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Old 10-09-2012, 02:10 PM #1849
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Originally Posted by Supra_MKIII View Post
How are you supposed to break the sound barrier? Isn't the terminal velocity of a person far, far below mach1?
I've wondered about that too, but I think the oft-quoted terminal velocity of 120 mph only applies if you're on your stomach/back.
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Old 10-09-2012, 02:19 PM #1850
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Old 10-09-2012, 02:20 PM #1851
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Quote:
Originally Posted by Supra_MKIII View Post
How are you supposed to break the sound barrier? Isn't the terminal velocity of a person far, far below mach1?
V

Quote:
Originally Posted by cameron122000 View Post
Not entirely sure, but I think it's because he'll be so far up that there's less atmosphere. Gives him less drag.
Correct. Less particle friction, less resistance, same gravity, higher speed.

Quote:
Originally Posted by Supra_MKIII View Post
That makes sense. But wouldn't waves of sound also travel faster at those altitudes?
Sound has nothing to do with "the sound barrier." It's a measure of speed with an associated phenomena. Mach 1 = 340.29 m / s, which is 761.207051 mph.

EDIT: AT SEA LEVEL, for clarification. It decreases as you climb in altitude/drop pressure. That's why the SR-71 went so fast, but also had to fly so high.

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Originally Posted by Oedipus View Post
I've wondered about that too, but I think the oft-quoted terminal velocity of 120 mph only applies if you're on your stomach/back.
"A free-falling object achieves its terminal velocity when the downward force of gravity (FG) equals the upward force of drag (Fd). This causes the net force on the object to be zero, resulting in an acceleration of zero."

It all depends on what you're moving through. Terminal Velocity through Jello.
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Old 10-09-2012, 02:22 PM #1852
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Doesn't 'breaking the sound barrier' have certain phenomena attached with it though? IE are they going to experience those effects, and if so, wouldn't it require a higher velocity to do so at those altitudes? Or are they just using low altitude numbers and saying that's what they're gonna try and achieve?
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Old 10-09-2012, 02:27 PM #1853
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Wiki says mach numbers are the speed of an object moving through fluid divided by the speed of sound moving through said fluid.

So the speed of sound would be different in the air we're breathing compared to anything at super high altitudes, especially in different parts of the atmosphere

Relatively, then, shouldn't it increase similarly to the increase in terminal velocity, and again leave a human unable to come anywhere near it?
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Old 10-09-2012, 02:32 PM #1854
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Quote:
Originally Posted by Supra_MKIII View Post
Doesn't 'breaking the sound barrier' have certain phenomena attached with it though? IE are they going to experience those effects, and if so, wouldn't it require a higher velocity to do so at those altitudes? Or are they just using low altitude numbers and saying that's what they're gonna try and achieve?
Yes. You create a sonic boom, which is a pressure wave, but it has nothing to do with noise in and of itself. Sound through air at sea level etcetcetc travels at 761 MPH. Mach number is Object Velocity/Speed of Sound, which is a measurable constant.

So, I suppose I misspoke. Sound does have something to do with it, but it's a baseline measurement, more than an acting force, which is what I assumed you meant by your question.

120 dB is still 120 dB at 120,000 feet. Noise has a matter component to it (Air mass, etc.) and the less matter it has to fight against, the better.

Mach number is actually a fluid dynamics measurement.

Quote:
Originally Posted by Supra_MKIII View Post
Wiki says mach numbers are the speed of an object moving through fluid divided by the speed of sound moving through said fluid.

So the speed of sound would be different in the air we're breathing compared to anything at super high altitudes, especially in different parts of the atmosphere

Relatively, then, shouldn't it increase similarly to the increase in terminal velocity, and again leave a human unable to come anywhere near it?
Just an educated guess, but the sound of a fart doesn't have the mass of a person. Thus, higher acceleration when put against the constant of gravity.


EDIT:

http://www.redbullstratos.com/science/speed-of-sound/

This actually explains it a lot better than I ever could. I forgot about the temperature effect on pressure.


EDITEDIT:
Goddamnit this kind of **** makes me want to take a ****load of science classes.
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Last edited by GlittermekaiN : 10-09-2012 at 02:38 PM.
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Old 10-09-2012, 02:44 PM #1855
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This is the type of **** I love learning about.
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Old 10-09-2012, 02:46 PM #1856
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Same. But I'm still kind of lost.

It lists 690mph as his goal. Air is less dense at the altitudes he is going to be at, which would imply sound traveling faster. Is the speed slower solely because of the temperature?

**** man. Regardless that dude's gonna be cruising. 700mph outside a vehicle...
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Old 10-09-2012, 02:55 PM #1857
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Quote:
Originally Posted by Supra_MKIII View Post
Same. But I'm still kind of lost.

It lists 690mph as his goal. Air is less dense at the altitudes he is going to be at, which would imply sound traveling faster. Is the speed slower solely because of the temperature?

**** man. Regardless that dude's gonna be cruising. 700mph outside a vehicle...
The pressure waves that are created by sound slow down due to temperature, and as you can imagine it's pretty goddamn nippy at 100,000 feet.


0 - 690 in 40 seconds.
That's 17.25 MPH acceleration, per second.
3.5 second 0 - 60.
That's Carrera GT levels.
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Old 10-09-2012, 02:59 PM #1858
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But I thought the closer you are to the sun, the hotter it gets?
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Old 10-09-2012, 03:02 PM #1859
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But I thought the closer you are to the sun, the hotter it gets?
Only if you're on wax wings.
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Old 10-09-2012, 03:03 PM #1860
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But I thought the closer you are to the sun, the hotter it gets?
Not sure if srs

Edit: da **** I definitely didn't put that smiley in the title of this post
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Old 10-09-2012, 03:06 PM #1861
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Got charged an extra $40 because this **** put two tabs on my card, showed me he voided the transaction but I still check my statement and it charged me for both my tab and my friends.



Lets hope I have my receipt.
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Old 10-09-2012, 03:10 PM #1862
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Man ILS is great.

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Old 10-09-2012, 03:17 PM #1863
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hey guys, guess what

I'm sick again
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Old 10-09-2012, 03:27 PM #1864
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Not sure if srs

Edit: da **** I definitely didn't put that smiley in the title of this post
Definitely not serious.
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Old 10-09-2012, 03:28 PM #1865
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hey guys, guess what

I'm sick again
A gnat must have sneezed near you.

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Definitely not serious.
Welllllll it has to get hotter at some point.
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Old 10-09-2012, 03:29 PM #1866
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A gnat must have sneezed near you.
luckily i'm usually only sick for 2 or 3 days. but still.
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Old 10-09-2012, 03:36 PM #1867
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Definitely not serious.
Was hoping this was the case.

I feel like building something. Wish I had time for a project.
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Old 10-09-2012, 03:44 PM #1868
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Did you finish your desk?
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Old 10-09-2012, 03:57 PM #1869
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****, did I forget to update the thread? I'll make a post when I'm back home. I've been using the desk for months but it's not aesthetically 'finished'.
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