Suppose the first stage of a two-stage rocket has a total massof 12,000 kg, of which 9,000 kg is fuel.
the total mass of the second stage is 1,000 kg, of which 700kg is fuel.
assume that the relative speed vexof ejected material is constant, and ignore the effect ofgravity.
a) suppose the entire fuel supply carried by the two-stagerocket is utilized in a single-stage rocket with the same totalmass of 13,000 kg. in terms of vex , what isthe speed of the rocket, starting from rest, when its fuel isexhausted?
b) for the two-stage rocket, what is the speed when the fuelof the first stage is exhausted if the first stage carries thesecond stage with it to this point?
this speed (from part b) then becomes the initial speed of thesecond stage. at this point, the second stage separates from thefirst stage.
c) what is the final speed of the second stage?
d) what value of vex is required to givethe second stage of the rocket a speed of 7.00 km/s?

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