Discussion
A record shows a peak ground acceleration of 0.30 g. Taking g as 9.81 m/s2, this is closest to
Answer: B
Correct answer: 2.94 m/s 2
\[ 0.30 \times 9.81 = 2.94\ \mathrm{m/s^2}. \] Peak acceleration is quoted as a fraction of \( g \) because that fraction is roughly the horizontal inertia force as a proportion of the structure’s weight, which is the form the designer wants. Dividing by \( g \) instead gives 0.031 and multiplying by 100 gives 29.4, both of which are offered as distractors.
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