Speed Light
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Speed Light
Emergency lighting is essential in many areas of life, none more so than for emergency situations
You will see Emergency lighting without even being aware of it. The illuminated exit signs in your work building, and the flashing red light on your electronic gadgets. The benefits of having emergency lights don't need to be spelled out as they are there for one reason and that is to warn us. The same is true of emergency response vehicles such as police, fire service and medical teams. They all need some form of Emergency lighting. With emergency vehicles the lighting could be a lightbar, flashing beacons, strobe lights or a combination of all of them. The purpose of emergency light in any situation is to warn us of either impending doom (a dying gadget) or of a situation we should be diverted from.
It's fair to say we probably pay more attention to Emergency lighting in our places or work. After all we need to know the quickest route out of the building. We also pay a great deal of attention to lights that flash on our electronic equipment or games consoles which is probably the last thing we need to pay attention to! We pay less attention to the warning signs and Emergency lighting we see on our roads and streets and those are the ones we really shouldn't ignore. We can ignore the flashing lights at the roadside but that is extremely dangerous and foolish.
The Emergency lighting that should be taken seriously is that on our emergency or first response vehicles. All of the lighting on emergency vehicles has a purpose and that is to warn and inform us of what we are approaching or that the vehicle is approaching us. Emergencies happen at all times and we can't avoid them but we can be safe when passing them by paying heed to the lights and what they are telling us. It may seem strange saying that lights tell us something but they do. You have traffic advisor lights on vehicles that will advise you to move to an adjacent lane, and light boards at roadside that will tell us the appropriate speed.
Light is important to us today as it has always been important to us in the past. Light used to protect us from the unknown and potential harm by predators. The light of a fire in a camp can keep unwanted visitors away keeping us safe. As soon as man discovered fire he discovered the power of it and the light it produced. We are little different today in that we still have lights that protect us and keep unwanted things at bay. Emergency lighting is today's equivalent of the blazing fire in camp and it can keep us safe.
In any emergency you will find light, it illuminates areas and people and it can advise us of hazard and danger. Flashing lights or strobe lights will always be recognized by us as warning lights and Emergency lighting is just that, warning. We probably don't ever go through a day without encountering some form of Emergency lighting, but the urgent flashing circle on a games console is certainly not as important as a flashing beacon light on an emergency vehicle. We must act accordingly and appropriately whenever we see a flashing light, but do get your priorities right and respond to the important ones!
Extreme Tactical Dynamics is a one-stop shop for emergency lighting units and other items like Flashlights, Dash Lights, Deck Lights, police lights, etc. Please visit the site for more details of various items available - http://www.extremetacticaldynamics.com/
About the Author
I am a Microsoft Certified Professional. I conduct Training and Certification Guidance for Microsoft .Net Certification Courses through my training institute-Sierra Infotech. I also own and manage a SEO Company and article Directory.
What happens when you fire a projectile at 99% of light speed?
So what I'm asking is if a vessel is traveling at 99% light speed and fires a rocket or cannon. (any projectile) What is that projectiles speed? Since nothing can travel faster than light speed how will this projectile accelerate out of the vessel?
If you were in a train travelling at 100m/h and there was a bystander watching, relative to the bystander you would be moving at 100m/h. However relative to the train you wouldn't be moving. This is why we say motion MUST be described relative to something.
If you threw a ball while on the train at 5m/h, to the bystander the ball would be measured at 105m/h. i.e the speed of the train + the speed of the ball, However relative to you, the ball would be moving at 5m/h.
If you were on this train moving at 100m/h, and the headlights were turned on, what speed do you think the bystander would measure the photons at? if you are using the velocity adding technique this would be wrong, it was demonstrated clearly that when dealing with things to do with light speed, the velocity of light is ALWAYS the same. So you in the train would measure the same speed of light as the bystander on the train tracks...surely this doesn't make sense. But it does.
Likewise if a vessel was moving at 99% the speed of light, and it shot a projectile, you would think due to the velocity adding technique that as the projectile was already travelling at 99% the speed of light, then when you add the velocity of the projectile itself it would be moving faster than light. Except this doesn't happen, the projectile would not move faster than the speed of light, the velocity adding method doesn't apply when dealing with things near light speed.
Light will always be faster than the projectile, and the reason this would be achieved is through time dilation and length contraction. The projectile and the vessel would be shortened in the direction of movement. And relative to a stationary observer time on the vessel would have slowed down tremendously. As we all know speed = Distance/Time. With length contraction + the effects of time dilation, no matter how fast the vessel or the projectile is travelling the speed would always be worked out to be smaller than the speed of light. Why? because like I explained, time dilation makes it so that a body moving at or close to the speed of light time will slow down, for the inhabitants of the vessel it would seem that NOTHING has changed and that time was progressing as normal, but to an observer it would be clear that the time on the vessel would be moving much slower relative to a stationary clock. The length contraction of the vessel and the projectile would mean they would cover a smaller distance in length than they would normally, combined with time running slower, Speed=Dist/Time would work out to be smaller than the speed of light.
NASA | Einstein's Cosmic Speed Limit