0 6868 6876 6882 6886 6892 6894 6898 6904 6906 6912 6918 6922 6924 6928 6934 6936 6942 6946 6948 6952 6954 6958 6960 6962 6963 6964 6966 6967 6968 6970 6972 6976 6978 6982 6984 6988 6994 6996 7002 7006 7008 7012 7018 7024 7026 7032 7036 7038 7044 7048 7054 7062 11751 16 CHE GIOCANO CON LE SLITTE E 8 CHE STANNO FACENDO MEREDA RemoveWGA_12.exe live in a different culture and i cannot without you batterylog 电磁感应强度 it;s not visible HAPPY NEW YEAR EVERYBODY A man has to be five C: considerate. Cheerful. Charming. Self-confidence. Creative 为了实现我的理想， 9点了，我要去睡觉了 we can be a wanderful partner 你在我心的某个位置 The Jean table was created for the E 1027 summer villa, which Gray designed with Jean Badovici. Every room in the house was furnished with one of these steel and wood tables. Is what a suck! 其实你知道她有些懒 喜欢赖床 而且不乖 喜欢在你跟前调皮捣蛋 她在陌生人面前会笑笑 很冷漠 在认识的人面前有点小放肆 很霸道 喜欢在你跟前没形象的调皮 她也会偶尔的忧郁 朋友问她怎么了 她也只会说没事 其实她只是感觉累了 她只是需要你一个拥抱 How does sound travel in air? n Longitudinal wave Longitudinal wave –air molecules vibrate back and forth air molecules vibrate back and forth along direction of wave along direction of wave ?Analogy with opening and shutting a door periodically: Open door inward: a compression travels across room (via molecules pushing neighbors) Close door: a rarefaction travels across room –some molecules are pushed out of room so leave lower pressure behind. Note again Note again: medium (air molecules) are : medium (air molecules) are not transported across the room; rather the disturbance, and energy, are. Swing door open and shut periodically –get periodic compression-rarefaction wave across the room. ?Tuning fork –is exactly this action on a smaller, faster scale: prong vibrating is like the door opening and shutting. Note:、compression and rarefaction travel in the compression and rarefaction travel in the same same direction direction ?Radio loudspeaker –cone that vibrates in synch with electric signal, causing neighboring air molecules to vibrate …eventually sound wave filling the room going window shopping I welcome any questions from you regarding my application 爱失去 最大限度降低影響自然生態環境 cao your bab cao your dad 1.12 Inventory – the possibility to place advertisement 3. MEDIA THAT TRANSMIT ?Air is most common but is a poor conductor. ?Solids and liquids are good conductors. ?A medium is required. ?Video - Vacuum Pump The elasticity elasticityof these materials of these materials rather their than theirdensities densitiesaccounts for the accounts for the different speeds. 9. 2.7. Требования к отправке труб II love you for a long time to one night stands and stem dead you I love you for a long time to one night stands and stem dead you 使自己的设计逐渐走向成熟 中国著名旅游景点 奖杯 这么晚了。为什么还不睡？ 你到中国别忘毕业证件 可能是其他法律规定的不法行为，损害或妨碍社会公众共同享有的人身或财产权利， 你是一个开放的男孩，但是我妹妹很善良，她不会伤害别人，我不希望别人来伤害她 杨瑞 Sound travels in other media too Doesn’t have to be air –just has to have an elastic property i.e be able to change shape in response to an applied force and then resume its original shape once force is removed. Eg. putty is not elastic but steel is . n Sound generally travels fastest in solids, then in liquids, and slowest in gases Eg. 15x as fast in steel as in air and 4x as fast in water as in air . Also, generally less dissipation (ie fading away) in solids and liquids than in air, Eg. Can hear a distant train coming more clearly if put . ear against the rail Eg. Motors of boats –or fingernails clicking -sound much louder to someone under water, than to someone above. i.e. Liquids and crystalline solids are much better conductors of sound. n Sound needs a medium –won’t travel in a vacuum since nothing to compress and expand 我在网上下载一张照片，你就是那种表情 沵最珍贵゛ IN OGNI BUCA NASCONDE 5 OSSI 工程师证 Дополнительные выгоды 它作为一个通用的术语，描述的仅仅是行为的结果——给他人造成的不便。 you are such cute – Сущность продукта(продукт по замыслу); – Фактический продукт; – Дополнительные выгоды. 幼稚、 4. SPEED OF SOUND IN AIR ? Much slower than light Much slower than light Speed of light is a million times as great -Hence, we see lightning before we hear thunder -Hence, we see a distant tree fall to the ground before we hear the thud… Note that low and high pitches all have the same speed –they differ in frequency and wavelength (long for low, short for high), such that the product freq x wavelength = vis same. ? Depends on wind, temperature, humidity ? Does not depend on loudness (amplitude), nor on pitch (frequency). 小妍，咱的小幸福
