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In our interviews , we often inserted devil ’ s advocate questions , asking they why not do something else . " They why did n't she get married to Nazeer ? How will each different length of the ruler vibrate when plucked ? It gets even harder if one takes into account the fact that the block vibrates when it is struck , and that the energy loss due to vibrations depends on the impact point . On his belt , where most people clip wireless pagers or cellular phones , Furnish wears a black detector roughly the size of a calculator that vibrates whenever he gets close to radioactive material . But you can set your watch to vibrate when caller information comes in.Bluetooth technology - - which allows data to be transmitted to devices within 30 feet of each other - - has been around for more than five years . If you're so concerned about those 9/11 terrorists , they why are n't you concerned at all about how it is now February of 2006 , hundreds of billions of dollars have been spent in this War on Terror , and Osama bin Laden is still threatening us from his hidey-hole in Pakistan ? He has developed a technique in which an aircraft 's wing is covered with flexible plastic panels which vibrate when an electric current is passed through them , producing sound . Second , a clear element in front of the sensor vibrates whenever you turn the camera on or off to shake loose any dust . The tympanic membrane is a thin membrane that vibrates when sound waves strike it . It vibrates when your insulin reservoir is completely empty , and you can feel it , tell that it is vibrating . What kills me here is that somehow , someone perceives this category to be a burden to administrate - if it is not a burden , they why eliminate it ? Typically , a small box , with a directional arrow , emits an audible tone or voice message and vibrates when the walk interval begins . Figure 1 shows a string vibrating where the length of the string is equal to a half-wavelength . The frequency of a wave refers to how often the particles of the medium vibrate when a wave passes through the medium . Some equipment was highly desired , such as the Wiggle Pen ( a battery-operated pen that rapidly vibrates when activated ) . If he will not do that , they why all this shamming , these false and lying words and juggler 's tricks ? It vibrates whenever you receive an e-mail or to the beat of an MP3 tune . It should not vibrate when you touch it lightly .