4. a subsonic wind tunnel with an area ratio of 1/6 is operating at standard sea level conditions. a. if the test section speed is 44 ft/s, what is the pressure difference between the settling chamber and the test section? b. if the pressure in the settling chamber is 2000 lb/ft2, what is the pressure in the test section? c. the exit of the diffuser has an area that is 7 times the size of the test section. what is the velocity at the exit of the diffuser? d. what is the pressure at the exit of the diffuser?

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.

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.