Two friends, Barbara and Neil, are out rollerblading. With respect to the ground, Barbara is skating due south at a speed of 4.6 m/s. Neil is in front of her. With respect to the ground, Neil is skating due west at a speed of 4.4 m/s. Find Neil's velocity (a) magnitude and (b) direction relative to due west, as seen by Barbara.

a) the magnitude is 6.37 m/s

b) the direction relative to due west, as seen by Barbara is 46.37° north of west

Explanation:

Given the data in the question;

Barbara is skating due south at a speed of 4.6 m/s

Neil is skating due west at a speed of 4.4 m/s

so

→ = 4.6 (-j^)

→ = 4.4 (-i^)

→ = → - →  = 4.4 (-i^) - 4.6 (-j^)

= -4.4i^ + 4.6j^

a) magnitude

magnitude |(→ )| = √( (-4.4)² + (4.6)²)

= √( 19.36 + 21.16)

= √40.52

= 6.37 m/s

Therefore, the magnitude is 6.37 m/s

b) direction relative to due west, as seen by Barbara.

using SOH CAH TOA

tan = opp / adj

so direction will be;

∅ = tan⁻¹( 4.6 / -4.4)

∅ = tan⁻¹( - 1.0454545 )

∅ = - 46.37°

Therefore, the direction relative to due west, as seen by Barbara is 46.37° north of west

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