If a system stores kinetic energy, which choice must be true?

1. the molecules, atoms, and/or subatomic particles must be exerting forces on each.
2. the molecules, atoms, and/or subatomic particles must be at rest.
3. the molecules, atoms, and/or subatomic particles must be within earth’s gravitational field.
4. the molecules, atoms, and/or subatomic particles must be moving.

4. The molecules, atoms, and/or subatomic particles must be moving.

Explanation:

The only answer can be considered to be true is 4.

The answer 1 refers to elastic potential energy and answer 2 refers to gravitational potential energy.

If a body to store kinetic energy then as the word 'Kinetic' suggest the object should store the energy in form of motion. So only  answer that can be considered is 4.

Option 4: The molecules, atoms, and/or subatomic particles must be moving.

Explanation: Kinetic energy is the energy related to the movement, and is described by the equation:

K = m/2*v^2

where m is the mass of the object and v is the velocity of the object.

Then, if a system is storing kinetic energy, this means that the molecules, atoms and subatomic particles must have a velocity, this means that they are moving, then the correct option is the fourth one.

quantum mechanics or quantum physics is physics of very small objects (particles) and physical entities.

quantum physics has some parallels to our macro world and some pretty unique ideas which theoretically and mathematically proven to be true even though we will never be able to access them because of our size.

there are many types of particles: subatomic, elementary etc.

subatomic means they are smaller than atom, elementary means they are at the very basis of everything.

subatomic particles are for eg. protons, neutrons but not electrons.

elementary particles are categorised into 3 groups by what they do.

these 3 groups are quarks, leptons and bosons.

light for example is a particle more precisely a photon a part of leptons.

proton (subatomic particle) is made out of 2 up quarks and 1 down quark each of these has a fractional charge like . (i crazy)

most famous scientist who contributed to this physics are:

the topic itself us understand a lot and will probably be vastly used in the future (quantum computers, understanding the big bang,

we also must not forget quantum effects like:

and there is more. but probably too much for this answer to be consistent due to my average understanding of this topic.

hope this you understand quantum mechanics a little more. i'm not an expert in the topic (so don't be like wth if you are an expert) but i'm very interested in it.

anyways quantum physics is a very hard topic (harder than physics (perhaps)) therefore searching for every information there is about it and learning it is unfortunately impossible (you can only specialise into 1 - 3 things or more (perhaps

have fun and i wish you luck!

r3t40

what was the acceleration of the 2 kg cart?

⇒ 16.0 cm/s2

what was the acceleration of the 4 kg cart?

⇒ 8.1 cm/s2

what was the acceleration of the 6 kg cart?

⇒ 5.3 cm/s2