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rjkz [21]
3 years ago
7

A 0.50 kilogram ball is held at a height of 20 meters. What is the kinetic energy of the ball when it reaches halfway after bein

g released?
Physics
1 answer:
Svetach [21]3 years ago
5 0

While the ball is held 20 meters above the floor,

                                   Potential energy = (mass) (gravity) x (height) =

                                                        (0.5 kg) x (9.8 m/s²) x (20 m) =  98 joules.

When it's dropped and reaches 1/2 of its initial height, it has half as much
potential energy.  The rest has turned into kinetic energy  =  <em>49 joules.

</em>
============================================================<em>
</em>

Want to know what else you can figure out ?  Watch this . . . 

                                                 <u> Kinetic energy = (1/2) x (mass) x (speed)²</u>

                                                          49 joules = (1/2) x (0.5 kg) x (speed)²

Divide each side by (0.25 kg):       49 joules / 0.25 kg = speed²

Take the square root of each side:        7/0.5 = speed = <em><u>14 meters per second</u></em>

That's the speed of the ball after falling 10 meters ! 
How cool is that !

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in the derivation of the time period of a pendulum in electric field when considering the fbd of bob to find the g effective why
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Answer:

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The gravity force is highly predictable; it is always in the same direction (down) and always of the same magnitude - mass*9.8 N/kg. The tension force is considerably less predictable. Both its direction and its magnitude change as the bob swings to and fro. The direction of the tension force is always towards the pivot point. So as the bob swings to the left of its equilibrium position, the tension force is at an angle - directed upwards and to the right. And as the bob swings to the right of its equilibrium position, the tension is directed upwards and to the left. The diagram below depicts the direction of these two forces at five different positions over the course of the pendulum's path.

that's what I know so far

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19.8 N force is tending to lift Rover vertically off the ground.

<h3>What is horizontal and vertical component?</h3>

The horizontal velocity component (v_{x}) describes the influence of the velocity in displacing the projectile horizontally. The vertical velocity component (v_{y}) describes the influence of the velocity in displacing the projectile vertically.

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