Water (density = 1 ´ 103 kg/m3) flows at 10 m/s through a pipe with radius 0.030 m. the pipe goes up to the second floor of the building, 2.0 m higher, and the pressure remains unchanged. what is the radius of the pipe on the second floor?

density of water =

velocity of flow =

radius of pipe =

Height of second floor =

Now we can use here Bernuoli's Equation to find the speed of water flow at second floor

Now in order to find the radius of pipe we can use equation of continuity

So radius of pipe at second floor is 0.034 meter

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