| Academics > Academic Departments > Science > Physics Photo Contest 2012 > Entries 1-7 >
|
|
|
|
|
| |
Entry 1: Rami Bedewi |
 |
|
 |
|
|
In physics, energy is defined as the capacity of a physical system to do work. Energy is stored in different forms including kinetic, mechanical, electrical, chemical, heat, etc. One of the fundamental properties of energy states that energy can never be created nor destroyed meaning that it is only converted between forms. In the photo, there is a Rubik’s Cube that has a spring-loaded core to which all the pieces are connected. By twisting multiple sides simultaneously chemical energy from my body is being converted into spring potential energy in the core. After a certain point, the springs can no longer compress resulting in a release of the stored energy demonstrated by the explosion of pieces. The spring potential energy has been converted to kinetic energy in the pieces causing them to shoot off the cube. In this case the spring is doing work on the pieces that in turn enacts the force on the system that causes to pieces to fly off.
Source: http://physics.about.com/od/glossary/g/energy.htm |
 |
| |
Entry 2: Mario Belledonne |
 |
|
 |
|
|
The image is small pools of water on top of a plastic plate placed above a speaker. This is what happens when compression (longitudinal) waves are converted to transverse. What humans perceive as sound actually is compression waves of air traveling through the atmosphere. Sound wave, like any wave has amplitude and frequency. Frequency is the amount of compressions per second which controls how high or low pitch the tone sounds and is measure in Hertz. Amplitude is how much energy is used to push the air molecules together, therefore affecting the volume. Volume is measured in decibels. Wavelength is the amount of distance covered in every cycle, however this depends on the medium in which the wave is traveling through and at sea level the speed of sounds remains relatively constant. The picture, however, looks nothing like a compression wave. That is because as the sound wave traveled perpendicular to the plastic plate, it caused the plate itself to become a diaphragm. The diaphragm transferred the energy from the longitudinal waves to transversal waves in the water due to an effect from the sound wave called resonance. Resonance occurs when the frequency of a wave matches the natural frequency of a medium. After sweeping frequencies at reasonable decibels, I found that the resonating frequencies for the plate ranged from 80-200hz. The pattern present in the water is due to the nature of the tone. The computer program I used to generate the sound emitted a sinusoidal tone. The sinusoidal tone has a uniform pattern causing symmetrical waves radiating from the center. If viewed from a horizontally parallel view, the ripples in the water would resemble the shape of the sine graph. The higher frequency scenario (200hz) causes more rings in the picture because of the amount of waves per second cycling per unit of distance. However, the transversal waves are also “standing waves” and do not actually move the water molecules horizontally, rather a back and forth manner in parallel with the source. That is why the water pool doesn’t spread across the plate. |
 |
| |
Entry 3: Ron Busby |
 |
|
 |
|
|
Air Pressure: For my picture it simulates the same pressure one feels for every square inch of pressure ob their bodies at sea level. Each person feels 14.7 psi and face thousands of pounds, yet people are not crushed under that pressure. The can in the water was partially filled with water and heated on a hot plate until the water inside began to boil. Inside the can the water vapor, or steam, has fills the can instead of normal air that took its place before. Putting the can into cool water will instantly cool the water from water vapor and the ca will be almost empty with very little pressure to force outwardly on the outward pressure we all as people have acting on us constantly.. Under this the can is crushed is pressure almost instantly with a loud pop. The pressure of the air around it crushed the can. |
 |
| |
Entry 4: Jack Canavan |
 |
|
 |
|
|
This photo shows two scenarios I created that are often considered impossible. In reality, both balancing a soda can at an angle and holding a quarter on a dollar bill are possible but both scenarios rely on one principle: the center of gravity. Most people attempt the soda can experiment with an empty can. This is why they find the task impossible. When the can is empty the center of gravity is too high which in turn causes the can to fall over when balanced. To properly place the soda one must drink about two thirds of it. The remaining liquid then fills the can in a shape which creates a low center of gravity allowing the can to balance. Balancing a coin on top of a dollar bill is similar in that you have to change the position of the object to achieve the proper center of gravity. However, instead of finding the correct amount of liquid in the soda can I had to find the proper position for the coin. In order to do so I folded the dollar in half and made a V shape and then placed the quarter on the vertex. I slowly stretched out the dollar and while doing so the coin adjusts its center of gravity to stay on the vertex therefore balancing on the thin dollar bill. These two scenarios were set up but are real and do utilize physics in many different ways. |
 |
| |
Entry 5: Nick Guthrie |
 |
|
 |
|
|
Sunset, Rich With Meaning: Here we have a wonderful picture of the landscape on the other side of the golf course. It has just finished raining and the sunset is in full swing. The colors created by sunsets are fascinating. Color comes from light, which is on the electromagnetic spectrum. Beams of light contain different energies that our eyes then interpret as certain colors. When the sun, it shines waves of energies containing lots of colors (different frequencies), but that light has to pass through the earth’s atmosphere before it gets to us. Because the sun is closer to the horizon, the sun’s light passes through more before reaching our eyes. This scatters away the shorter waves that appear blue, and the longer ones that appear red, orange, and yellow are able to shine through instead. The waves of energies in light (which each appear as a certain color) aren’t all the same energy, which gives us different colors. At sunset, when the light’s path through the atmosphere is longer, the blue and green components are removed almost completely. This leaves the longer wavelength (orange and red hues) to be seen. Also, there are more particles at sunset than sunrise which causes sunset to be a more spectacular experience. |
 |
| |
Entry 6: Gun Joong (Mike) Kim |
 |
|
 |
|
|
Last winter, I finally bought a smartphone. One cold day, I went out to hang around with my friends. In front of them, I tried to show off my new cellphone. However, it didn’t work as I was wearing gloves, and I felt embarrassed. Why does only human touch or finger work for touching a smartphone?
Nowadays, most smartphones including iPhones have electrical touchscreens. In detail, a capacitor is an electrical circuit composed of two conductive electrodes separated by an insulating gap. A direct current (DC) of electricity can’t go through this gap, but an alternating current (AC) can induce a charge to flow from one side to the other. The surface of a touchscreen is covered with a grid of electrodes. Wherever our finger touches the screen, a capacitive contact is formed and the alternating current (AC) generated within the device induces a corresponding current within our body, helping extend the gap and complete the circuit.
In fact, good conductors also work for touching a smartphone. Unexpectedly, one of them is encased sausage. During last spring break, I saw a Youtube video which shows a Korean woman using a stick of packaged sausage as a stylus for a smartphone. Amazingly, it works as pretty well as our finger. As I said above, touch screen on a smartphone utilizes the electrical conductivity of our finger to locate the input. It is possible for this packaged sausage to work on a smartphone because it has the same conductivity as human body or finger. This sausage is electrostatically compatible with a smartphone’s capacitive touchscreen, and so it is probably one of the best and the cheapest styluses for a smartphone nowadays. |
 |
| |
Entry 7: Eung Keun (Tony) Kim |
 |
|
 |
|
|
When two people move a heavy stuff to an upper floor through a stair, one in the lower position seems to put more force than another person in the upper position does. (As you can see that in the photo; I am frowning and Joon is smiling.) Some people may think two people are giving the same amount of force in moving stuff, but it is not true. Let’s have three assumptions; that the bed weights 100 N, one side of bed is twice of the other side, and we are in 45 degree incline. The total torque is equal to zero; torque force from my position and torque force from Joon’s position have to be even out. If the force A, which I am giving in order to move, is equal to weight of the bed X three quarter of long length cos(45)/a full length cos(45). It will come out to be three quarter of 100N. So, I am giving 75 N and Joon is giving 25N. In conclusion, a smart man will be on the upper position. |
 |
|
|
|
| |