if a tree falls in the woods and no one is around to hear it, does it still make a sound?
i'm going to give you the answer already because autumn got it wrong. first she spelled the example of s. cat wrong. sound is an vibration but, i heard many answers and somehow people say sound can be many forms which it cannot. a rock cannot hear the sound but when the tree falls down next to it the rock will be effected by the vibration.
yes, sound is a vibration. just because no one is there to hear the vibration doesn't mean the vibration didn't occur. if you talk to a deaf person does it mean you're not talking because they can not hear you? of course not. this question has always seemed absurd to me.
'no' is the answer to your first paragraph question. the tree moves slightly after being hit, thus conserving momentum. the tree soon stops swaying and reverses direction due to forces applied to the roots by the soil.

your second paragraph does not correctly state the law of conservation of energy. you are talking about momentum conservation. in the case of the tree hit by the snowball, there is a net force applied to the system (at the tree's roots). hi,
all physical changes are not
reversible cutting of tree is an irreversible physical change
all chemical changes are not
necessarily irreversible

the reaction between hydrogen and oxygen to form water is an
example reversible chemical reaction the reaction can be
represented as:
h2 + 1/2 o2→ h2o we’re being asked which of the following conditions occurs when a chemical change happens to a piece of wood let’s first define a physical change and a chemical change.physical change → there is a change in a matter as it goes from one physical state to another.chemical change → atoms rearrange themselves to create a new substance. now, let’s take a look at each condition:[readmore]a. is splitsplitting wood is only reducing its size. physical changeb. is paintedpainting wood is only placing paint on top of it and not really affecting the composition of the wood.  physical changec. decaysdecaying changes the integrity of the wood itself and transforms it into things like soil. chemical changed. is cutcutting wood is only reducing its size. physical changea chemical change occurs when a piece of wood c. decays. music 302 music in world culture week 2 lecture notes what is music? -depends on personal perspective, taste, and aesthetic -perception of what music is can also depend on culture aesthetic -what is beautiful/pleasing; one's sense of beauty -perception through the senses taste -discerning what is appropriate -often based on culture, society, personal liking or disliking criticism -analysis and evaluation analysis -separation of a whole into its components evaluation -assigning value based on merits and faults * taste and criticism depend on one's aesthetic elements of music pitch -scientific definition: the frequency of vibrations per second more frequent- higher pitch less frequent- lower pitch -musical definition: the location of sound in the tonal range proceeding f when the water on the surface of the ocean rises and falls alternately, they are called waves. during a storm, the winds blowing at very high speed form huge waves. these may cause tremendous destruction. people do vote, regardless if they cast a ballot. silence can be thought of as a vote. the reason i say this is that i chose not to vote out of no confidence for the ballot. i would either have voted for something in which i did not believe, or i couldn't "thrown away" with a 3rd party vote, in which i still didn't believe.there is no write in option for "no confidence," and interestingly, if enough people voted this way, the way american voting works, would require either the candidates to all be thrown out, and a new set of candidates, or the government would make their own choice, at which point democracy would be dead. if we look at voting in this manner, it most certainly is compulsory. however, america has an odd obsession of thinking that the common man's vote for president actually matters. local votes will influence politics for a person far more than a presidential vote ever will. this is why many localities have gerrymandering, in order to control the constituency and votes.i personally do not believe my vote will ever make a difference, as it never has in any political election. besides, perpetuating the idea that the common man isn't controlled by our plutocratic corporatist "democracy" is silly, but people will keep on voting and believing that they matter, or are heard. perhaps my view is cynical and pessimistic. i see no reason to change it.c'est la vie. an abnormal sound heard due to blood flow turbulence in your carotid artery. this sound can be attributed to a carotid artery aneurysm, dissection or partial blockage, or the same diagnoses in the aortic artery further upstream. please see a vascular surgeon or cardiologist for proper diagnosis and treatment. thanks for trusting in healthtap. see more... when a ray of light falls on a smooth and shiny surface, the whole of light is sent back in the same direction. it is called reflection. mirrors do not allow even a small amount of light to pass through them. mirrors show regular and complete reflection.when all the parallel rays reflected from a plane are not parallel, the reflection is diffused or irregular. this is not violation of law of reflection, the reason for diffused reflection is due to irregularities in the reflecting surface. imagine you are sitting inside a moving bus. when you look outside you will observe that you are moving. now look to the roof of the bus. with respect to the roof of bus, you are at rest. hence it is concluded that rest and motion are relative terms. we can do hearing tests as often as necessary. but usually not. once you have a hearing loss, if can fix it, unless there a determination in hearing, you may not need another one. see more...