Aventuri meter is a device for measuring the speed of a fluid within a pipe. the drawing shows a gas flowing at speed v2 through a horizontal section of pipe whose cross-sectional area is a2 = 0.0510 m2. the gas has a density of rho = 1.30 kg/m3. the venturi meter has a cross-sectional area of a1 = 0.0381 m2 and has been substituted for a section of the larger pipe. the pressure difference between the two sections is p2 - p1 = 81.0 pa. find (a) the speed v2 of the gas in the larger original pipe and (b) the volume flow rate q of the gas.

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positive reinforcement? ?

i believe the answer is a hope it and is correct

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me