An oxygen gas is flowing through a 10m circular tube length with a radius of 16cm. Oxygen concentrations in the pipe ends are 30 kg/m^3 and 10 kg/m^3. The diffusion constant of the oxygen at 20 ° C is 1.8 x 10^-5 m^2/s. (a) Calculate the diffusion flow rate (b) How many kilograms of oxygen will flow through this tube in 15 minutes? (c) What is the oxygen concentration 2m away from the end of the tube where there is high concentration? (d) How long will it take 100 kg of oxygen to travel this tube?

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.

a skateboard rolling across the street - apex

the right answer is 0.3 meters per second