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jwdiehl88

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  1. jwdiehl88

    Metamaterials

    By jwdiehl88,

    Could you create an invisibility cloak?  I mean if it was possible it would be insane.  But what if there exists a material that scientist created that allows it to bend light or an electromagnetic radiation of an object, giving the appearance that it isn’t there at all.  Light is electromagnetic radiation, made up of vibrations of electric and magnetic fields. Natural materials usually only affect the electric component.  However metamaterials can affect both the electric and magnetic field.   Metamaterial is a material engineered to have a property that is not found in nature. They are made from multiple elements composite from materials such as metals or plastics.  Physicists from the UK and Germany made one small device that made small objects invisible to near-infrared radiation and worked in three dimensions.  
  2. jwdiehl88

    Explosions

    By jwdiehl88,

    It's hard to think about a how an explosion has momentum conserved because an explosions blows up everything in little pieces.  However, those infinite amount of pieces all contribute to conserve the momentum of the explosion before it exploded.  The law of conservation has a simple equation of mass times velocity initially equals the mass times velocity final.  An explosion before it happens is equal to zero because it has no velocity at all.  After the explosions, the pieces broken off in the explosion will go everywhere.  The direction of the pieces matter because after the explosions, the direction of the pieces will have equal magnitude but just in the opposite direction.  So when you had up all of the individual pieces of its direction, mass and velocity, the pieces will even each other out.  Therefore the sum of all of the infinite pieces after the explosion will have a momentum equaling zero.  Therefore the momentum of the explosions is conserved.  It's crazy to think that the aftermath of an explosion has zero momentum.
  3. jwdiehl88

    Time Travel

    By jwdiehl88,

    Is time travelling even possible? Maybe, but to time travel a person has to be faster then light which is impossible because no one has enough energy to move faster than that speed.  However, Einstein’s special theory of relativity, developed in 1905, shows that time passes at different rates for people who are moving relative to one another - although the effect only becomes large when you get close to the speed of light.  If anyone has seen the TV show, the "Flash," the Flash is able to run at incredible speed.  He is relatively faster when a person watches him.  But in his own body he is running normally while everything else in the background is a blur.  Relative to him running at a speed close to light, his perception of fast is different to a person that is much slower than the speed of light.  But there may be an out to be found in general relativity, there are a possibility of wormholes – a kind of tunnel through space-time connecting otherwise very distant parts of the universe.f the “mouths” of the wormhole are moving relative to one another, then traversing the bridge between different points in space would also take a traveler to a different point in time to that in which she started.  The Flash is fast enough that he creates his own wormhole where he is able to travel between worlds and time itself.  
  4. jwdiehl88

    Shooting Your Grade Lab

    By jwdiehl88,

    On Friday, September 16, 2016, at 10:25 to 11:07,  Dan Fullerton presented a lab.  Unfortunately,the best 22 students of the high school, failed!  Thankfully, Mr, Fullerton allowed us to redeem ourselves by writing what the right answer was and why we failed.  This lab, Mr. Fullerton assigned to us was to shoot a projectile and predict where it would land.  By doing this we had to use kinematics.  We failed this lab for many reason. One main one was our lack of communication among our class. We didn't agree on measurements and we didn't communicate on answers. What we should of done was made four or five groups to figure out the answer and then at the end compare results.  Another reasons we failed was that we forgot to set our direction.  We didn't dictate what was positive or negative.  In our Y-component,  we assumed that everything was positive, but this was untrue.  If we made the down direction positive, then the height and acceleration is positive, however the initial velocity is negative.  Another reason why we failed, was that we had a variety of time of when the projectile was shot.
    When I redid this lab, the distance I found was 199.7 cm.  I found this by calculating the initial velocity of the X component and Y-component.  I made sure that I dictated the direction.  Then I used Pythagorean Theorem to find the initial velocity of the projectile.  Then, when Mr. Fullerton changed the angle and height of the projectile, I had to find the the X and Y velocity components.  I used the initial velocity, multiplied it by  cos (the degree) and sin (the degree).  Then I found the time in the Y-component, which is the same for the X-component.  Then I multiplied it by the new X velocity component to find my distance. 
     

     
  5. jwdiehl88

    Swimming

    By jwdiehl88,

    Swimming is a popular sport that involves a ton of physics. The physics of swimming involves an many forces between the water and the swimmer. It is these forces which propel a swimmer through the water. In order to swim, a swimmer must "push" against the water using a variety of techniques. There are four major techniques used for swimming. They are, Front Crawl (freestyle), Breaststroke, Backstroke, and Butterfly stroke.  There are others, but ate used for recreational uses.  By moving his or her arms through the water the swimmer creates a thrust force that propels the swimmer forward.  This can relate to Newton's third law: every action as a reaction.  The swimmer creates a force in the water and the water creates a equal opposite to propel the swimmer.  However, there is a drag force created by the motion of the swimmer through the water. This force resists the motion of the swimmer through the water.  This is why, it is very hard to swim long distances because there is a friction force resisting you from swimming.  

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