While sitting in your car by the side of a country road, you see your friend, wh
ID: 2226946 • Letter: W
Question
While sitting in your car by the side of a country road, you see your friend, who happens to have an identical car with an identical horn, approaching you. You blow your horn, which has a frequency of 260 Hz; your friend begins to blow his horn as well, and you hear a beat frequency of 5.8 Hz. HOW FAST IS YOUR FRIEND APPROACHING YOU?Express your answer to two significant figures and include the appropriate units.
This is a timed question! I only have 7 minutes so a quick, precise answer is appreciated! I will give a 5 star rating to all who answer...please do not copy and paste something from Yahoo Answers. Thanks so much!
Explanation / Answer
260[(343+v)/(343-v) - 1]=5.8 343+v/343-v=1.0223 343+v=350.65-1.0223v v=3.782m/sec=13.6kmph
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