Abullet of mass m1 = 5 g is moving with speed v1. it strikes a block of mass m2 = 6 kg that is hanging at rest from a cord. the bullet embeds itself into the block and the bullet and block swing up on the cord, coming to rest at a height h = 2 cm above the original position of the block. what is the correct expression for momentum conservation when the bullet strikes the block?

The initial velocity of bullet is 7518.26 m/s.

Explanation:

Given that,

Mass of bullet = 5 g

Mass of block = 6 kg

Height = 2 cm

We need to calculate the velocity

Using conservation of energy

We need to calculate the velocity of bullet

Using conservation of momentum

Put the value into the formula

Hence, The initial velocity of bullet is 7518.26 m/s.

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.

they should be similar or the same