The loud speaker A and B are driven by the same amplifier and emit sinusoidal in-phase. The frequency of the waves emitted is 86 Hz. You are standing 10.0 m from speaker A. Calculate the closes you can be to speaker B and be at a point of destructive interference (hear nothing). The speed of sound travel in air is 344 m/s

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Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.