Standing at a crosswalk, you hear a frequency of 510 hz from the siren of an approaching ambulance. after the ambulance passes, the observed frequency of the siren is 427 hz. determine the ambulance's speed from these observations. (take the speed of sound to be 343 m/s.)
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An incident ray through the focal point of a spherical mirror will: reflect through the center of curvature. reflect back through the focal point. reflect parallel to the principle axis. reflect the same direction as the incident ray.
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Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz. what wavelength is produced?
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Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.
Answers: 3
Standing at a crosswalk, you hear a frequency of 510 hz from the siren of an approaching ambulance....
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