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Offline stana

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A Few Questions
« on: 18/09/2007 18:44:15 »
Okay, I have a few questions. My first being:

Could I smash a glass by squealing? Ive seen on the T.V that a singer went on and screamed at the top of her voice, The glass broke. I don't believe everything i see on T.V, but i knew you guys would know.

Ive heard about this thing. The 'brown noise' I asked my teacher about it and he said, Your muscles will contract and relax when a certain frequency sound is made. So, does that mean a sound on the T.V or the radio or on a phone, could relax my muscles, or maybe even stop one? e.g the heart.

Howcome birds don't get fried? I was walking home a few nights back, and i seen alot of birds on the electricity Pylon wires. I was wondering how they done that? Cause if i did that, i would die. I know that they aren't affected because the current goes right through them, and back out through another exit, But howcome that law doesn't apply to me? Or does it?

Why doesn't alcohol freeze. My uncle bought some vodka a few weeks back, and he put it in the freezer. It didn't freeze? He said because it was PURE alcohol. But..everything freezes, if i get some water, and put it in the freezer, it will freeze, so will coca-cola, or ribena.

Did we evolve?  I'm not trying to start a religious debate or anything. I just want to know, Did we evolve from monkeys?

What is Absence? Ive seen it in my science lab, the teacher said it was 90% alcohol!? Is it illegal, and what are its effects?

If i jumped in a falling lift at the last minute, would it save me? Ive been told that the force of the falling lift would drag me down, and i wouldnt be able to jump or move.

If i smashed a planes window, very high up, would it DRAG me out? Ive seen it on movies before, where someones shot a guy and the window smashed and then all the luggage gets sucked out and everyone holds onto the chairs. Is this true? Or just hollywoodness

Last one. Why if i jump in a moving plane, why dont i fly backwards? Casue in theory, im in the sky. I was told it was something to do with the momentum? Whatever that means


Thanks for reading, and thank you even more if you answered!
« Last Edit: 18/09/2007 18:50:10 by stana »


 

Offline eric l

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A Few Questions
« Reply #1 on: 18/09/2007 18:58:54 »
Let's take your questions one by one.  (next time, make it five posts, so that they can be placed in the appropriate sections)

Why doesn't alcohol freeze. My uncle bought some vodka a few weeks back, and he put it in the freezer. It didn't freeze? He said because it was PURE alcohol. But..everything freezes, if i get some water, and put it in the freezer, it will freeze, so will coca-cola, or ribena.


Alcohol does freeze, but you have to cool it down to -114 C (don't ask how much that is in F).  Even the strongest vodka is not pure alcohol, your uncle's bottle might stay liquid in a household deep freeze, but it would freeze in an installation where products are deep frozen for commercial purposes.

I'll leave the other questions to others for the time being.
 

Offline lightarrow

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A Few Questions
« Reply #2 on: 18/09/2007 19:55:22 »
Okay, I have a few questions. My first being:

Could I smash a glass by squealing? Ive seen on the T.V that a singer went on and screamed at the top of her voice, The glass broke. I don't believe everything i see on T.V, but i knew you guys would know.
Yes, it's possible, even if not so common. Look for "resonance".

Quote
Ive heard about this thing. The 'brown noise' I asked my teacher about it and he said, Your muscles will contract and relax when a certain frequency sound is made. So, does that mean a sound on the T.V or the radio or on a phone, could relax my muscles, or maybe even stop one? e.g the heart.
http://www.mediacollege.com/audio/noise/brown-noise.html

"Brown note", instead, is something different. According to Wiki, there's no evidence of it:
http://en.wikipedia.org/wiki/Brown_note

Quote
Howcome birds don't get fried? I was walking home a few nights back, and i seen alot of birds on the electricity Pylon wires. I was wondering how they done that? Cause if i did that, i would die. I know that they aren't affected because the current goes right through them, and back out through another exit, But howcome that law doesn't apply to me? Or does it?
There has recently been a thread on it; do a simple search.

Quote
What is Absence? Ive seen it in my science lab, the teacher said it was 90% alcohol!? Is it illegal, and what are its effects?
Maybe you meant "Absinthe"?:
http://en.wikipedia.org/wiki/Absinthe

Quote
If i jumped in a falling lift at the last minute, would it save me? Ive been told that the force of the falling lift would drag me down, and i wouldnt be able to jump or move.
Even on this there has been a recent thread.

Quote
Last one. Why if i jump in a moving plane, why dont i fly backwards? Casue in theory, im in the sky. I was told it was something to do with the momentum? Whatever that means
You are inside a moving bus, or train or plane or what you want and you release a body inside it. Why does it touch the pavement near your feet and doesn't fly backwards? Because it's moving at the same bus, train, plane...speed.
 

Offline lightarrow

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A Few Questions
« Reply #3 on: 18/09/2007 19:59:09 »
Okay, I have a few questions. My first being:

Could I smash a glass by squealing? Ive seen on the T.V that a singer went on and screamed at the top of her voice, The glass broke. I don't believe everything i see on T.V, but i knew you guys would know.
Yes, it's possible, even if not so common. Look for "resonance".

Quote
Ive heard about this thing. The 'brown noise' I asked my teacher about it and he said, Your muscles will contract and relax when a certain frequency sound is made. So, does that mean a sound on the T.V or the radio or on a phone, could relax my muscles, or maybe even stop one? e.g the heart.
http://www.mediacollege.com/audio/noise/brown-noise.html

"Brown note", instead, is something different. According to Wiki, there's no evidence of it:
http://en.wikipedia.org/wiki/Brown_note

Quote
Howcome birds don't get fried? I was walking home a few nights back, and i seen alot of birds on the electricity Pylon wires. I was wondering how they done that? Cause if i did that, i would die. I know that they aren't affected because the current goes right through them, and back out through another exit, But howcome that law doesn't apply to me? Or does it?
There has recently been a thread on it; do a simple search.

Quote
What is Absence? Ive seen it in my science lab, the teacher said it was 90% alcohol!? Is it illegal, and what are its effects?
Maybe you meant "Absinthe"?:
http://en.wikipedia.org/wiki/Absinthe

Quote
If i jumped in a falling lift at the last minute, would it save me? Ive been told that the force of the falling lift would drag me down, and i wouldnt be able to jump or move.
Even on this there has been a recent thread.

Quote
Last one. Why if i jump in a moving plane, why dont i fly backwards? Casue in theory, im in the sky. I was told it was something to do with the momentum? Whatever that means
You are inside a moving bus, or train or plane or what you want and you release a body inside it. Why does it touch the pavement near your feet and doesn't fly backwards? Because it's moving at the same bus, train, plane...speed. If you are in outer space and you releas it from the starship's window, is the same. With air, it will be obviously "braked" from it, so it will go a bit backwards with respect the moving body; but it will however go forward with respect a non moving frame of reference (example, ground).
 

Offline eric l

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A Few Questions
« Reply #4 on: 19/09/2007 10:44:37 »

If i smashed a planes window, very high up, would it DRAG me out? Ive seen it on movies before, where someones shot a guy and the window smashed and then all the luggage gets sucked out and everyone holds onto the chairs. Is this true? Or just hollywoodness

This one is not all that simple. 
When flying at high altitude (as in commercial airlines) the pressure inside the cabin is kept much higher than the pressure outside (just to kep passengers comfortable).  Any opening in the fuselage - like a broken window pane - would cause the air from inside the cabin being sucked out by the relative vacuum outside.  As to what will happen when equilibrium is reached, I don't know - I mean I don't know whether air will be sucked in or out, but I know conditions will be very unpleasant.  And if the compressor keeps pumping air into the leaky fuselage, the drag will go on.
As for flying at lower altitudes, better ask a parachutist (paratrooper or amateur), they have experience.  I know for a fact that among the tests required for a licence to fly with passengers, pilots have to fly with a door to the cabin opened.  The draft makes it difficult to keep direction.
 

Offline RD

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A Few Questions
« Reply #5 on: 20/09/2007 16:57:31 »
Quote
Breaking glass sound?
An opera singer hits a high note and this shatters a glass in the drawing room. This may have appeared in the movies, but is it really possible to shatter glass with sound? Below are some results from an experiment carried out at the University of Salford that shows it is possible to shatter glass using sound, but it is very difficult....

So can an opera singer do it?
If amplified, yes it is possible. Unamplified it is very difficult, although it was done on Myth Busters. However, you need to get the glass very close to your mouth, and having spent time picking glass out of a loudspeaker, I wouldn't risk doing it myself. I can, however, break the glass with a clarinet.

http://www.acoustics.salford.ac.uk/acoustics_info/glass/

Video of wine glass breaking with sound ...
http://www.acoustics.salford.ac.uk/feschools/waves/wine1video.htm
 

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A Few Questions
« Reply #5 on: 20/09/2007 16:57:31 »

 

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