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Chapter 16 - 16.4

4. The textbook notes (in the discussion immediately after Eq. 16-7) that the acceleration amplitude is

a m = ω 2 x m ,where ω is the angular frequency ( ω =2 πf since there are 2 π radians in one cycle).

Therefore, in this circumstance, we obtain

a m =(2 π (6 . 60Hz)) 2 (0 . 0220m) =37 . 8m / s 2 .