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Old 09-18-2020, 05:43 PM   #1
Sun Tzu
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Extra Credit Quiz #1 Reveal

1. The vast majority of the mass of the visible universe is composed of...

a. electrons
b. protons
c. neutrons
d. baryons


2. Which element has the most stable nucleus?

a. Nitrogen
b. Gold
c. Iron
d. Bismuth


3. The gravitational force your head exerts on the earth is roughly...(a Newton is roughly .225 lbf)

a. 50N
b. 5N
c. .5N
d. .0005N

4. When standing upright, is time faster for your feet or your head?

a. feet
b. head
c. neither
d. impossible to say


5. If someone loses weight through diet and exercise, reducing body fat, how did that mass leave their body?

a. rectum
b. pores
c. lungs
d. none of the above



Participants:

bsball
onuzq
treep
EADGBE
Eric
borninabin
wahoopride
eyebooger
tokyo!!
pwnsall
viggorous
mark k
nails
Uglydelicious
xander biscuits
Carl_Spackler
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Old 09-18-2020, 05:47 PM   #2
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Re: Extra Credit Quiz #1 Reveal

bsball ddabb
onuzq caaac
treep bacad
EADGBE bacbc
Eric bbdab
borninabin cdbad
wahoopride bccbb
eyebooger dcdbc
tokyo!! babbb
pwnsall dbdac
viggorous cbdad
mark k dbabd
nails caccd
Uglydelicious acaba
xander biscuits cbadc
Carl_Spackler ccabc
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Old 09-18-2020, 05:54 PM   #3
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Re: Extra Credit Quiz #1 Reveal

1. The vast majority of the mass of the visible universe is composed of...

a. electrons
b. protons
c. neutrons
d. baryons



I screwed up here. The answer I was looking for was baryons, since they include neutrons and protons and therefore make up > 99.99% of ordinary matter, but to make that the only correct answer, I needed to not have protons as an option or be more specific about "vast majority" since the composition of ordinary matter throughout the universe is thought to reflect the composition of our sun which is around 85% protons. But even doing that would have been very unfeynman of me since knowing that matter is overwhelmingly hydrogen is more important than knowing what the word baryon means. I marked b and d as correct here.

Last edited by Sun Tzu; 09-18-2020 at 06:00 PM.
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Old 09-18-2020, 05:56 PM   #4
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Re: Extra Credit Quiz #1 Reveal

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Old 09-18-2020, 05:57 PM   #5
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Re: Extra Credit Quiz #1 Reveal

aw dang! i missed this!

i'll just play along at home.

for number 4 if your head or feet move faster through time it obviously depends if you standing on top of the earth or on the bottom
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Old 09-18-2020, 05:58 PM   #6
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Re: Extra Credit Quiz #1 Reveal

actually i think it would depend if you were standing on one of the polls or the equator
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Old 09-18-2020, 05:59 PM   #7
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Re: Extra Credit Quiz #1 Reveal

2. Which element has the most stable nucleus?

a. Nitrogen
b. Gold
c. Iron
d. Bismuth


This is just trivia and therefore probably not a great question. Iron has the densest and most stable nucleus of any element but I don't know how anyone would guess that other than being familiar with binding energy per nucleon charts.
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Old 09-18-2020, 06:03 PM   #8
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Re: Extra Credit Quiz #1 Reveal

how about this, does building a large skyscraper slow the rotation of the earth?
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Old 09-18-2020, 06:03 PM   #9
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Re: Extra Credit Quiz #1 Reveal

3. The gravitational force your head exerts on the earth is roughly...(a Newton is roughly .225 lbf)

a. 50N

b. 5N
c. .5N
d. .0005N


This question was looking for Newton's 3rd law (if A exerts force F on B, then B exerts force -F on A). The weight of your head is the same as the force that your head exerts on the earth.
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Old 09-18-2020, 06:05 PM   #10
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Re: Extra Credit Quiz #1 Reveal

Quote:
Originally Posted by filthyvermin View Post
how about this, does building a large skyscraper slow the rotation of the earth?
in principle, yes

directing mass outwards (upwards) increases the rotational inertia
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Old 09-18-2020, 06:06 PM   #11
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Re: Extra Credit Quiz #1 Reveal

4. When standing upright, is time faster for your feet or your head?

a. feet
b. head
c. neither
d. impossible to say


This question was looking for knowledge that gravity slows time.
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Old 09-18-2020, 06:13 PM   #12
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Re: Extra Credit Quiz #1 Reveal

5. If someone loses weight through diet and exercise, reducing body fat, how did that mass leave their body?

a. rectum
b. pores
c. lungs
d. none of the above


This one is counterintuitive and pretty interesting. It's similar to the question of where the mass of a tree (or any plant) comes from.

We get our energy and nutrients from the plants and animals we consume. That metabolism depends on breathing in O2 and breathing out CO2. When we lose weight, it's from the carbon exiting our bodies through our lungs.
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Old 09-18-2020, 06:18 PM   #13
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Re: Extra Credit Quiz #1 Reveal

Winners:

4 pts:
eyebooger
Carl_Spackler

3 pts:
bsball
EADGBE
wahoopride
mark k
Uglydelicious

2 pts:
onuzq
tokyo!!
pwnsall
xander

1 pt
treep
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Old 09-18-2020, 06:27 PM   #14
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Re: Extra Credit Quiz #1 Reveal

As I was doing number 4 I knew I was going to convince myself backwards after thinking about interstellar and I did. Lost the flip on iron gold.

The last one I may have vaguely known from an eli5 on reddit asking why we weight less in the morning than at night.
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Old 09-18-2020, 06:28 PM   #15
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Re: Extra Credit Quiz #1 Reveal

Gg thanks for running
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Old 09-18-2020, 06:31 PM   #16
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Re: Extra Credit Quiz #1 Reveal

Wouldnt most of the force your head exerts on the earth being you holding it upright with muscles etc, not gravitational force.
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Old 09-18-2020, 06:35 PM   #17
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Re: Extra Credit Quiz #1 Reveal

Quote:
Originally Posted by pwnsall View Post
Wouldnt most of the force your head exerts on the earth being you holding it upright with muscles etc, not gravitational force.
when you're standing up, the only force your head is exerting on the earth is gravitational

your feet are exerting the weight of your whole body on the floor via electromagnetism
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Old 09-18-2020, 06:39 PM   #18
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Re: Extra Credit Quiz #1 Reveal

My head is exerting force on my neck!

Recount!
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Old 09-18-2020, 06:42 PM   #19
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Re: Extra Credit Quiz #1 Reveal

Quote:
Originally Posted by pwnsall View Post
My head is exerting force on my neck!

Recount!
it is
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Old 09-18-2020, 06:45 PM   #20
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Re: Extra Credit Quiz #1 Reveal

Thanks for running. Happy with my 3, i think lungs threw me for a loop thinking breathing doesn't push anything out through the lungs, it just uses them.

And yes, I think most of my issues in life can be explained by the force my head exerts on my neck
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Old 09-18-2020, 07:00 PM   #21
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Re: Extra Credit Quiz #1 Reveal

Iím pleased, thanks for running!
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Old 09-18-2020, 07:02 PM   #22
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Re: Extra Credit Quiz #1 Reveal

Kinda shocked I hit three with that :3
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Old 09-18-2020, 07:04 PM   #23
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Re: Extra Credit Quiz #1 Reveal

Damn, pissed that I missed #1. Just had a brain fart.

Feynman, love that guy
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Old 09-18-2020, 07:06 PM   #24
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Re: Extra Credit Quiz #1 Reveal

Quote:
Originally Posted by Uglydelicious View Post
Kinda shocked I hit three with that :3
your submission was "all cops are bad and *******s", right?
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Old 09-18-2020, 07:20 PM   #25
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Re: Extra Credit Quiz #1 Reveal

On behalf of the zeroes, thanks for not putting up our score. I'm a little disappointed that I predicted it -- hoped I might stumble into at least one correct answer.

Thanks for running, ST, and congrats to the winnars.
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