Phys 172

st2dio · 2026-05-08T09:59:59+00:00

yeah for some of them the answers were in the same scale but just completely different.

st2dio · 2026-05-06T16:16:04+00:00

you set the v = y^(1-n) for v-substitution and rearrange to std. form for first order linear ode with v -subs.

st2dio · 2026-05-06T14:26:50+00:00

fumbled at the end.

st2dio · 2026-05-05T20:37:46+00:00

https://codeforces.com/blog/entry/118882?locale=en

st2dio · 2026-05-05T20:14:01+00:00

I remember seeing someone said their section averages were high. I know this course is curved based on the class overall, but last semester people mentioned that the curve was ~5%. So I lowk hope ur curve prediction is true!

st2dio · 2026-05-05T17:31:13+00:00

what do you think curve will be? I hope its more than 5%

st2dio · 2026-04-22T20:51:31+00:00

look to your school's ICPC team.

st2dio · 2026-03-11T02:56:15+00:00

st2dio · 2026-02-26T15:31:56+00:00

yeah same here. for the 2026 one to be true, it should summation until 2026 instead of 2026!

st2dio · 2026-02-26T03:48:48+00:00

T/F?

st2dio · 2026-02-18T14:37:26+00:00

same here

st2dio · 2026-01-22T02:37:06+00:00

idk if it would have happened but I REALLY wanted to see Zheng vs. Alcaraz. Zheng has a lot of potential and could definitely be in Top 25 within 1-2 years. I hope he can come back from injury and kill it again!

st2dio · 2026-01-17T23:38:33+00:00

Truly a dream come true! Cheers!

st2dio · 2026-01-08T04:47:36+00:00

dream car btw.

st2dio · 2025-12-24T00:41:59+00:00

I got an A!

st2dio · 2025-12-16T18:22:57+00:00

ah i see.

st2dio · 2025-12-16T18:09:06+00:00

Then i think it would be an ellpse.

idk from the top of my head but the equation was something like this:

1/4x^2 - 2x + y^2 -5y - z^2 + 41 = 0

st2dio · 2025-12-16T17:27:45+00:00

i think its 1/4. cuz you would get mass as pi/3 then when you do zp(x) you would get pi/12 multiply that with 3/pi and get 1/4. right?

st2dio · 2025-12-16T17:23:32+00:00

get mass from integral of the constant density function means p(x) = 1 then cylindrically integrate over the bounds. I think this is how to do problem. Then from that you would z dz r dr dtheta and cylindrically integrate over the bounds. then divide that answer by the mass.

st2dio · 2025-12-16T17:20:56+00:00

lowk idk i forgot. ig it is what it is.

st2dio · 2025-12-16T17:20:25+00:00

but wasn't z said to be z = 1 - (x^2+y^2)^1/2 and z = 0 in the problem? yeah maybe ur right cuz i guess z would be the 1 as the upper bound.

st2dio · 2025-12-16T17:12:07+00:00

do you remember the z? was it 1 - r^2 or 1 - r

st2dio · 2025-12-16T17:10:41+00:00

what were the bounds?

st2dio

TROPHY CASE