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 Now online (1)recycle ...and 158 guests Last 5 registered Oplandisks nothingstar N_loop yipe foxtrotromeo Browse members... |
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Members 8025Messages 2618642 Today 1 Topics 127849 |
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im home ...alive ... can't hear much can't braethe good. .... but yeah .... ok |
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What? |
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what ??? |
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you saw him live? not bad eh? |
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lol! |
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I don't know what's going on here but it's kind of enjoyable i guess. |
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a music fan's friend |
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--->(-_-)<--- |
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a music fan's friend |
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what is that? |
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The center-of-mass (COM) is the single point on a structure which characterizes the motion of the object if the object shrinks to a point mass. If a net force is applied to the COM the resulting motion will be translation (the object will not rotate). If a net force is applied to some other location on the object, the object will both translate and rotate about its COM. The animations below illustrate this concept. In the middle movie the object is struck to the right of the COM. Now the objects translates and rotates counterclockwise about the COM. Notice that the COM moves in the same straight line as it did when the impact was at the COM. This illustrates that the COM is the single point which characterizes the translational motion of the object. |
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Refraction of Sound Waves Suppose you are camping on the shore of a lake which is not too wide, maybe 1/2 a mile across or so. During the day you can see campers on the other side of the lake, but you cannot hear them. At night, however, you can not only see the campers on the other side of the lake but you can also hear their conversations as they sit around their camp fire. This phenomena is due to the refraction of sound waves. The speed of a wave depends on the elastic and inertia properties of the medium through which it travels. When a wave encounters different medium where the wave speed is different, the wave will change directions. Most often refraction is encountered in a study of optics, with a ray of light incident upon a boundary between two media (air and glass, or air and water, or glass and water). Snell's law relates the directions of the wave before and after it crosses the boundary between the two media. Notice that as the wavefronts cross the boundary the wavelength changes, but the frequency remains constant. |
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i see.... |
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snells law |
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i'm hungary, i think i'll eat some pizza |
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