An evacuated spherical diving bell containing a camera is in the ocean at a depth of 145 m. It has a flat, transparent, circular port with a diameter of 17.1 cm. Find the magnitude of the total force exerted by the seawater on the port. For the density of seawater use 1025 kg/m3.
Calculate the total pressure at the given depth by adding up the atmospheric pressure (1.01e5 N/m2) plus the pressure due to the sea water. Evacuated means that that there is no air in the bell.

Explanation:

pressure at the 145 m depth = atmospheric pressure + pressure due to depth of seawater = 1.01 × 10⁵ N/m² + ρgh where ρ is density of sea water = 1025 kg/m3, g = 9.8 m/s² and depth h = 145 m

pressure at the 145 m depth = 1.01 × 10⁵ N/m²  + 14.57 × 10⁵ N/m² = 15.58 ×  10⁵ N/m²

total pressure = F / A

F = total pressure × A

A area = πr² = 3.142 × 0.0855² = 0.02297 m²

F = 15.58 ×  10⁵ N/m² ×0.02297 m² = 3.58 × 10⁴ N

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.

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray