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  1. Feb 12, 2024 · First, let's assume that it is possible — though it is not — for a human to move at the speed of light, which is 299,792,458 meters per second (983,571,056 feet per second), or about 186,000...

  2. Feb 11, 2015 · Accelerating a purse to the speed of sound is going to be icky. The average purse weighs about 2kg. An acceleration of $30000 \text {m}/\text {s}^2$ on that is going to yield a force of 60kN on the poor pursestrap. For perspective, a climbing carbiner is rated to 20-30kN.

  3. Do you know how fast an object would need to move for the human eye to NOT register it? This blog will tell you how fast we can actually see.

    • Physics Undone
    • Special Relativity
    • Time Travel
    • Cause and Effect
    • E=Mc^2
    • The Standard Model
    • String Theory
    • Neutrinos
    • Tachyons
    • Supernova 1987A

    Scientists officially announced Friday (Sept. 23) that subatomic particles called neutrinos may be passing the ultimate speed limit, zooming at a velocity faster than light. But according to Einstein's special theory of relativity, nothing can cross this barrier. So either the measurements are incorrect, or physicists must revise many trusted theor...

    The speed-of-light rule represents the backbone of Einstein's 1905 special theory of relativity. This law does away with the concept of absolute velocity, and instead says that motion is relative. Except for light, that is. All observers, no matter what their own speed, will measure the speed of light at a constant 299,792,458 meters per second (ab...

    Special relativity states that nothing can go faster than the speed of light. If something were to exceed this limit, it would move backward in time, according to the theory. The new finding raises all sorts of thorny questions. If the neutrinos really are traveling faster than light, then they should be time travelers. The particles could theoreti...

    A fundamental law of physics, indeed of all science, is causality: that cause always precedes effect. This was accepted in classical physics, and the special theory of relativity took pains to preserve the rule, despite the relativity of an object's motion. But if something can travel faster than light, it can travel backward in time, according to ...

    Einstein's famous equation E=mc^2states that energy (E) and mass (m) are equivalent, and can be converted from one to the other by the ratio "c-squared," where c represents the constant speed of light. The status of the speed of light as the ultimate cosmic speed limit is the reason for its presence in the seminal formula. But if c is not in fact t...

    The Standard Model is the name of the reigning theory of particle physics, which describes all the known subatomic particles that make up our universe. [Countdown: The Coolest Little Particles in Nature] But if the speed of light rule, and the theory of relativity are rewritten, this model too may need adjusting. "One of the foundations of the Stan...

    String theory is the cutting-edge idea that all fundamental particles are actually tiny vibrating loops of string. This assumption turns out to have broad-ranging implications, including the possibility that our universe has more dimensions than the known three dimensions of space and one of time. String theoryis incredibly difficult to test, and t...

    Perhaps the new discovery doesn't mean that just anything can travel faster than light, but merely neutrinos. If that's the case, then there's definitely something special that scientists didn't know about these particles. Neutrinos are already understood to be oddballs. They are neutral, nearly massless particles that hardly ever interact with ord...

    In the 1960s physicists suggested that particles may exist that can travel faster than light. These particles, dubbed tachyons, have only been theorized, never detected. Because of tachyons' troubling properties, including the possibility that they would violate the rule of causality, many physicists have considered them a fringe notion. Yet if the...

    One of the most contradictory pieces of evidence to the new findings comes from observations of the supernova SN1987A, which lies about 168,000 light years from Earth in the Large Magellanic Cloud. Observations of this dead star from the Kamiokande II experiment in Japan found that light and neutrinos that departed the supernova arrived at Earth wi...

  4. Mar 19, 2018 · So, in theory, if something travels faster than the speed of light, it should produce something like a "luminal boom". In fact, this light boom happens on a daily basis in facilities around the world - you can see it with your own eyes.

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  6. Oct 1, 2014 · While the human body can withstand any constant speed—be it 20 miles per hour or 20 billion miles per hour—we can only change that rate of travel relatively slowly. Speed up or slow down too...

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