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jcstack6 last won the day on October 1 2016

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About jcstack6

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  1. In high school physics we've always been told that test will try to trick you. They'll ask if a 10kg person goes from the earth to the moon how will their mass change. And the answer is always it doesn't. Mass doesn't change, mass doesn't change, mass doesn't change. It's been hammered into our brains. But it's a lie. So the speed of light in a vacuum is 300,000 km/s. This is the fastest speed any object in the universe can travel at. So what happens if you try to accelerate an object going the speed of light? Well picture this: a rocket accelerate to the speed of light, but the thrusters are still pushing on the rocket. You might be tempted to say that the frictional force balances with the thrust of the rocket, so there's no net force. But then how would the rocket have accelerated to the speed of light? There must be a net force. Given that there is a net force, work is being done on the rocket. Therefore, there is a change in kinetic energy, but velocity isn't increasing. That means the other component of kinetic energy must be increasing: mass. In most cases mass is a constant, but when energy cannot be transferred into speed any longer, it has to be transferred into mass instead.
  2. That looks super interesting!
  3. That's super cool man!
  4. That sure is neat!
  5. Black holes are often thought of as dark holes sucking matter in towards them by there massive amount of gravitational force. Interestingly enough, however, black holes are anything but black. Black holes might be dark, but they glow. It is well known that black holes decay until they don't have enough energy to sustain their mass, thereby not allowing them to exist any longer. But what does this loss of energy turn into? The slight glow in black holes. This slight glow is due to "Hawking Radiation". It is the slight decay of energy into radiation from black holes over the time of their existence. It is intriguing all the unknown facts about the universe and how much more is left to be discovered!
  6. Yeah yo-yos are the coolest.
  7. That sounds super interesting.
  8. That's so interesting and remarkable that a magnetic field could trap particles emitting light.
  9. The speed of light is known as 300,000 km/s and we leave it at that. But this speed is only the speed of light through a vacuum and light doesn't always travel in a vacuum. The slowest recorded speed of light is actually 17 m/s, a speed easily attainable by a car. So what happens then if particles can travel faster than light? Well in many nuclear reactors, this is what happens. Particles travel at a speed greater than the speed of light in that specific atmosphere. When this happens an emission of blue light emerges. This is called Cherenkov Radiation and it can be compared to a sonic boom, which happens when an object is travelling faster than the speed of sound, but with light. It is interesting the concrete ideas we have about physics and specifically light, but all of these concrete "facts" can be manipulated and produce unforeseen outcomes.
  10. Recently in our physics class we were discussing the theory of relativity and how it works in nature. Without learning the math behind the theory yet, the theory is incredibly confusing, but it reminded me of a video we watched last year in my physics class that discussed how observers can change the way particles act. In a certain experiment, physicists shot electrons through a small slit to see the nature of an electron, whether it would act as a wave or as a particle. Incredibly, even though an electron is a particle, when the experiment was first run, it acted as a wave and diffraction occured from its passing through the small slit. The physicists desired to know more about this remarkable discovery so they ran the experiment again, except this time with an extremely accurate slow motion camera recording the electrons movement. In this trial the electrons acted as particles. The physicists were astounded, but checked again and again and realized it was the camera that changed the electrons behavior. A particle, which has no ability to think, changes its behavior based on whether or not it is being observed. I believe this is one of the most fascinating things about physics, how particles, and our planet, changes its actions based on whether or not its certain actions are being observed. Here's a short video explaining the experiment.
  11. That's crazy!
  12. Good job Jeremy.
  13. I was recently driving on a day when it was raining fairly aggressively. I was driving fine when all of a sudden a car headed the opposite direction from me slid right in front of me almost hitting my car. After assessing the accident and making sure everyone was okay I began to think about what made the car slide all the way to the opposite side of the road. As the pavement was wet, the coefficient of friction between the car and the road was decreased. This made it so the traction in his tires didn't help him with turning. He was beginning to slide to his right side, and tried to compensate for the sliding by turning to the left. He turned to far to the left, however, and when the tires hit a dryer spot on the pavement the traction between the tires and the road suddenly increased. This pulled his car hard to the left and then allowed his car to slide all the way over to the other side of the road. It is intriguing how simple physics can become complex when situations, or in this case a changing coefficient of friction, change. So if you're driving in the rain or the snow and begin to slide, remember to keep your wheel straight, don't try to turn to far.
  14. Most people today have iPhone's that have an immensely complex system of wires in them to allow them to function properly. They are filled with wires, small batteries and capacitors to allow for the story of data and basic functions on your phone. But this complex system presents a problem when faced with a magnet. If a magnet is brought closer to a phone it will cause a changing magnetic field around the phone's wires. The change in the magnetic field will cause current to move in the direction opposing the change in the magnetic field. But doesn't the complexity of iPhone's help prevent this problem? Actually it makes it easier to destroy an iPhone with a magnet. Since magnetic fields can only affect current perpendicular to their direction, the complexity of an iPhone's circuits provide ample opportunity for the changing magnetic field to align properly with a coil of wire thereby inducing a current in your iPhone and destroying it. So next time you're near a magnet don't rub your phone up against it!
  15. Now I know the physics behind the best movie snack.