Water flows at speed of 5.9 m/s through a horizontal pipe of diameter 3.1 cm . The gauge pressure P1 of the water in the pipe is 1.5 atm . A short segment of the pipe is constricted to a smaller diameter of 2.1 cm. What is the gauge pressure of the water flowing through the constricted segment?

The pressure will be 36169[Pa]

Explanation:

We can solve this problem using the Bernoulli principle, so we have to identify the initial data of the problem.

Now we can state the Bernoulli equation

As the fluid inside the pipe does not undergo considerable height changes the last term on the right and left side of the equation can be canceled.

Therefore:

The density is the same both at the inlet and at the outlet of the pipe.

In bernoulli's equation we have to find the value of Velocity V2, so we can then clear the pressure value P2. To be able to find V2 we have to find the value of the flow that circulates inside the pipeline and then find V2

Now:

Now we can find pressure P2

sleep paralysis is a parasomnia, events associated with sleep.

sleep paralysis happens when you are in the middle of waking up or falling asleep. it is the feeling of being conscious but unable to move. it definitely involves hallucinations.

i had a friend that had sleep paralysis and he told me a story one time where he was laying in bed and he couldn't move his body no matter how hard he tried and there was someone standing in the corner of his room coming towards him. he couldn't move and you can't "wake up" because you are already conscious. sometimes sleep paralysis can be triggered by frequent waking up during the night based off of multiple trips to the bathroom, or if you had ever been abused, sleep paralysis can start happening from things like that.

prolly a beacuse the momentuem the car has increases while going down hill