Physics, 28.12.2019 06:31 seider7997

Two bodies of masses 5 and 7 kilograms are initially at rest on a horizontal frictionldess surface. a light spring is compressed between the bodies, which are held together by a thin thread. after the spring is released by burning through the thread, the 5 kilogram body has a speed of 0.2 m/s. the speed of the 7 kilogram body is (in m/s).

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Answer from: dion27

The veolcity of the 7 kilogram body is approximately 0.14 meters per second

Explanation:

Here we have to use the conservation of linear momentum for the bodies asumming the force of the spring an internal force on the system formed by the two blocks. So the change on linear momentum ( $\overrightarrow{p}$ ) has to be zero.

$\varDelta\overrightarrow{p}=0$

$\overrightarrow{p_{f}}=\overrightarrow{p_{i}}$

The final momentum $\overrightarrow{p_{f}}$ is the sum of the final momentum of each block, and initial linear momentum $\overrightarrow{p_{i}}$ is zero because the blocks were initially at rest, so:

$m_{5}\overrightarrow{v_{5}}+m_{7}\overrightarrow{v_{7}}=0$

It's important to note that the linear momentum is a vector quantity so the direction of the velocities are important, assuming positive the velocity of the 5 kilogram body

$m_{5}v_{5}=-m_{7}v_{7}$

$v_{7}=\frac{-m_{5}v_{5}}{m_{7}}=\frac{-(5)(0.2)}{7}$

$v_{7}\approx-0.14\,\frac{m}{s}$

The speed is 0.14 meters per second and the negative sign means the direction is opposite of the 5 kg body velocity.

Answer from: Quest

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 $\frac{1}{3}$ . (i crazy)

most famous scientist who contributed to this physics are:

max planckalbert einsteinerwin schrödingermany

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:

superposition (where 1 thing can be this and that at the same time),entanglement (where two particles are seemingly connected by some sort of unknown (or known) force, energy, matter (i know all that can be the same at least it was at the beginning)

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

Answer from: Quest

this would be about 43%

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