Athin metal bar, insulated along its sides, is composed of five different metal connected together. the left end bar is immersed in a heat bath at 100°c and right end in a heat bath at 0°c. starting at the left end, the pieces and lenghts are steel(2cm), brass(3cm), copper(1cm), aluminum(5cm) and silver(1cm). what is the temperature of the steel/brass interface?

T = 61.06 °C  

Explanation:

given data:

a thin metal bar consist of 5 different material.

thermal conductivity of ---

K {steel} = 16 Wm^{-1} k^{-1}

K brass = 125 Wm^{-1} k^{-1}

K copper = 401 Wm^{-1} k^{-1}

K aluminium =30Wm^{-1} k^{-1}

K silver = 427 Wm^{-1} k^{-1}

WE KNOW THAT

total resistance of bar = R steel + R brass + R copper + R aluminium + R silver

let T is the temperature at steel/brass interference

will be constant throughtout the bar

therefore we have

solving for T  we get

T = 61.06 °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.

does anyone know or what?