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If soldiers march across the bridge with a cadence equal to the bridge's natural frequency and impart $1.00 × 10^4 J$ of energy each second, how long does it take for the bridge's oscillations to go from 0.100 m to 0.500 m amplitude. $ 5 \times 10^7 \text{J} $ . \\ b) $ 12 \times 10^4 \text{s}$ .
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Explanation: