is a snowflake traveling the same speed  from begining to end?
152021
Snow flakes do not fall at a constant speed. They start out slow, and will often be caught in updrafts that will halt or slow their downward progress or even make them temporarily rise. Snow flakes will accelerate until they reach their terminal velocity [1]. \n\nBy the time we encounter snowflakes, they are falling at a roughly constant rate, as long as there is no wind. This is called the terminal velocity, which is reached when the acceleration of gravity is balanced by the frictional force of the air [1].\n\nFor something like a snowflake, the terminal velocity is usually very slow. According to the attached reference [2], the terminal velocity of snowflakes varies between 1.5 mph and 9 mph, depending on the shape and density of the snowflake (for comparison, human beings fall at about 125 mph). The reference [3] gives a more complete summary of the terminal velocities of a variety of different snow flake shapes. A discussion of the relation between snowflake size and terminal velocity is also attached [4](there appears to be some controversy about the correlation of these variables). \n\nThe fastest snowflakes are those that are "rimed", that is, that have fallen through regions of supercooled water vapor, so extra ice builds up on the snowflake as it falls.  \n\nIf one couples the very minimal terminal velocity of snowflakes with their tiny mass, they will have a very small momentum, translating into a tiny force delivered to your skin, so they will hurt very little. The typical mass of a snowflake is 3 mg [5]. It would have a kinetic energy of about 6.7419e-007 Joules at terminal velocity, and a falling 220 lb man has a kinetic energy of about 1.56e6 Joules at terminal velocity. That is, it would take 2.31e11 falling snowflakes to produce the kinetic energy of one falling 220 lb body; about 230,000 million snow flakes, or about 1.53 million pounds of snow. \n\nIt might be noted that snowflakes fall much slower than raindrops, which fall at 5 to 20 mph [6], so raindrops can deliver more force than snowflakes can for "precipitation objects" (snowflakes or raindrops) of the same mass. \n\nAll of this analysis assumes that there is no wind involved. Of course, if the snow and/or rain is being driven by wind, it can strike at greater speeds (but maybe less than the speed of the wind, given the air resitance of the drop or snowflake). \n\nHail stones can have much greater terminal velocities (40 mph for pea size hail, and greater terminal velocities for bigger size hail)[7]. Therefore, hail stones can really do serious damage. Having grown up in regions that get a lot of hail, I have seen hail stones as big as grapefruit that break car windows, dent cars, punch holes in buildings, plow under crops, strip leaves and bark and branches from trees, and would probably injure or kill people caught in the barrage. A hail stone that is 2 inches in diameter (51 mm) will fall with a terminal velocity of almost 72 mph [8,9], delivering 28.9 Joules of energy. I guarantee, if that hits you, you will feel it.
178453
Ignore the other retards who answered this.  This is actually a very intelligent question.  If you look into Einstein's theory of special relativity, you will see that no matter how fast you go (including light speed itself) light will always appear to be traveling at the same rate to you.  That means that you would still observe your headlights the same as usual.  They would still be ahead of you.  That also means that your time is slowing down greatly.  If there were a video camera on you while you were traveling this fast and someone were watching you on a monitor from the comfort of their own home, it would appear to them that you are almost frozen in time because your time reference would be so slow.  To you, your time would seem to go by at a normal pace.
780136
Different trajectory?
95097
If you look at an individual snowflake you will find that the frozen water it contains is quite clear. It is only snow in drifts that looks white. Why? Because snow in drifts is  made up of millions of tiny pieces of ice.\n\n\nEvery time light passes from one substance to another rit changes direction. So when you see something underwater it looks like it’s in a different place to where it is because the light has changed direction moving from the water to the air.\n\nWhen light changes direction like that it also gets split up into different colours  a bit, just like if it had passed through a prism.  It isn’t split as completely as if it has passed through a prism, but the blue light gets split out just a bit more than the red. And every time it changes direction it gets split more and more.\n\n\nWhen light passes through a snow drift it will change direction every single time it shines into every individual snowflake. So light shining on a snowdrift changes direction millions of times. And every time it changes direction it gets split up a bit more. By the time it has shone right through the drift it has changed direction so many times that it has completely split into all the separate colours.\n\nWhen your eyes see an object that is producing light in al the different colours at once it registers that as white. And because the light shining through a snowdrift been split into all the different colours the snow becomes white.\n\nIce on a stream or lake on the other hand is a single block, not millions of pieces like a snowdrift. When light shines through a block of ice it changes direction just twice: once when it enters the ice and once when it leaves it. It doesn’t change direction often enough to get split up very much, so the light coming though looks normal, and not white. The ice appears clear.
214123
they say no two snowflakes are alike, but they are usually hexagonal in shape, although some can be three sided, 12 sided, or just plain irregular\n\nfor more info into how many shapes check:
924645
The molecular structure defines the identical angles of the snowflake, and the fact that all parts usually form simultaneously in a cloud with nothing restricting the crystal's growth makes it likely that all pieces form at the same rate and are nearly identical in size -- so the flakes are usually symmetrical.
783093
49 N will slide the penguin, taking g=10 the penguin masses 7kg and the sled 6kg. to get 49N on the penguin it needs to be accelerated at 7m/sec/sec sideways and to do this the sled need to see a force of 13*7 N in excess of 13N so I would estimate that a bit less than 14*7N will do the job.
233087
this is where relativity comes into play. It depends from what viewpoint. speed is always relative to a "fixed" point (which might not be so "fixed" after all). get my drift?
904698
It is the very complicated surface of the snowflakes.  Ice and water may be clear, but some light is reflected, and some gets transmitted.  In the case of snow flakes, which are ice cristals, there is so much surface to reflect off, and light transmitted leaving off the back will strike the next snowflake behind (or the next bit of the same snowflake, deeper in) and eventually reflect back.  Since the shape is so weird, no coherent reflection can be seen, hence no good mirrored surface.  But the light will come back looking the same color as going in, hence white.
689477
There are several ways (even if they are in essence the same) for constructing the snowflake. So I first choose one and I'll tell you the formula you want.\n\nLook, I'm thinking in the snowflake as the limit of the following iteration: Take an equilateral triangle of side m,\ntake the 2 points which divide each side of the triangle in three parts, construct an equilateral triangle with base the middle part of the side, and erase the middle part of the side. With the figure obtained, do the same with the sides: take the 2 points which divide each side of the FIGURE in three parts, construct an equilateral triangle with base the middle part of the side, and erase the middle part of the side. And so on...\n\nDefine P_n as the perimeter of the figure obtained in the n-iteration (P_0 is just the perimeter of the equilateral triangle of side of length m).\n\nIt's easy to check that:\n\nP_n = P_(n-1) + 4^(n-1)\n\nThat's because in the  n-iteration you add the third part of each of the sides of the precedent figure (by construction, you are adding two times the third part of each side and the erasing one time the third part of each side) . So the formula says:\n\nP_n = P_(n-1) + (1/3) * (number of sides of the figure in the n-1 iteration)\n\nBut realize that the number of the sides increases four times in each iteration (just look one side and see how it becomes four lines in the next iteration), and the inicial number of sides is 3 (the sides of the equilateral) so:\n\nNumber of sides of the figure in the n iteration = 3 * 4^n\n\nAnd then:\n\nP_n = P_(n-1) + (1/3) * (number of sides of the figure in the n-1 iteration)\n\nP_n = P_(n-1) + (1/3) * 3 * 4^(n-1)\n\nP_n = P_(n-1) +  4^(n-1)\n\nwhere P_0 = 3 * m , because it's the perimeter of a triangle of side m.
53136
Because each snowflake is actually many, many ice crystals combined.  The probability of having to pseudo-randomly arranged crystal structures being the same is very small. So it goes to say the chances of two snow flakes being made of both the same crystal structures AND arranged in the same order is so astronomical, that it can be stated with mathematical certainty that it cannot exist (i.e no two snowflakes can be the same).
15796
Its not proven but heres how eistine put it.\n\nThe faster you travel the more you weigh. Since light is the fastest moving thing in the universe if you went faster then that you would way infinite pounds and that would be impossible so you cannot go faster than the spped of light
444020
Good question! I think no because everything moves within the atmosphere. Such as 8 hour long airplanes. If they travel the opposite direction of the earth's rotation, it wouldn't just stay still over the same exact spot over the ocean if it traveled 1000mph. good question, but that's what i predict using prior knowledge. Plus, i think it's gravitational force that makes every object move at the same time along with the earth itself. It may have to do with Earth's magnetic field, i don't know.
770917
They are different because there is no reason for them to be identical.  That sounds overly simple, but that is the idea.  There is only one way to be identical, so there are billions or trillions way for them to be different, so what are the odds that two would be equal?  Very low, so low it is virtually zero.\nAs for the symmetry, the condition that makes the flakes grow is that additional molecules of water add to the existing crystal as a function of what conditions exist; and since flakes are small, the conditions are nearly identical around the flake, hence it will tend to grow symmetrically.  But what about a snow flake right besides the first one?  Shouldn't it be growing similarly to its neighbor and thus be identical? Yes, provide that the starting crystal formed at the same moment, and with the same angle (as snow flakes are flat, that means the way they will grow depend on their angle as a function of time). Again the chance two flakes will start growing at the same time, and are at the same angle is essentially non-existent.
788046
Well, yes, but it is impossible to prove.\n\nNo one has ever examined ALL snowflakes.\n\nHowever snowflakes tend to all have a hexagonal shape in most snow.\n\nIn extremely cold weather at the south pole, other crystalline forms of ice are possible but they are very rare.
4310
It is true to say that you cannot feel the "speed" (velocity) of a bus when moving at a constant velocity - - but only in a "perfect" universe - - i.e., no "contact" between the bus and its environment. In reality, you probably perceive high velocity versus low velocity due to changes in vibration, bumps in the road, "wind" whistling, motor engine noise of the bus, etc.\n\nNot only is the earth moving at "constant" velocity (technically, its velocity is decreasing at an extremely low rate; slowing down only as measured over billions of years) - - its "interaction" with its "environment" (in solar system space) is virtually zero.
51113
Yes. It's only true that the chances of any two snowflakes being identical are extremely low, and nobody's checking and cross-referencing them all to see.\n\nIf two identical seed particles took two identical journeys to the ground, you'd have two identical snowflakes. There's no mystical law stopping this from happening apart from the sheer weight of different possibilities available.