Physics, 22.10.2019 03:00 loveuncondition

Abook is pushed with an initial horizontal velocity of 5.0 meters per second off the top of a desk. what is the initial vertical velocity of the book, in m/s?

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Answer from: whitbol

Initial vertical velocity of the book is 0 and for better understanding refer the below solution.

Given :

Horizontal Velocity, $\rm V_x$ = 5 m/sec

Solution :

The velocity of the falling book in its trajectory is the resultant velocity. Due to the action of gravity, it keeps on increasing with time.

So,

$\rm V_R = \sqrt{V_x^2 + V_y^2}$ ----- (1)

Since the resultant velocity is equal to the horizontal velocity that is,

$\rm V_R = 5\; m/sec$

Now put the values of $\rm V_x \; and \; V_R$ in equation (1) we get,

$\rm 5 = \sqrt{5^2 + V_y^2}$

$\rm V_y = \sqrt{5^2-5^2}$

$\rm V_y = 0$

Therefore, initial vertical velocity of the book is 0.

For more information, refer the link given below

link

Answer from: danielanderson12

The Initial vertical velocity is zero

Explanation:

Given that,

A book is pushed with an initial horizontal velocity, Vx = 5 m/s

According to projectile motion, the horizontal component of velocity i.e., in X-axis remains the same though out its path.

The vertical velocity varies i.e., the velocity towards the Y- axis.

The velocity of the falling book in its trajectory is the resultant velocity. Due to the action of gravity, it keeps on increasing with time.

The resultant velocity is given by relation

$V_{R} = \sqrt{{V_{x}^{2}} +[ {gt}]^{2} }$

where

gt = Vy - vertical velocity

g - acceleration due to gravity

t - time

Since, the initial horizontal velocity at that instant is equal to the resultant velocity.

Vx = 5 m/s

$V_{R}$ = 5 m/s

So, on substituting in the above equation

Vy = 0 m/s

Therefore, the initial vertical velocity is equal to zero

Answer from: Quest

answer: the direction of the wind is expressed as the direction from which the wind is blowing. for example, easterly winds blow from east to west, while westerly winds blow from west to east.

explanation:

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.

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Abook is pushed with an initial horizontal velocity of 5.0 meters per second off the top of a desk....

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