ch15-p071 - amplitude v m = x m . With x m = 0.00075 m and...

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71. (a) The problem gives the frequency f = 440 Hz, where the SI unit abbreviation Hz stands for Hertz, which means a cycle-per-second. The angular frequency ω is similar to frequency except that is in radians-per-second. Recalling that 2 π radians are equivalent to a cycle, we have = 2 π f 2.8×10 3 rad/s. (b) In the discussion immediately after Eq. 15-6, the book introduces the velocity
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Unformatted text preview: amplitude v m = x m . With x m = 0.00075 m and the above value for , this expression yields v m = 2.1 m/s. (c) In the discussion immediately after Eq. 15-7, the book introduces the acceleration amplitude a m = 2 x m , which (if the more precise value = 2765 rad/s is used) yields a m = 5.7 km/s....
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