## Fermi Questions C

bernard
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### Fermi Questions C

"One of the ways that I believe people express their appreciation to the rest of humanity is to make something wonderful and put it out there."

jkang
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### Re: Fermi Questions C

Best event (had a blast proctoring this at MIT last year)!
UT Austin '19
Liberal Arts and Science Academy '15

Ashernoel
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### Re: Fermi Questions C

Best event (had a blast proctoring this at MIT last year)!
Hey bro! I took the test and placed like 20th haha, but after reading the nats training packet your test included a lot of multistep ones with large exponente and looked very official with appropriate space for each question. I didn't do well, but it was a fun experience

I hope you find more invites to make tests for as they'd be super lucky to have you
NT '19
Harvard '23

whythelongface
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### Re: Fermi Questions C

Interested in Fermi, but since I have no idea about the magnitudes of anything, it seems really impossibly hard to me.
WEST WINDSOR-PLAINSBORO HIGH SCHOOL SOUTH '18
EMORY UNIVERSITY '22
SONT 2017 5th Place Medalist [Microbe Mission]

"One little Sciolyer left all alone,
He went out and hanged himself and then there were none."

Congratulations to WW-P South for winning 14th place at Nationals!

NeilMehta
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### Re: Fermi Questions C

Interested in Fermi, but since I have no idea about the magnitudes of anything, it seems really impossibly hard to me.
To start, try looking at something like http://www.fermiquestions.com/play to get a feel for the event, and just try to memorize some common values like the diameter of the sun, earth, moon, etc, and make sure to have surface area and volume of a sphere down to compute stuff (70% of earth's surface is water, etc)
i can't feel my arms wtf i think i'm turning into a lamp

voted least likely to sleep 2018, most likely to sleep in class 2017+2018, biggest procrastinator 2018

whythelongface
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### Re: Fermi Questions C

Interested in Fermi, but since I have no idea about the magnitudes of anything, it seems really impossibly hard to me.
To start, try looking at something like http://www.fermiquestions.com/play to get a feel for the event, and just try to memorize some common values like the diameter of the sun, earth, moon, etc, and make sure to have surface area and volume of a sphere down to compute stuff (70% of earth's surface is water, etc)
Yeah, I have looked at it, and I'm surprisingly okay at it. I mean, I am really inconsistent (either I'm off by 1-2 degrees of magnitude, or I'm off by 7+), so I guess trying out for Fermi wouldn't be the worst idea. Although, without the slider, even GUESSING an answer completely will be much harder...

Anyway, how would you tackle some of the computational ones? I managed to get $7^{56}$ within one degree of the actual answer, but I tried again for $4^{20}$ and was off by about 6 degrees...
WEST WINDSOR-PLAINSBORO HIGH SCHOOL SOUTH '18
EMORY UNIVERSITY '22
SONT 2017 5th Place Medalist [Microbe Mission]

"One little Sciolyer left all alone,
He went out and hanged himself and then there were none."

Congratulations to WW-P South for winning 14th place at Nationals!

NeilMehta
Wiki Moderator
Posts: 318
Joined: August 27th, 2016, 5:27 am
Division: C
State: NY

### Re: Fermi Questions C

Interested in Fermi, but since I have no idea about the magnitudes of anything, it seems really impossibly hard to me.
To start, try looking at something like http://www.fermiquestions.com/play to get a feel for the event, and just try to memorize some common values like the diameter of the sun, earth, moon, etc, and make sure to have surface area and volume of a sphere down to compute stuff (70% of earth's surface is water, etc)
Yeah, I have looked at it, and I'm surprisingly okay at it. I mean, I am really inconsistent (either I'm off by 1-2 degrees of magnitude, or I'm off by 7+), so I guess trying out for Fermi wouldn't be the worst idea. Although, without the slider, even GUESSING an answer completely will be much harder...

Anyway, how would you tackle some of the computational ones? I managed to get $7^{56}$ within one degree of the actual answer, but I tried again for $4^{20}$ and was off by about 6 degrees...
Try estimating log base 4 of 10 - it's just a bit more than 1.5 (4^1.5=8), so try about 1.7
Then, rewrite the problem as 10^(20/1.7)
That becomes 10^11.7 which can be rounded to 10^12
i can't feel my arms wtf i think i'm turning into a lamp

voted least likely to sleep 2018, most likely to sleep in class 2017+2018, biggest procrastinator 2018

whythelongface
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### Re: Fermi Questions C

Pure genius...
WEST WINDSOR-PLAINSBORO HIGH SCHOOL SOUTH '18
EMORY UNIVERSITY '22
SONT 2017 5th Place Medalist [Microbe Mission]

"One little Sciolyer left all alone,
He went out and hanged himself and then there were none."

Congratulations to WW-P South for winning 14th place at Nationals!

PM2017
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State: CA

### Re: Fermi Questions C

Hello SciOly Community

This will be my first year doing Fermi Questions, and I have no clue how I'm meant to study/practice for it.
I went to the link provided earlier in this thread (http://www.fermiquestions.com/play), however, it seems that the website needs to be renewed.
Do you guys have any idea what I should use to study?

West High '19
UC Berkeley '23

Go Bears!

NeilMehta
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Joined: August 27th, 2016, 5:27 am
Division: C
State: NY

### Re: Fermi Questions C

Hello SciOly Community

This will be my first year doing Fermi Questions, and I have no clue how I'm meant to study/practice for it.
I went to the link provided earlier in this thread (http://www.fermiquestions.com/play), however, it seems that the website needs to be renewed.
Do you guys have any idea what I should use to study?

Hi!
I'd highly reccomend looking through the Fermi Quesrions Marathon here on the forums, or try one of these:
http://mathforum.org/workshops/sum96/in ... eila3.html
https://www.eduweb.vic.gov.au/edulibrar ... rimary.pdf

In addition, maybe try just setting up large exponents and prepare for pure math questions (2^50, 3^20, etc)
i can't feel my arms wtf i think i'm turning into a lamp

voted least likely to sleep 2018, most likely to sleep in class 2017+2018, biggest procrastinator 2018