How long after he drops the rock does he hear it hit bottom
Mr. Physics drops a rock down a 250 meter deep well. Upon impact wit the bottom of the well a short burst of sound is produced with a frequency of 250 Hz. How long after he drops the rock does he hear it hit the bottom of the well?
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: The National Council for the Social Studies (NCSS) outlines a developmental sequence for social studies-the youngest children learn about their neighborhood
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