(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A loudspeaker produces a musical sound by means of the oscillation of a diaphragm whose amplitude is limited to 0.9 µm.

At what frequency is the magnitude a of the diaphragm's acceleration equal to g?

2. Relevant equations

[tex]a=-\omega^2 x_m \cos(\omega t +\phi)[/tex]

3. The attempt at a solution

I decided to chuck the cosine term overboard to see what happened... and I got the right answer (525.45 Hz)! Why am I allowed to maximize the cosine term if I'm not told that the diaphragm is constructed to maximize efficiency?

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