If you turn on a light at some point in space, a person that's far away wouldn't know the light was turned on right away since light travels at a finite speed. But it's not just light that has a constant speed, change has a constant speed.
It's how fast you can ever know that something actually happened. The same thing happens with gravitational fields. When two black holes collide, they create gravitational waves that also travel at this speed of causality. When LIGO the gravitational wave detector first observed an event like this, it actually happened 1. In fact, if you have any event that causes a change somewhere else the cause and effect are delayed by a time because of the speed of causality.
It just so happens that light also travels at the speed of causality c. OK, so Flash just needs to go faster than the speed of light to go back in time. Well, yeah We often talk about the energy associated with a moving object. The faster it moves, the greater its kinetic energy. This model works fine for normal-speed objects—but when things go really fast we need a better energy model. This is the expression for the energy of a moving particle.
In this equation, v is the velocity of an object, c is the speed of causality see, I already changed it and m is the mass of the object as measured in a stationary frame. First, notice that if the velocity of the moving thing is zero then the energy is just mc 2 which you've probably seen before.
Next, let's consider what happens when the value of v increases. That means that the denominator of that fraction gets smaller and makes the energy very large. What would happen if the velocity was exactly equal to c?
You can't do that, so you can't go at the speed of light—at least not if you have mass. Light and gravitational waves can travel at the speed of light because they aren't "things". Let's use the energy equation above for an object velocity of 1.
Here's what you get. Yes, you end up with the square root of a negative number. That means we end up with an imaginary energy—remember that we represent the square root of negative 1 as the imaginary number i. So, that's it right? You can't do it. How about this? What if there is a particle with an imaginary mass? In that case, you get an i 2 term such that you are right back to a real energy.
Despite some inconsistencies from episode to episode, Barry Allen has generally been shown to be boosting his top speed, slowly but surely. One important factor to keep in mind when considering Barry Allen's powers is the Speed Force; a semi-mystic dimension of pure velocity, which empowers every organically created speedster. The Speed Force basically acts like the nitro booster on a muscle car's engine, pushing a speedster beyond their natural abilities in short bursts.
The Speed Force also acts as a protective influence, negating the effects of friction and impact upon a speedster and anyone they are touching when they use their powers. This distinction is important, as the idea that Barry has a superhuman top speed when he isn't tapping the Speed Force explains some of the seemingly random elements in Barry's performance over the years.
For instance, it was a running gag early in Barry's career that he kept setting his street clothes on fire whenever he ran at his top speed without changing into his costume first. Later, after Barry learned about the Speed Force and how to use it to protect himself and others, he stopped having this problem.
This idea was also confirmed in the second half of The Flash season 6, when it was revealed that the Speed Force was dying and there was a limited amount of Speed Force energy in Barry's system, limiting his ability to utilize it as time went by. Barry managed an impressive feat during his first outing as The Flash, offering a quantifiable baseline for his starting speed.
The pilot episode of The Flash pitted Barry against Clyde Mardon; one of a pair of bank-robbing brothers, who gained the power to control the weather after getting caught in a thunderstorm when STAR Labs' particle accelerator exploded.
In order to stop the tornado, Barry had to run around it in the opposite direction at over twice its speed, clocking in at mph or To put Girder down for the count, Barry developed a supersonic punch that multiplied his mass by his velocity, giving him the power needed to hurt a man of living metal. This required that Barry run in a straight line for 5. By the end of The Flash season 1, Barry had learned how to tap into the Speed Force and how to accomplish feats like phasing his molecules through solid matter.
His most impressive deed came during the season 1 finale when Barry traveled back in time for the first time in a bid to prevent his mother's murder at the hands of Eobard Thawne. Cisco said 'wow Before Barry became The Flash he was not known for being an avid runner, so there is no reason why he would be able to run faster than anyone else.
Another viewer added: "He wasn't a track runner so without the Speed Force he's got the speed for someone his build who lacks proper form. The Speed Force is an energy field that pushes space and time forward, allowing The Flash to travel at superfast speed. With Speed Force, he is able to run at 2, miles per hour - compared to the average speed of 28 miles per hour. The Flash's speed is not quite the speed of light, which is approximately ,, miles per hour.
In the current season, The Flash saw himself diminishing back into the old Barry as he only had one percent of his Speed Force energy remaining. This could not have come at a worse time as he woke from his frozen state to find villain Eva McCulloch Efrat Dor causing havoc.
Eventually, Eva saw the error of her ways and she attempted to join Barry in destroying her duplicate fighters. The catch? Only those who can run the treadmill up to super-speed can use it. The Cosmic Treadmill requires an immense amount of power and the process is often damaging to its user. The Flash , the long-running television series on the CW, also includes the Cosmic Treadmill, but only the most recent seventh season. Before that, Barry Allen played by Grant Gustin in the series was exposed to time travel through the use of time vehicles like the Time-Sphere or Time-Ship.
But the DCEU is where time-travel devices become more difficult to pin down.
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