So, as I was sitting at my computer, trying to figure out what to write for this week's entry, I happened to notice that the screen of the Mac computer was acting like a mirror. I could see the part of my house that was to my left. The incident ray of light bounced off the computer screen, and the reflected ray traveled to my eye, allowing me to see the image in the picture. The image appears as far back as the actual scene is from the computer screen. The image is also actually behind the "mirror", as we learned in class. As you can tell, I'm kind of running out of things to write about...

In the picture, the yellow egg that Madi is holding appears yellow because the red and green cones in our eyes are stimulated. Since the sunlight is made up of red, blue, and green light, to appear yellow, only the blue light is absorbed while the red and green light is reflected. At Easter, I also remember that my cousin put his egg in every single color of dye, and it turned a really disgusting brown. Thanks to physics, I now know that mixing paint colors and light colors are different. In that lab we did, when we combined all the colors, the paint also turned an equally gross-looking brown. Only if you mix magenta, cyan, and yellow LIGHT together, will it produce black.

In order to celebrate my LAST ORCHESTRA CONCERT, I guess I will do a journal entry on the physcis of playing the violin...When you pluck or bow a string on the violin, you create standing waves. If you place a finger on the string (like I did in the picture), you shorten the length of the string, decreasing the wavelength but increasing the frequency of the fingered string. Playing a note an octave higher means you doubled the original note's frequency. When you tune, you also try and match the frequency of the note being played so that you don't hear beats. Playing a piece "spicatto" even involves torque because you must play the notes at the bow's center of mass so that the bow can rotate and move freely.

This is a metronome (obviously). Besides setting a steady beat that helps me to play my violin in tempo, it also has a setting that plays the note A which allows me to tune my instrument. I never realized this before, but on the dial, right below where it says "A", it says 440 Hz, the frequency of the note A (!!!). This past week of physics has also made me realize why tightening the tuning pegs on my violin increases the pitch of the string. The wave speed of the string increases with the increase in tension. By winding the string around the tuning peg, I am increasing the tension of the string and increasing its wave speed. Increasing the wave speed of the string also increases its frequency. This higher frequency is picked up by my ear as a higher pitch.

This isn't the best picture, but I had to (yet again) post another picture of a lame ticket stub because I forgot my camera (!!!). So, this weekend I went to the Chris Tomlin concert with my Youth Group from church. It was my first time at a, umm, "religious" concert, but I was surprised to find that I enjoyed it. The electric guitars used electromagnetic induction to produce the music. A permanent magnet magnetized the guitar strings so that when the strings vibrated back and forth near a coil, it induced an emf in the wire. The current in the wire created a signal which was transmitted to the loudspeakers to amplify the sound. I could hear the music because of sound waves which were created by the oscillation of the loudspeakers. When the sound waves reached my ear, they vibrated my eardrum, generating signals that were transmitted to a part of my brain that interprets them as sound.

So after we did the Genecon lab this week, I finally figured out that this pig flashlight is not just a normal flashlight...It's a generator too! I always used to wonder why it had this weird handle-thing that occasionally popped out of its side. Thanks to the lab we did this week, I now know that the handle probably makes a magnet spin past coils of wire (or vice versa) that are connected to the lightbulbs in its nose. The change in the magnetic field induces a current that allows the bulbs to light up. This is an example of a generator and a motor (I think).

This is obviously a picture of my ticket stub from the Cartel concert I went to this weekend. I only posted this lame picture because I didn't want to take my camera into the mosh pit and get it trampled and ground into tiny pieces. Being in the mosh pit is pretty fun except for the fact that there are random people bumping into you with their sweaty bodies. And there is the potential hazard of getting kicked in the head by people who are trying to crowd surf. The crowd surfers actually became human projectiles. They were launched by people in the back and caught by the security guards in the front. It actually looked pretty fun...With people pushing me from all sides, I kind of felt like an electron in a wire with too much current :) Corny analogy, I know...Anyways, all the momentum from the people in back of me also propelled me into the person in front of me, creating this big chain reaction of forward motion. My friend actually fell down twice because she had too much momentum carrying her forward but no one in front of her to pass it on to...