Physics, 31.07.2019 01:30 julie47d

Asap. ethyl alcohol is to be mixed with water to obtain a mixture with density 900 kg/m3. in what proportion by (a) weight and (b) volume must they be mixed?

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Answer from: maycigrimaldi4990

First of all, let's write the density of water (W) and the density of alcohol (A):
d_W = 1000 kg/m^3

And the relationship between density d, mass m and volume V:
$d= \frac{m}{V} (1)$
The density of the mixture water+alcohol is 900 kg/m^3. The mass of this mixture is the sum of the masses of water and alcohol, and the volume of this mixture is the sum of the volumes of water and alcohol. So we can write
$d_T = 900 kg/m^3 = \frac{m_W +m_A}{V_W+V_A}$ (2)
Now let's solve the two parts of the problem.

a) Let's rewrite (2) by replacing the volumes with $V= \frac{m}{d}$ :
$900 kg/m^3 = \frac{m_W+m_A}{ \frac{m_W}{1000 }+ \frac{m_A}{789} }$
By solving this equation, we find:
$\frac{m_A}{m_W}= \frac{0.1}{0.14}=0.71$
This means that there are 0.71 kg of alcohol per each kg of water in the mixture.

b) Similarly, let's rewrite (2) by replacing the masses with m=dV

:
$900 kg/m^3 = \frac{1000 V_W+789 V_A}{V_W+V_A}$
Re-arranging and solving, we find
$\frac{V_A}{V_W}= \frac{100}{111}=0.90$
This means that there are 0.90 L of alcohol per each liter of water in the mixture.

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

grav forces affect all objects magnetic forces affect magnetic objects and electric currents

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Asap. ethyl alcohol is to be mixed with water to obtain a mixture with density 900 kg/m3. in what pr...

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