dis22-waves I - Discussion 22 Mechanical Waves I Q15.9 Why...

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Discussion # 22 – Mechanical Waves I Q15.9 : Why do you see lightning before you hear the thunder? A familiar rule of thumb is to start counting slowly, once per second, when you see lightning; when you hear the thunder, divide the number you have reached by 3 to obtain your distance from the lightning in kilometers (or divide by 5 to obtain the distance in miles). Why does it work?
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Q15.15: A long rope with mass m is suspended from the ceiling and hangs vertically A wave pulse is produced at the lower end of the rope and the vertically. A wave pulse is produced at the lower end of the rope, and the pulse travels up the rope. Does the speed of the wave pulse change as it moves up the rope, and if so, does it increase or decrease?
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