Apendulum consists of a 2.7 kg stone swinging on a 4.0 m string of negligible mass. the stone has a speed of 8.1 m/s when it passes its lowest point. (a) what is the speed when the string is at 63 ˚ to the vertical? (b) what is the greatest angle with the vertical that the string will reach during the stone's motion? (c) if the potential energy of the pendulum-earth system is taken to be zero at the stone's lowest point, what is the total mechanical energy of the system?

a). v=4.77

b). β=80.61

c). E=88.5J

Explanation:

a).

b).

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.

gravitational energy

electrical energy

kinetic energy

ligh energy