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When responding to sound, the human eardrum vibates about its equilibrium position.  Supposed an eardrum is vibrating with an amplitude of the 6.3*10^-7 m and a maximum speed of 2.0*10^-3 m/s.   (a) What is the frequency (in HZ) of the eardrym's vibration? (b) What is the maximum acceleration of the eardrum?

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