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Subject: Re: Distance/ Time Author: QUITTNER [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 10:49:33 02/18/03 Tue In reply to: Randy 's message, "Distance/ Time" on 14:13:05 12/31/02 Tue You wrote: >>> How long is the track? (The speed of sound >in steel is assumed to be 16,000 fps.) <<< ..... Some information is missing. You also must know: What is the speed of sound in the air? The difference between the two sound speeds is a clue; it's also in feet per second. 1) If you know the length of the track then you divide that length by the speed difference (feet/(feet/second)) to get the difference between the sounds in seconds. 2)If you know the time difference between the two sounds then you multiply the speed difference by the time difference between the two sounds to get the track length in feet (seconds times (feet per second)). [ Next Thread | Previous Thread | Next Message | Previous Message ]

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[> Subject: Re: Distance/ Time Author: Enrico D. [ Edit | View ] Date Posted: 23:32:33 03/15/03 Sat >A steel railroad track is struck with a hammer at one >end and sound waves are observed at the other, both >along the track and through the air. What is the time >interval (sec.)between the two sounds as heard by the >observer? How long is the track? (The speed of sound >in steel is assumed to be 16,000 fps.) > >Please give step by step solution. Thanks for your >assistance. If the railroad makes a curve, better a circle, the sound will arrive forst by air than by steel.... [ Post a Reply to This Message ]