Physics, 29.09.2019 03:30 justinchou814

How long must a 0.50-mm-diameter aluminum wire be to have a 0.58 a current when connected to the terminals of a 1.5 v flashlight battery? express your answer to two significant figures and include the appropriate units?

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Answer from: namira16

In the concept of electric circuits, the most famous and basic equation to be used is the Ohm's Law. Its equation is: I = V/R, where I is the current, V is the voltage and R is the resistance. Since, current and voltage are known, we could determine the resistance of the wire. Rearranging the equation,

R = V/I = 1,5/5.8 = 0.259 Ω

Now, the resistance of the wire depends on many factors. Among these are the type of material used, the cross sectional area, the length and the temperature. For the first three factors mentioned, there is an equation relating all of these to the resistance. The equation is

R = ρL/A, where ρ is the resistivity. This is an inherent property of a material. For aluminum, ρ = 3.2×10⁻⁸ Ω-m. The variable L is for the length and A is for the cross sectional area. For a circular wire, A = πr².

A = π(0.0005 m/2)² = 1.963×10⁻⁷ m²

Then, rearranging the equation,

L = RA/ρ = (0.259 Ω)(1.963×10⁻⁷ m²)/(3.2×10⁻⁸ Ω-m)
L = 1.59 m

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

i think they are all correct

explanation:

they seem good

Check if answers are correcti will mark as the brainliest answer

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