A particle is moving in a circular path of radius r. The displacement after half a circle would be: * 1 point (a) Zero (b) πr (c) 2r (d) 2πr

The displacement after half a circle would be, given after half the circle, the particle will reach the diametrically opposite point from point A to point B. And, we know displacement is the shortest path between the initial and final point. Hence, the displacement after the half-circle is 2r.

Explanation:

Which is choice C

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.