Why tearing of dry paper produces sound?
348028
Why wouldn't it? In tearing the paper air molecules surrounding the sheet are moved, causing longtitudinal vibrations which we percieve as sound? What's the wetness of paper got to do with the price of fish?
1092395
it is LOUD, and even if your house isn't damaged, everything is vibrating.\n\n\nIt sounds a lot like a train going by right outside your window.\n\nAnd afterward, there are tree limbs and odd things lying everywhere.
509021
"The audible noise emitted from high-voltage lines is caused by the discharge of energy that occurs when the electrical field strength on the conductor surface is greater than the 'breakdown strength' (the field intensity necessary to start a flow of electric current) of the air surrounding the conductor. This discharge is also responsible for radio noise, a visible glow of light near the conductor, an energy loss known as corona loss and other phenomena associated with high-voltage lines.
33574
lol thats a funny question i think the reason they make those noises is because there are air pockets in them and when the air pocket bust it goes snap crackle pop lol
178279
Something is out of place or there is a fragment of paper left in there somewhere.  One or more sensor is not happy.
221191
i agree.  sound waves are comparable to waves in a fluid, like water.  A good way to test the reflectivity of a material would be to see how strongly water ripples would bounce off of a wall made of that material.  If you picture disturbing water near a submerged marble wall, you could imagine that the waves would bounce off quite neatly compared to how water may reflect waves from a styrofoam wall or a rough, jagged rock surface.  So, bottom line, dense smooth surfaces produce the best echo.
568730
The theory can best be explained by using the example of a fire truck. When the truck is coming at you, the waves are being compressed because of the truck moving towards you and the distance between the sound waves being shorter, thus causing a higher sound and pitch. When the truck is going away from you, the sound waves are further apart, thus causing a lower sound frequency
431568
Noise of Carpet, The Stereolab
753881
probably a question for an MD, but it could be a decrease in the amount of cartilage that you have between your bones.  the crackling may result from a decease in this cushion, allowing the bones to rub together, giving a crackling sound.
84636
Tearing a paper involves overcoming the cohesive force between the cellulose fibres (of which paper is made). In the case of dry paper this force is high and hence tearing it is not very easy. However, the cohesive force that is of electrostatic origin becomes weakened in the presence of water.\n\nThis is akin to the way table salt (sodium chloride) dissolves in water due the weakening of the electrostatic attraction between the positively and negatively charged ions. In the case of paper, the effect becomes easily perceptible as paper is hydrophilic and absorbs water.\n\nOnce dipped in water, the water molecules can easily flow into the spaces between the fibres, weakening the cohesive force between them and making them susceptible to easy tearing.
1149294
squeaky sounds like brakes, scratching the black-board have very high frequencies. Human ear has an ear-drum which vibrates at same frequency as incoming sound waves. so high frequency sounds cause discomfort within our ears.
676593
As you move your joints you can cause a vaccuum to form in the fluid between the bones. This creates a bubble and when it pops you hear the cracking noise.\nThe cartliage rubbing together on the end of the bones is also a noisy affair.
753087
sounds like the mezzotint
345362
Probably the sound of his ancient bones cracking. Isn't he like 300 years old by now?\n\nWhat does this have to do with Printers, I wonder?
193833
if the paper is use white out
30203
Because when it's hard to tear the paper (newspaper, computer paper, whatever) you're going against the grain of the paper. In that: paper is formed smuching lots of little peices of pulp together, and usually all the pulp is facing one way, if you tear it in a way that goes with it, then it's easy to tear, if you tear the other way you get the zigzag thing that happens because you are tearing it across the line of pulp. Understand? Kind of?
12356
Sounds like static electricty, which tends to develop in windy dry conditions.  Check it out.