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LekaFEV [45]
3 years ago
14

When a rock is held above the ground, we say it has some potential energy. When we let it go, it falls and we say the potential

energy is converted to kinetic energy. Finally, the rock hits the ground (and stays there). What has happened to the energy?
Physics
1 answer:
snow_lady [41]3 years ago
8 0

Answer:

Energy converted to heat and sound. Deformation of soil or ground may also take up some energy.

Explanation:

When the rock hits the ground, a part of the energy is converted to heat (thermal energy) and sound. If the ground is soft, it will be compressed by the rock when it lands. This deformation of the ground will take up some of the energy.

We can think of kinetic energy being transferred to the ground in the following way:

1. Ball hits the ground, and transfers kinetic energy to lots of soil particles.

2. Soil particles move a bit and transfer the energy to soil particles ahead of them.

3. Kinetic energy is transferred to a very large number of soil particles, and they move so little that we consider this vibration motion.

4. This small vibration motion is now considered as internal energy or 'heat'.

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ale4655 [162]

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The main purpose of the circulatory system is to transport blood, oxygen, nutrients and hormones to and from different cells and tissues throughout the body.

Explanation:

This system works hand-in-hand with the respiratory system to facilitate the exchange of oxygen and carbon dioxide within the blood per the alveoli in the lungs.

8 0
3 years ago
What is the most common source of energy for surface waves
Elanso [62]

Answer:

The most common source of energy for surface waves is wind. earthquakes. tides. volcanoes.

Explanation:

5 0
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For a projectile, which of the following quantities are constant during the flight: x, y, vx, vy, v, ax, ay? Check all that appl
geniusboy [140]

Answer:

C. vx

F. ax

G. ay

Explanation:

The projectile moves along a curved path towards the ground, so its x and y positions change.

Since there is no applied force in the x-direction, the acceleration in the x-direction is zero. This means, ax and vx do not change.

The projectile is under the influence of gratify, which is directed towards the ground. So its velocity increases, because its y-component of the velocity increases.

However, the y-component of its acceleration is constant, since it is gravitational acceleration.

5 0
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What feature of a battery affects how often it needs to be replaced?
Gnoma [55]

Answer:

c.lifespan or battery lifespan

Explanation:

"Battery Lifespan"affects how often it needs to be replaced

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3 years ago
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romanna [79]
It implies the following thing. If you draw a vector connecting the Sun and a planet this vector will be covering equal areas in equal time spans. Say, each second, this vector covers N square meters, each 2 seconds - 2N square meters and so on
4 0
4 years ago
Read 2 more answers
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