A 40-kg skater is standing still in front of a wall. By pushing against the wall she propels herself backward with a velocity of -1 m/s. Her hands are in contact with the wall for 0.80 s. Ignore friction and wind resistance. Find the magnitude and direction of the average force she exerts on the wall (which has the same magnitude, but opposite direction, as the force that the wall applies to her). magnitude N direction

The force the skater exerts is 50 N

Direction: towards wall

Explanation:

The impulse is equal to:

The average force is:

Where

vf = final speed = -1 m/s

vi = initial speed = 0

m = mass = 40 kg

Δt = time interval = 0.8 s

Replacing:

(force applied by the wall)

The force the skater exerts is

Fsk = -Fave = -(-50) = 50 N

Direction: towards wall

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.