up your food, friction heats up the water molecules in the Pizza Rolls. In turn, this produces heat inside the apparatus. Furthermore, microwaves have a predetermined and set frequency. Microwaves are hot for physics!

    20130206-totinos-cooked2.jpg

  13. Everyone loves to jump on trampolines. They are just so much fun! But do you ever think about the physics behind the fun activity? The physics involved in jumping on a trampoline is elastic potential energy. There is elastic potential energy because there are springs all around the trampoline. Elastic potential energy is equal to one-half times the spring constant times the amount of compression squared. To find the spring constant or the amount of compression, you must know the other and the force of the spring and plug it into the spring force equation which is Fs=kx. Once you know both k and x, you can find the amount of energy stored in the springs by plugging them into the elastic potential energy equation. Now you can figure out how much energy is stored in a trampoline before you jump on it!

  14. Sampapaleo12
    Latest Entry

    Double domino's are relatively hard to explain so you should watch the video to get a good idea of what it is. 

    This is possible because the bricks are very wide. when the bricks fall, they lay on top of the one before it. the last brick in the sequence does not have anything to lay on so it falls to the floor. this causes the brick that is laying on it to fall as well and the next brick to fall and so on. This happens only when the bricks are placed a certain distance away from each other. this distance cant be too close or the bricks will just rest on top of each other. this distance also cant be too far away or the bricks will lay flat on the floor after hitting. Untitled.thumb.png.ba95da2ff1d630a31fa1bd6d9466c4c2.png

  15. There has been a firm belief throughout my life that yawning is contagious, meaning that if you were to see someone yawn, it would then cause you to yawn as well. This is in fact true.

    Despite many believing it was only a myth, yawning is contagious. Yawning itself is your bodys way of telling you that you need more oxygen. It does not in fact have to do with being tired although it is associated with it. You could be wide awake and yawn just because you need more oxygen. the common belief behing contagious yawning is mirror neurons. For those of you who have taken psychology you should understand this concept, for those who havent, let me explain. Mirror neurons have to do with the saying "monkey see, monkey do". Throughout development these mirror neurons allow you to watch someone do something and then repeat it ourselves. So when seeing someone yawn, the mirror neurons inside of your brain become active and actually replicate the same behavior causing you to yawn.

    People-Yawn.jpg

    If you were to look at this photo long enough you may feel a yawn coming on yourself.

    Yawns are in fact contagious, but you don't always yawn because you're tired, but because your body needs more oxygen.

  16. As for many instruments resonance, or the vibrating due to an equal frequency, causes the sound. For an opera singer to break a glass with just his/her voice they would have to match the frequency or pitch that they sing at to that of the glass. When the opera singer hears the frequency of the glass, being trained they can match it to the sound that comes out of their mouth. This causes the glass to vibrate and eventually shatter once the pitch is perfectly met. For a guitar, the strings are what causes the music. When you put your finger on a string and shorten the wave length, the frequency then increases and you get a higher pitch out of that cord. This is true with most instruments such as trumpets, trombones and pianos because as you slide or press, you shorten or lengthen the wave length and in turn are changing the frequency...without physics, music wouldn't be possible!

  17. Now that physics has come to a close, I think my last blog post should be about what topic interested me the most throughout this past year! Although physics by far was not my favorite class, there were definitely units that were actually quite amusing. Through this year we have learned about friction, kinetic energy, waves, potential energy, newton's laws, and tons of other things. But the one that stood out from all the rest was electricity.

    In the electricity unit, we had many cool labs that were very interactive, and I learned many things that I never knew about before. For example learning about conductors was pretty cool, learning about what materials allows charges to move easily and which ones do not was expressed in one lab where Mr. Fullerton laid out different types of conductors and my group had to figure out which one's where conductors and which ones were resistors. This was fascinating to me because I never knew how many different conductors there were and how to really tell the difference between a resistor and a conductor. A resistor is said to be the flow of charge itself. Conductivity and resistance definitely goes hand and hand, without one another neither would exist.

    Coulomb Law-looks at forces created between two charged objects. As distance increases the forces and electric field decreases. In order to show this successfully, Mr. Fullerton arranged magnets at different tables and we experimented by bringing the magnetics closer together then separating them further and further apart. By doing so, we could see that the closer the magnets are to each other the greater their force and vise versa, which was appropriately explained throughout Coulomb law.

    AC & DC current- this topic was very interesting to me because I never learned about it before and it was actually quite interesting. There are said to be two different types of current in the world, one being direct current which is a constant stream of electrons in the same direction repeatedly, and alternative current which are charges that reverse direction. What was also interesting to me was the electrons can only flow if there is a current, I thought that electrons just always continued to flow but in reality they need a current. AC currents are used more around the world then DC current because its cheaper and easier to increase and or decrease the amount of energy. Most of the appliances in our homes are used with AC, DC is very unlikely to find. However you can also change DC to AC with some power converters as well.

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    When you throw a football to someone you wont think about physics but physics is happening everywhere. You will make adjustments for everything before you throw the ball. You will make adjustments to your head for factors like how hard you have to throw it or the angle you have to throw it depending on how far away your target is. This is all physics but you dont realize it because you do it naturally in your head.

    Whenever you throw a football there will always be a parabolic path because the movement of the ball in the virticle direction is influenced by gravity. As a football travels up, gravity will slow it down until it reaches its peak, then it will stop briefly at that peak. Then the ball will start its acceleration back to the ground because of gravity. This path the football takes is called its projectile motion and here is a picture of what it looks like.

    20092281136226337141778225000003208.jpg

    Some equations you can use for situations like this are

    vf=vi+at

    d=vit+1/2at^2

    vf^2=vi^2+2ad

    Ay=Asin0

    Ax=Acos0

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    Most people consider cheerleading a weak activity that requires girls dressing up in cute uniforms and waving around pompoms. However, cheerleading is an intense sport that requires practice, dedication, and knowledge of skills. Just like any other sport, physics is involved in cheerleading 100%. Physics is found in every single motion and stunt. Cheerleading is based on stunts, tumbling, and jumps and since physics is so involved in this sport it makes this sport actually exist.

    A main factor of physics found in cheerleading jumps is force. Newton's Third Law states that for every action, there is an equal and opposite reaction. This relates to cheerleading jumps because as the cheerleader is jumping into the air there is a force being applied which makes the force of gravity react, bringing the cheerleader back to the ground. To increase the height of the cheerleaders jump, they must increase the momentum to get the highest force. Momentum equals mass times velocity, so if you were to increase the amount of mass that is acting against gravity and increase the speed of the jump the momentum would be larger giving the cheerleader higher jumps.

    In cheerleading there are multiple stunts that require alot of skills. The main factor of physics that affects stunting is gravity. In a stunt there are mainly four people, a flyer, two bases, and a back spotter. The flyers center of gravity may change based on how many people are holding her and what kind of stunt she is performing. If two bases are being used to hold the flyer, the flyers center of gravity would compare to those that are holding her. If she were to be doing a one legged stunt then her center of gravity would differ and it would counterbalance the other side that is being pulled to the ground. Gravitational acceleration is another form of physics found in stunting. When a flyer is being thrown in the air she reaches a maximum height which allows her to perform the movement in the stunt. One’s maximum height is the highest that object can go, because its velocity has reached zero. If the flyer does not wait to reach their heighest point then it can cause her to come down early and possibly hit the people who are holding her as she is coming down.

  18. gcaso
    Latest Entry

    Have you ever been in the car sitting at a red light and you know the person next to you wants to get in the same lane as you? If you are a nice person you may slowly accelerate and let them in ahead of you, but like a lot of drivers will accelerate just as fast (if not faster) and try to eiether keep them in their own lane, or get past them so that they enter the lane behind you.

    This situation I have just prefaced you with is, essentially drag racing. However, there are many other components to drag racing than just a quick acceleration, experienced drag racers will use a wide range of strategies to gain the edge over their opponents (on a closed track, of course!)

    The first thing that racers usually upgrade or modify, are the tires of their cars. Stock tires have a tread on them, the more tread there is, the less surface area there is. This results in less grip which can slow cars down by a couple of hundreths of a second, enough to lose a race and frustrate any racer.

    blogentry-557-0-42592200-1370052461_thum

    This is a drag racing tire known in the racing world as a "slick"

    Another major component also comes from the tires. You may think a burnout is just unnecessary wheelspin, but actually what the racer is doing is heating the tires up. This makes the tire softer by nature and it conforms to the track a lot better, again giving the racer more grip.

    Another common misconception of drag racing is the function of the spoiler. No, no it does not try to make the car fly, nor does it just look pretty. Well, some do just look pretty and aren't very efficent, but thats not important at this point. The fact is, is that spoilers are placed in the rear of the car. They are angled so that in some way, it pushes the air going through it, from the bottom to the top. The air pushes against the spoiler with a force, n. Some of this force is then directed directly down and more pressure is pushed onto the tires, forcing more grip action.

    blogentry-557-0-07470100-1370052688_thum

    Have you noticed a trend here? I have, Drag Racing is all about the grip of your tires!

    Here's a little something to satisfy the inner speed demon. (Mustangs are better!!)

  19. Originally this post was going to be written as a play and emulate shakespeare but it's so hard to use blank verse and iambic pentameter when words like acceleration take up half the steps per line, It's as if physics wasn't designed to be performed by a theater troupe I mean seriously Newton? Where's your artistry bruh bruh? Needless to say my original plan failed rather colossally so I'm just gonna present the gist of what the play would have been and break down the physics behind it. The curtains open to a library where leibniz and newton are having a heated debate over the credit for that whole weird calculus thing. Keep in mind it's a library so all of this happens with a minimal volume. The argument escalates rather violently and the two draw up arms. While they fight they literally shout-whisper out the physics and calculus of what their doing. Lines like "i strike thee with a great velocity"or "thou shall cease to have energy kinetic nor potential!"

    Anyway the play will be funny when i finish it for my blog next quarter. But for now I'll discuss the physic of two calc geniuses beating each other silly. You see each time one hits the other their built up momentum that goes with their punch becomes a major impulse delivering a huge force in minimal time, performing work on things like newton's teeth when their position is rather drastically shifted. When they presumably throw the library books at each other the projectile motion has to be accounted for, the velocity of a book thrown by newton will hit leibniz with a great reduction due to drag forces and the acceleration due to gravity.

  20. Slinky's can perfectly represent the concepts of basic waves. First, if one person yanks the slinky to the left then quickly back once, a pulse is created. If they do this repeatedly, a wave is created. By making bigger waves, the amplitude will increase and by making faster waves, the frequency increases. If the person at the other end of the slinky decided to create waves as well, interference occurs where the two waves meet. If the waves are produced on the same side of the slinky, constructive interference will occur, creating a bigger amplitude where they meet. But if the waves are produced on opposite sides of the slinky, destructive interference occurs where displacements negate each other. By performing different experiments on slinky's, we can observe how waves work by manipulating their characteristics, observing physics in real life.

  21. When your driving a car physics is involved. If you had a blow horn and blew it out the window while you were driving and someone was standing outside of the car and as the car drove away the frequency would decrease compared to the frequency and amplitude would be the same way as frequency it would be higher as your closer and lower as your farther away or as the object goes farther away. The wave created from the blowhorn would be sound wave which is considered longitudinal wave. Also another part of physics that is connected to a driving a car is kinematic equations as well as ramp inclines depending of the car is going up or down hill

  22. AliciaDAnnunzio
    Latest Entry
    blog-0608441001397095867.jpgTibetan singing bowls are similar to humming crystal glasses. A mallet is used to vibrate the metal bowl by sliding along the edge in a circular motion. This creates a standing wave. The bowl acts as a resonating chamber, each edges' wave reflects off of the opposite side; which gives it it's unique sound. If the person controlling the vibrations does it gently enough and at the correct speed, the frequency remains constant while the amplitude will most likely increase. An increase in the speed of these pulses can create an increase in frequency and vise-versa. A difference in the medium, such as having a different size or kind of metal, can also affect the pitch of its hum. This is how Tibetan singing bowls work.
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