Ascuba tank, when fully submerged, displaces 16.7 l of seawater. the tank itself has a mass of 13.4 kg and, when "full," contains 4.47 kg of air. find the total mass of the tank?

Explanation:

As we know that tank itself has mass given as 13.4 kg

so it is given as

also the tank contains air in it and the mass of air inside the tank is also given as 4.47 kg

so it is

so total mass of the tank is the mass of the empty tank and mass of air in the tank

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.

well clustered together.

points close on a scatter diagram