What frequency will be heard by a person at the station
Sam, a train engineer, blows a whistle that has a frequency of 5.0 102 Hz as the train approaches a station. If the speed of the train is 33 m/s, what frequency will be heard by a person at the station?
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A spool of wire of mass 5.3 kg and radius 0.73 m is unwound under a constant wire tension 14 N. Assume the spool is a uniform solid cylinder that rolls without slipping. Find the friction force on the bottom of the spool. Let right be positive. Answe
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