Speed of Light

I just had this on my 98 Sentra last week. I checked all grounds and found no notable problems. I did notice that the lights would also go dim along with air bag light and speedometer during this problem, Had parts store check alternator which came out good at normal 2K RPM. Ran 2nd test at 2.9K to 3K RPM (raised RPM until dome light dimmed) which showed current dropped to almost zero. Changed alternator with new one and is now working great.

I believe it might be because the light has nothing to reflect off of so it would travel in a straight line

Depth perception, perspective, and color are all phenomena of vision used in cinematography to create visually appealing and engaging scenes. By manipulating these aspects, filmmakers can control how the audience perceives the visual information presented on screen.

According to Einstein's theory of relativity, an object cannot travel at the speed of light due to infinite energy required. Therefore, the length of a train moving at the speed of light is an undefined concept.

it is 186,282 per second that is 299,792 kilometers and that is about 670,616,629 mph

Because sound waves are mechanical vibrations of material matter. You can't

have sound waves in a space where there's no material to vibrate.

Excellent question !

The answer is: Because, even though it's called a "force", it's not really a force, in
the proper sense of that word.

Since the early experimenters in electricity who made up the label, the concept of
'force' has been pretty well taken over by Physics, to mean actual physical force,
measured in Newtons, capable of accelerating masses, maintaining orbits, etc.
But we still humor the electrical guys, by keeping their old, quaint, comfortable
label for the magnitude of the fields that make electrons move.

There's still room for tradition in language, even where a computer might protest
its misuse. So we still have "electromotive force", "forceful personality", "a force
for law and order", and "La Forza del Destino".

It displaces oxygen/air in your lungs because H is heavier then oxygen/air. Therefore changing the characteristics in how you sound.

because laser is highly coherence and its angur spread is very small!

piece of metal because most pieces have smooth surfaces so the light bounces off perfectly. but wood has a rough surface and wood also absorbs most of the light so it wouldn't reflect off.

No - you would be stopped BEFORE you reach the speed of light, by your increasing mass (among other things). As your speed approaches the speed of light, your mass would approach infinity, and it would require an infinite energy to actually achieve the speed of light.Note that the "speed of light" is not really about light. It is a speed limit of our Universe; some have described it as the "speed of causality".

When scientists refer to the speed of light, they're talking about the photons which make up light. Darkness is the absence of light; hence, there are no photons. There is nothing to measure. The speed of darkness is undefined as there is no quanta making up darkness. Put simply: There is no speed of darkness!

1mile = 1.609 km

Speed of light in kms-1 = 300000 kms-1

Speed of light in miles per sec = 300000/1.609 ms-1

= 186451.21 ms-1

In mph, speed of light = 671224362.958 mph

but it does as earth's axis tilts.

In order to measure volume, one normally sees how much water it displaces.

If the body floats, the water displaced will be equal to the weight of the body, not the volume. It will be necessary to force the body down so that it is totally submerged. If there is an anchor and chain below the surface, the water displaced when the body is attached and submerged will have the same volume as the body.

Most likely because the paint on it absorbs all visible wavelengths

in sunlight EXCEPT the yellow ones.

Note: The same principle applies if the yellow car is in a showroom,

on a highway, or in a junkyard, as well as in a parking lot.

None. The speed of light is usually assumed to be constant. The symbol used to represent the speed of light is "C", as in E=MC2. Then why is it called a variable speed?

The Radius of the Star is 10 KM. Now we need to find the diameter. Circumference equals pi times the Diameter. That is twice the Radius, which is 20. Now we need to get the Diameter. We multiply the diameter by pi. 20 times 3.1416. 20 * 3.1416 = 62.838. Now we multiply the circumference in kilometers by the speed. 62.832 * 642 = 40,338. Now we take the speed of light, 299,997 per second and divide it into the speed of a point on the equator of our star going 40,338 kilometers per second. 40338 / 299997 = 0.1345

Also 1.5. That's how the index of refraction is defined.

A great question. First--It isn't always constant. Light can travel slower than "c" ("the speed of light"). In a perfect vacuum light travels at "c". It's slower in glass, air, water, etc., light can even stop! But "c" is the upper speed limit. Second--Not only light but ANY disturbance in the universe has a speed limit of "c". Even the influence of gravity travels at the speed of light. Third--Einstein didn't just wake up one day with a good idea. The constancy of the speed of light (and relativity in general) explained many curious observations that had been made, and solved many physics problems. Fourth--There have been competing theories that allow a variable "c" but all the experiments indicate that it is indeed a constant value.

An auto-darkening helmet contains an electronic shutter module. This module contains fixed/static IR (Infra-Red) and UV (Ultraviolet) filters that require no electricity to operate along with an electrically operated LC (Liquid Crystal) light valve or shutter. The LC valve/shutter darkens/lightens when a voltage is applied that re-orients the crystals that are floating in a liquid which is separated by two sheets of glass. The shutter module also contains photocells (light-dependent resistors) or other photosensor that is wired into an electronic control module. The control module detects the bright light emitted by the welding arc and closes (darkens) the LC valve/shutter. A timer circuit lightens the screen again some time (perhaps 100 milliseconds) after the arc goes out and ambient light levels return to normal.

The Liquid crystal itself is not sensitive to light and does not change tint independent of the control circuit.

Modern auto-darkening welding helmets have adjustments for sensitivity, shade (darkness achieved when arc triggers helmet), and time delay after arc removal before helmet returns to the normal, non-darkened state.

The sensitivity adjustment controls how readily the helmet darkens when exposed to a bright light source. If the sensitivity adjustment is set too low, the helmet may not darken when exposed to the arc, especially if the arc is small. On the other hand, if the sensitivity is set too high, the helmet may stay darkened when exposed to sunlight, bright room lights, arc flashes from other welders some distance away, etc.

Some auto-darkening welding helmets, especially higher priced ones, allow the user to adjust the "shade" value. One popular helmet allows adjustment between shade 9 and 13. Shade 9 is adequate for small, low intensity arcs, while 13 is used for bright, high energy arcs in dark spaces. The helmet user should initially set the helmet for an intermediate value and adjust the shade value up or down as required to get the best view of the work while welding and above-all to avoid excessive brightness that dazzles or irritates the eyes.

The index of refraction of a substance is

(The speed of light in vacuum) divided by (the speed of light in the substance) .

The speed of light ! Nothing travels faster !