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* You are standing at position A and your friend at position B on a lake shore (see Figure P11.22). Someone throws a ball so that it lands on the lake surface at point S. The ball produces a circular pulse that propagates along the water surface with a speed of 0.3 m/s. (a) Determine the time that elapses from the moment the pulse reaches you to the moment it reaches your friend. (b) Determine the ration of the pulse amplitudes observed by you and your friend, assuming there is no damping.
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