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Q. A siren has a frequency of 740 Hz when it is at rest, whereas it has an apparent frequency of 830 Hz when it is moving toward a stationary observer. What is the speed of the siren in the latter case? (For the speed of sound please use 343 m/s.)

Q. A wheel has a radius of 3.6 m. How far (path length) does a point on the circumference travel if the wheel is rotated through angles of 30°, 30 rad, and 30 rev, respectively?

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