Askier starts from rest at the top of a hill. the skier coasts down the hill and up a

second hill, as the drawing illustrates. the crest of the second hill is circular, with a

radius of r=36 m. neglect friction and air resistance. what must be the height h of

the rst hill so that the skier just loses contact with the snow at the crest of the second

hill? (hint: here you may want to use both energy conservation and force methods as

part of your solution. in any case you should identify what forces would be directed

radially inwards when the skier is at the crest of the second hill and remember that

these are the forces that would generate the skier's centripetal acceleration. of these

forces, which would vanish if contact between the skier and the hill was lost? this

force might then be set to zero in the solution.)

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

the total distance traveled by the car is

30km + 49km = 79 km .