A force of 0.8 newton causes a spring to extend by 4 cm. What is the spring constant? 20 N per meter
56 N per meter
32 N per meter
40 N per meter

20 N per meter

Explanation:

k = Fe

f = 0.8N

e = 4cm change to m = 4 ÷ 100 = 0.04

0.8 ÷ 0.04 = 20 N per meter

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.

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."