Unexplained bright flash of light inside house - Physics Forums
Dec 31, 2022 · Is a bright flash of light inside a house a sign of a paranormal activity? While some people may attribute a bright flash of light to paranormal activity, there is no scientific evidence to support this claim. It is more likely that the flash is caused by a natural or man-made occurrence, such as those mentioned in the previous answer.
Camera Flash Circuit Explanation - Physics Forums
Jul 22, 2012 · What is the purpose of a pre-flash in a camera flash circuit? A pre-flash in a camera flash circuit serves two main purposes. First, it allows the camera to meter the amount of light needed for the photo before the actual flash occurs. Second, it helps reduce the red-eye effect by causing the subject's pupils to constrict before the main flash.
How to calculate flash point of mixture? - Physics Forums
Jun 7, 2012 · Hey guys, I would like to create a mixture out of two liquids with an ideal flash point of around 70ºF. The liquids I have to work with are 200 proof (100%) isopropyl alcohol (2-propanol) and aliphatic hydrocarbon mixture (aka hydrotreated petroleum distillates). What I'm looking for is the...
What Caused the Strange Flash of Light in My Bedroom at 3:57am?
Apr 15, 2022 · FAQ: What Caused the Strange Flash of Light in My Bedroom at 3:57am? What is the strange light of alien origin? The strange light of alien origin refers to any type of light or illumination that is believed to come from extraterrestrial sources. This could include sightings of unidentified flying objects (UFOs) or other unexplained phenomena.
Jet Fuel, JP-5, JP-8 & DFM: Properties, Chemical Composition ...
Aug 12, 2006 · JP-5, JP-8, and DFM are all different types of jet fuel used by different branches of the military. JP-5 is a high flash point kerosene-based fuel used by the Navy and Coast Guard, while JP-8 is a lower flash point kerosene-based fuel used by the Air Force and Army. DFM, or Diesel Fuel Marine, is a variant of JP-8 used by the Marine Corps.
Relativity of Simultaneity and lightening - Physics Forums
Jan 19, 2017 · 1. In the case of the assistant does seeing the flashes =/= measuring the strike? How would one be able to see a simultaneous flash but measure a non-simultaneous strike? 2. Why does the assistant share the same frame of reference with 'me'? Is it because of the equation x = x' +vt where v (assistant w.r.t 'me') = 0 and therefore x = x'?
How Does a Grenade's Shockwave Cause Fatal Injuries? - Physics …
Oct 6, 2008 · Stun grenades, or "flash bang" grenades, operate on this principle. They produce a large blast but almost no shrapnel. The noise and brightness of the flash are very disorienting, and the shock wave can actually knock a person down, but the chances of being killed by one, even at close proximity, are very slim.
Why doesn't infrared radiation travel through glass - Physics Forums
Jun 7, 2010 · The only one you will not see is the flash light, and the cell phone has far less wattage than a flashlight. That assumes that the effective conductivity of the substance is frequency independent. However, by Kramers-Kronig we know that any lossy medium must be dispersive (and vice-versa, stupid causality).
Magpul PRS Lite/ DD CH/ LH holsters/dummy rounds/Sights
Dec 25, 2024 · Daniel Defense AR-15 Grip-N-Rip Ambi charging Handel -$60 Daniel Defense Flash Suppressor (for DDM4v7) -$35 BCM A2X Flash hider -$20 Magpul PRS Lite - $60 Magpul enhanced rubber butt pad -$10 FoxX IWB P30SK left handed leather/Kydex holster -$40 Alien Gear left handed OWB holster P30 -$20 We the people holster OWB left
Events vs Effect of Events in Relativity of Simultaneity - Physics …
Dec 10, 2024 · Take the carriage away and make the event an instantaneous flash, and then he cannot say that he is nearer or further away from the event between the event occurring and him seeing it - events have no frame of reference. Einstein's thought experiment depends on the flash hitting the end of the carriage to give it a frame of reference.
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