/sci/ - Science & Math

[Anonymous No.4889208]

How do I become good at solving physics olympiad (IPhO) problems?

[Anonymous No.4889216]

do you have a physics club / circle near by?

if not you're screwed.

[Anonymous No.4889213]

>inb4 HS fagget
most problems are pretty tough

[Anonymous No.4889217]

enjoy your ban

[EK !EKFnQG0UBo No.4889222]

>>4889217
>your

[Anonymous No.4889230]

>>4889216
??
what makes this important?

[Anonymous No.4889242]

>>4889222
>implying that was incorrect.
tsk, tsk,

[EK !EKFnQG0UBo No.4889248]

>>4889242
lel

[i am batman No.4889249]

>>4889222
you need to walk the walk of shame, son!

[EK !EKFnQG0UBo No.4889255]

>>4889249
no i dont
lern-2-meme, newfag
https://archive.installgentoo.net/sci/?task=search2&ghost=&search_text=enjoy+you%27re+ban&am
p;search_subject=&search_username=&search_tripcode=&search_filename=&search_datefrom
=&search_dateto=&search_op=all&search_del=dontcare&search_int=dontcare&search_or
d=new&search_res=post

[Anonymous No.4889254]

>>4889248
>Jokes on them, I was only pretending to be retarded.

[EK !EKFnQG0UBo No.4889258]

>>4889254
do you honestly think i'd genuinly fuck up, when i have images such as the above, and also this?

[i am batman No.4889259]

>>4889258
are you 5? go back to /b/ lame fag

[Anonymous No.4889262]

>>4889249
<span class="math">\mathbf{\mathcal{ENJOY~YOU'RE~BAN}}[/spoiler]

[Anonymous No.4889312]

please back to topic!

[Anonymous No.4889322]

>>4889312
No. You are underage. Fuck off.

[Anonymous No.4889366]

>>4889312
>>4889208

A ballistic missile is launched from the north pole, the target is at the latitude \Phi (>0, if northern hemisphere, <0 otherwise). At which angle (with respect to the horizon) the missile needs to be launched in order to have minimal launch velocity of the missile?

[Anonymous No.4889381]

>>4889366
solution?

[Anonymous No.4889393]

>>4889381
you're fiucked

[Anonymous No.4889402]

Dude what?? they have Quantum mechanics in high school now?
XI Quantum mechanics
1. ~p = ¯h~
k (|~p| = h/λ), E = ¯hω = hν.
2. Interference: as in wave optics.
3. Uncertainty (as a math. theorem):
∆p∆x ≥
h¯
2
, ∆E∆t ≥
h¯
2
, ∆ω∆t ≥
1
2
.
For qualitative estimates by non-smooth shapes, h
serves beer (∆p∆x ≈ h etc).
4. Spectra: hν = En−Em; width of spectral lines
is related to lifetime: Γτ ≈ h¯.
5. Oscillator’s (eg. molecule) en. levels (with
eigenfrequency ν0): En = (n + 1
2
)hν0. For many
eigenfrequencies: E =
P
i
hniνi
.
6. Tunnelling eect: barrier Γ with width l is easily
penetrable, if Γτ ≈ h¯, where τ = l/
p
Γ/m.
7. Bohr’s model: En ∝ −1/n
2
. In a (classically
calculated) circular orbit, there is an integer number of wavelengths λ = h/mv.
8.Compton eect— if photon is scaered from an
electron, photon’s ∆λ = λC(1 − cos θ).
9. Photoeect: A + mv
2
/2 = hν (A - work of
exit for electrons). I-U-graph: photocurrent starts
at the counter-voltage U = −(hν − A)/e, saturates for large forward voltages.
10. Stefan-Boltzmann: P = σT
4
.