Two blocks of masses m and 3m are placed on a frictionless, horizontal surface. a light spring is attached to the more massive block, and the blocks are pushed together with the spring between them (fig. p9.9). a cord initially holding the blocks together is burned; after that happens, the block of mass 3mmoves to the right with a speed of 2.00 m/s. (a) what is the velocity of the block of mass m? (b) find the system’s original elastic potential energy, taking m = 0.350 kg. (c) is the original energy in the spring or in the cord? (d) explain your answer to part (c). (e) is the momentum of the system conserved in the bursting-apart process? explain how that is possible considering (f) there are large forces acting and (g) there is no motion beforehand and plenty of motion afterward?

check my work and if incorrect provide detailed response.
a.) conservation of energy
3m*2+m*v=0
v=-6(m/s) (left)

b.) energy is conserved
k=((0.350kg)(6^2))/2+((3)(0.350kg)( 2^2))/2
k=8.4j
c.) the cord has stored no potential energy in the spring.
d.) there is no potential energy in the spring because the potential energy in the spring has transferred to kinetic energy of the two masses.

e/f/g.)yes. the two blocks of masses m and 3m are in one isolated system (attached to one another with a spring and pushed together) and the mass of the spring is less than both blocks and is only used for storing potential energy.

Explanation:

a ) Conservation of momentum is followed

m₁ v₁  = m₂ v₂

3m x 2 = m  v

v = 6 m/s

Total kinetic energy

= 1/2 x .35 x 6 ² + 1/2 x 1.05 x 2 ²

= 8.4 J

This energy must be stored as elastic energy in the spring which was released as kinetic energy on burning the cord.

Yes , the conservation of momentum will be followed  in the bursting apart process. Only internal forces have been involved in the process. Two equal and opposite internal forces are created by spring which creates motion and generates kinetic energy.

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

what type of charge does it have? negative