Physics, 06.08.2019 04:10 rscvsdfsrysas3712

To hoist himself into a tree, a 72.0-kg man ties one end of a nylon rope around his waist and throws the other end over a branch of the tree. he then pulls downward on the free end of the rope with a force of 358 n. neglect any friction between the rope and the branch, and determine the man’s upward acceleration.

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Answer from: vivian2020

acceleration a= 0.1344 m/sec^2

Explanation:

Given

mass of the object m= 72 kg

Force applied with help of rope= 358 N

Acceleration due to gravity= 9.81 m/sec^2

Since there is no force acting on the person and rope

then T=F

and from the FBD we can write

2T- mg= ma ,or

2F- mg= ma

$a=\frac{2F-mg}{m}$

now putting the values we get

$a=\frac{2F-mg}{m}$

$a=\frac{2\times358-72\times9.81}{72}$

on calculating we get acceleration a= 0.1344 m/sec^2

To hoist himself into a tree, a 72.0-kg man ties one end of a nylon rope around his waist and throws

Answer from: Quest

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.

Answer from: Quest

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

so, refractive index of medium = 300000/200000 = 1.5

1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

∞ refractive index is usually for opaque mediums. so third medium is opaque medium.

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To hoist himself into a tree, a 72.0-kg man ties one end of a nylon rope around his waist and throws...