Traffic barriers (sometimes called Armco barriers, also known in North America as guardrails or guard rails and in Britain as crash barriers) keep vehicles within their roadway and prevent them from colliding with dangerous obstacles such as boulders, sign supports, trees, bridge abutments, buildings, walls, and large storm drains, or from traversing steep (non-recoverable) slopes or entering deep water. They are also installed within medians of divided highways to prevent errant vehicles from entering the opposing carriageway of traffic and help to reduce head-on collisions. Some of these barriers, designed to be struck from either side, are called median barriers. Traffic barriers can also be used to protect vulnerable areas like school yards, pedestrian zones, and fuel tanks from errant vehicles.
While barriers are normally designed to minimize injury to vehicle occupants, injuries do occur in collisions with traffic barriers. They should only be installed where a collision with the barrier is likely to be less severe than a collision with the hazard behind it. Where possible, it is preferable to remove, relocate or modify a hazard, rather than shield it with a barrier.To make sure they are safe and effective, traffic barriers undergo extensive simulated and full scale crash testing before they are approved for general use. While crash testing cannot replicate every potential manner of impact, testing programs are designed to determine the performance limits of traffic barriers and provide an adequate level of protection to road users.
I have some questions about barrier tunneling in a scanning tunneling microscope.
From what I know, the microscope consists of a one atom tip very close to the surface of the metal being examined. A potential difference is applied between the tip and the metal and some of the electrons manage...
This is my second post after that of "Shuttle Main Engines" in which I use again the question: what is happening here?
First of all, open the .jpg file below.
It shows a F-4 Phantom breaking the sound of barrier. I'm interested on what happens in the condensated flow. First of all, why is...
In quantum mechanics particles which do not classically have
enough energy to pass through a barrier do so.
But surely there is no mystery here if the energy of the
barrier is not as great as it is thought to be.
Charged particles from space could be penetrating
the barrier and cancelling...
I have a question to do but I am a bit confused about one thing. It invloves protons penetrating a barrier. The protons ae quoted to have a KE in the units of eV (which i will have to convert to joules in order to work in SI units). However the barriers height is given in volts. I assumed...
Friend asked me this question ,and I wasn't about answer.
Not my area of expertise).
I guess rocket gets easier trough the sound barrier than millitary jet aircraft due to somewhat "less" problematic geometric shape.
I mean there is no such problems with wings and drag like in aircrafts?
(modified this to reflect a better understanding)
Stationary solutions to the wave equation mean that if I calculate <x> I will get a value independent of time. For a potential defined as V(x) =0 from x = 0 to a and infinite outside that range of x, the lowest energy solution is Psi(x,0) = A...
Its something that I should be able to figure out easily but my brain is refusing to work this term. So any help will be appreciated.
In a scattering experiment, gold nuclei (Au Z=79 A=197) are bombarded by alpha particles (He Z=2 A=4)
If the Kinetic Energy of the apha particles is...
A new claim has appeared in physics. It is claimed that there is a largest
possible force, namely c^4/4G or 3 x 10^43 Newton.
(The claim is made in the paper http://xxx.lanl.gov/abs/physics/0309118 )
All my friends and acquantances have first said "wrong!"
but then failed to produce a...
[SOLVED] Underwater barrier
[?] Since I've been lookin a the concept and knowledge to what happens when the sound barrier gets broken and how it happens, it got me thinking about if the same thing can happen in water.
i.e. If an object was to move faster than the water molecues could move what...