He was trapped on the road when he heard the sound of an approaching car.

An animation illustrating how the Doppler effect causes a car engine or siren to sound higher in pitch when it is approaching than when it is receding.

Nevertheless, these fighters could only achieve modest increases in top speed due to problems of compressibility created as aircraft and their propellers approached the sound barrier, and it was apparent that propeller-driven aircraft were approaching the limits of their performance.

In the world of the audiophile, however, high fidelity continued and continues to refer to the goal of highly accurate sound reproduction and to the technological resources available for approaching that goal.

Tornadoes occurring in these conditions are especially dangerous, since only weather radar observations, or possibly the sound of an approaching tornado, serve as any warning to those in the storm's path.

A civil defense siren ( also referred to as an air raid, civil defence, tornado, tsunami, fire, flood, weather, time, curfew, earthquake, storm, police, emergency, hurricane, or other outdoor warning siren / whistle / horn / alarm ) is a mechanical or electronic device ( modern-day sirens are electrically powered whether they are electronic or electro-mechanical ) for generating sound to provide warning of approaching danger and sometimes to indicate when the danger has passed.

Additionally, dingoes emit a sort of " wailing " sound, which they mostly use when approaching a water hole, probably to warn already present dingoes.

The charango's ten strings require quite a large headstock, often approaching or even exceeding the size of its diminutive sound box.

Sergeant Joseph Paradine hears the army approaching, but suddenly the sound stops.

When either of them spots a threat, they give a warning sound to let their partner know that danger is approaching.

The blast wind at sea level may exceed one thousand km / h, or ~ 300 m / s, approaching the speed of sound in air.

And the patent was very broad, introducing " a new and useful method of imitating the sound of a horse or horses approaching, departing, or passing at a gallop, trot, or any other desired gait, the same to be used in producing stage effects in theatrical or other performances or entertainments, exhibitions, & c ."

The latter can have a large feature set — approaching that of Basic as found in computers — including character and string manipulation, advanced conditional and branching statements, sound, graphics, and more including, of course, the huge spectrum of mathematical, string, bit-manipulation, number base, I / O, and graphics functions built into the machine.

Its 21 bells would sound the alarm if any enemy was approaching.

At the sound of someone approaching he escapes into the library.

An example: Because ( 1 ) the compressibility of air changes considerably approaching the speed of sound, and ( 2 ) the speed of sound varies considerably with density and therefore altitude ; the maximum speed at which an aircraft structure is safe, the never exceed speed ( abbreviated V < sub > NE </ sub >), is specified at several differing altitudes in faster aircraft's operating manuals, as shown in the sample table below.

After killing Martin and Jenny, Burrell searches the house, fails to find Simon, and leaves at the sound of approaching sirens ( Martin was able to call 911 before dying ).

The practitioner initially perceives ordinary symptoms as the hoofbeats of an approaching common horse ; as the equine diagnostic entity comes closer it becomes clearer that the " sound of a horse can sometimes be a zebra ".

Months before the Japanese attack on Pearl Harbor, Japan's naval ministry registered a fallacious protest with Ambassador Grew in Tokyo: " On the night of July 31, 1941, Japanese fleet units at anchor in Sukumo Bay picked up the sound of propellers approaching Bungo Channel from the eastward.

" Some of his fellow officers believed that he lost his nerve, concerned about the presence of Jeb Stuart on the battlefield and, hearing the sound of railroad cars approaching, imagining the possibility of a Confederate infantry force pinning him against the river.

However, when the girl heard sound of foot steps approaching towards the tower, she thought that it was the king coming to see her and she immediately committed suicide by jumping down from the tower.

* the s sound can be overstressed, almost approaching a soft th sound.

Redshifts are attributable to the Doppler effect, familiar in the changes in the apparent pitches of sirens and frequency of the sound waves emitted by speeding vehicles ; an observed redshift due to the Doppler effect occurs whenever a light source moves away from an observer.

The city's air raid sirens sound, and Sheffield erupts into panic, prompting Jimmy and his workmate Bob to take cover under their van.

In some areas in the United States, civil defense sirens may sound in the late morning and early afternoon on a regular basis.

Some mechanical sirens, such as the Federal Signal Thunderbolt series, also employ compressed air that is blown at the rotor to supercharge the sound from the siren, which causes the sound to be sharper and much louder than it would be with the chopper and stator alone.

Many warning sirens have a sound that is distinct from that used by emergency vehicles due to use of two simultaneous tones, with pitches usually in a 5: 6 frequency ratio ( an untempered minor third ).

These electronic sirens differ from electromechanical sirens in that they rely on a series of large loudspeakers to produce sound.

There is some question about the ability of a system of electronic sirens to broadcast a voice message with sufficient intelligibility over long distances – not only does the sound echo off some surfaces, the sound could have multiple arrival times from widely spaced siren sites.

One reason was because one of the police officers in the area had their car flipped over as it was on its way to sound the sirens to awaken the mostly asleep town.

It incorporates sound effects such as sirens, babies crying, crowd noise, etc.

The sirens make a variety of sounds, from the traditional wailing sound to a voice message.

Tornado alert sirens in the area failed to sound prior to the strike.

When this happens, the tornado sirens may sound in that area, letting people know that a tornado was seen or is forming nearby.

Allmusic's top-marks review states " The Chemical Brothers ' sound is big on bombast, replete with screeching guitar samples and lots of sirens and screaming divas.

As a local politician struggles with his microphone during the dedication speech, the " wacky, fun-loving " Monkees suddenly interrupt the ceremony by running through the assembled officials, to the sound of various horns and sirens.

Fire sirens can also be mounted near government buildings, on tall structures such as water towers, as well as in systems, where several sirens are distributed around a town for better sound coverage.

De la Tour's siren could produce sound under water, suggesting a link with the sirens of Greek mythology ; hence the name of the instrument.

" was a 1973 chart-topping song by British rock band Sweet, featuring the wailing sound of air raid sirens.

Sirens are not heard on the tape until more than two minutes after what is supposed to be the sound of the shooting ; however, McLain accompanied the motorcade to Parkland Hospital immediately after the shooting, with sirens blaring the entire time.

One of my virtues or vices is a sort of three-dimensional imagination complete with sound effects and glorious living color.

that theory was and is sound.

That such expansion can be obtained without a raise in taxes is due to growth of the tax digest and sound fiscal planning on the part of the board of commissioners, headed by Chairman Charles O. Emmerich who is demonstrating that the public trust he was given was well placed, and other county officials.

And then there is St. Louis county, where the Democratic leadership has shown little appreciation of the need for sound zoning, of the important relationship between proper land use and economic growth.

There's more reading and instruction to be heard on discs than ever before, although the spoken rather than the sung word is as old as Thomas Alva Edison's first experiment in recorded sound.

Your suggested solution, it seems to me, is grossly oversimplified and is inconsistent with your generally realistic attitude toward, and endorsement of, sound planning.

Where then is the sound planning and cooperation between agencies within the community that you have called for in other editorials??

He says that if he were to express to you, once again, his own profound determination to go to the Mainland, and his faith that that return is feasible, he would merely sound redundant.

Through the SBA's Management Counseling Program, practical, personalized advice on sound management principles is available upon request to both prospective and established businessmen in a community.

It is a sound investment.

Another example is the recent cancellation of the F-108, a long-range interceptor with a speed three times as great as the speed of sound, which was designed for use against manned bombers in the period of the mid-1960's.

Essentially, the question presented for decision in the present Daytime Skywave proceeding is whether our decision ( in 1938-1939 ) to assign stations on the basis of daytime conditions from sunrise to sunset, is sound as a basis for AM allocations, or whether, in the light of later developments and new understanding, skywave transmission is of such significance during the hours immediately before sunset and after sunrise that this condition should be taken into account, and some stations required to afford protection to other stations during these hours.

Aeschbacher's work is very much akin to Schnabel's, but the sound on his Decca disc is dated, and you will have a hard time locating a copy of it.

Telefunken has accorded him beautiful sound, and this bargain-priced disc ( it sells for $2.98 ) is worthy of consideration.

Yet it is the accumulation of distortion, the fitting together of fractional bits until the total reaches the threshold of our awareness, that makes records sound like records.

He is going sound again now, and looks good.

The travel time of sound in tissue is about 1500 meters per second ; ;

He believes that this is a sound approach to gas competition in builder developments where gas is available.

The sound mockery of sheep is like the salubrious horse laugh ''.