You\'re watching a carpenter pound a nail. He hits the nailtwice a second, but y

Question

You're watching a carpenter pound a nail. He hits the nailtwice a second, but you hear the sound of the strike when hishammer is fully raised. What is the minimum distance (inmeters) from you to the carpenter? Assume the air temperatureis 20 degrees C. You're watching a carpenter pound a nail. He hits the nailtwice a second, but you hear the sound of the strike when hishammer is fully raised. What is the minimum distance (inmeters) from you to the carpenter? Assume the air temperatureis 20 degrees C. What is the minimum distance (inmeters) from you to the carpenter? Assume the air temperatureis 20 degrees C.

Explanation / Answer

The idea is that his hand hits, rises, hits and rises in onesecond... so the time it takes for him to hit and then raise hishand is 1/4 of a second. . The speed of sound is 343 m/s. So the sound travels for 1/4 ofa second to get to you. . So he is a distance of    343 m/s * 1/4sec =    86 meters from you

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