![]() I am not even sure how this sound would propagate down to the ground if you could even hear it at all. ![]() On top of that, he is in an area where the density of air is quite small. In fact, he is a small object high above the ground so it would be hard to hear. There should be one, but it wouldn't break any windows or anything. In dry, sea level air that is around 25 degrees. Honestly, I am not sure of the exact answer. The speed of sound, known as Mach 1, varies depending on the medium through which a sound wave propagates. Image: Wikipediaīut I still haven't said if there was a sonic boom for Felix as he fell. At the flick of a switch, they shoot off the sides, with the driver or an Xbox-loving patrol officer at home base controlling the mono-wheeled UAV as it slices through traffic in hot pursuit.Ī Flying Pursuit Unit (or FPU – let's just call it a drone), deploys from the nose of the E-Patrol, equipped with a pair of video cameras, a 3D terrain scanner and radar which autonomously flies over traffic to scout out what's causing yet another massive backup on the 405. It looks like the mashup of two Tron Lightcycles stitched together with an AMOLED/carbon fiber roof, but those two massive rear wheel arches are actually single-wheeled drones that are magnetically attached to the body. Dick to create the E-Patrol Human-Drone Pursuit Vehicle. It's as if BMW's Southern California design studio channeled the unholy lovechild of William Gibson and Phillip K. Here is a plot of the speed of Felix as a function of altitude in terms of the Mach number (again, this is based on my not so perfect model). It has the definition of Mach number as the ratio of the speed of an object to the local speed of sound. This is consistent with the general relationship for sound speed in gases. I guess I was right ( at least according to Wikipedia). The speed of sound in helium at 0C is about 972 m/s, compared to 331 m/s in air. You should also notice that this calculation has his maximum speed a little over the reported value of 373 m/s - hopefully I can fix this later when I compare my model to the real data - but it's not too far off. You will notice that from this numerical calculation, Felix was going faster than the local speed of sound for about 45 seconds. Here is a plot of the speed of Felix as he falls along with the plot of the local speed of sound at that same time. The actual speed depends upon the medium (for example. I am using it to mean the speed of sound at the current altitude. Sound Speed (or sound velocity) refers to the speed of sound waves passing through an elastic medium. I don't know if "local speed of sound" is an official term, but I like it. Was he also going faster than the speed of sound for the altitude he was at? Well, it makes logical sense that if the speed of sound is greatest at sea level and he went faster than the speed of sound he would be going faster than the locals speed of sound. ![]() Did he fall faster than the speed of sound at sea level? Yes. The time it takes the sound wave to complete one period was measured, and this time was used to determine the speed of sound. Smart TVs and streaming devices Note: Playback speed may not be available on all smart TVs and. However, the question doesn't really make sense. You can play a video at different speeds on many devices. Just from this data, you can see that Felix Baumgartner did indeed fall faster than the speed of sound. If you move up to 120,000 feet, the speed will drop down to around 200 m/s. At sea level, the value is right around the 340 m/s mark. See: DOPPLER EFFECT, ECHOLOCATION, SONAR, SONIC BOOM, SUBSONIC, SUPERSONIC, SUPERSONIC TRANSPORT, WAVELENGTH. For each degree Centigrade increase in temperature, the speed of sound increases by 0.61 m/sec or 2.0 ft/sec. Propagation speeds for other media are given in the chart below. At 0° Centigrade and 1.013 x 10 5 Newtons per square meter (normal atmospheric pressure), the speed of sound is 331.5 meters/sec, i.e. In air, for instance, temperature and atmospheric pressure are significant factors. See also: ACOUSTIC IMPEDANCE, PARTICLE VELOCITY, REFRACTION, SOUND PROPAGATION. The speed of a SOUND WAVE varies greatly when propagated in different media, the PROPAGATION velocity depending on the elasticity (or compressibility), temperature and density of the medium in question.
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