A model of a helicopter rotor has four blades, each of length 3.40 m from the central shaft to the blade tip. The model is rotated in a wind tunnel at a rotational speed of 450 rev/min . Part APart complete What is the linear speed of the blade tip? v = 160 m/s Previous Answers Correct Part BPart complete What is the radial acceleration of the blade tip expressed as a multiple of the acceleration of gravity, g? a = 770 ⋅g

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.

hello there!

your answer is a “generator”

a generator does not create energy but instead it transforms it.

it’s basically a motor working in reverse.

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

it has to be b, about 97 percent.