/sci/ - Science & Math

>he sunk it in water
>but doesn't know how to measure density
this is what happens when sperg fucks only care about math and dont know anything else

>>6999869
Find the volume by finding how much space the ball takes up in three dimensions.

>>6999869
Mass spectrometry.

>>6999869
fill cup with water to brim to where it's overflowing
put ball in cup
measure volume of water that comes out.

or measure the diameter and <span class="math"> \frac{1}{3} \pi D^3 [/spoiler]

>>6999875
neutron activation and gamma spectroscopy

>>6999876
or you could just put it in a fucking measuring cup

4/3 pi r^3
R= 0.5 d
that is if you had calipers lying about
if all you have is string and a ruler, measure circumference and divide by 2pi to get r

>>6999876
Hey, how do you get the Wikipedia style equation text on here?

>>6999876
it's 1/6 not 1/3

>>6999892
By reading the sticky

>>6999869
>Fill cup to brim.
>Place cup on scales.
>Record weight.
>Remove cup (so as not to spill on scales).
>Dunk ball in.
>Reweigh cup.
>Difference in weights up cup is weight of water taking up same volume as ball.
>Calculate volume from density of water.

>>6999892
pic related

>>6999876
>>6999907
OP just use a fucking measuring cup

>>6999869
Do you even Archimedes?

>>6999914
We do not know if OP has a measuring cup.
We do know that OP has scales.

>>6999869
>get measuring cup
>place ball in measuring cup
>fill with water
>find how much water was lost

>>6999921
everyone has a measuring cup

>>6999923
I do not have a measuring cup.

>>6999902
you got me.
I was weirded out when the 4's just canceled out in my head.
>>6999892
It's called LaTeX.
use math or eqn tags
[math.] code here [/math]
remove the period
LaTeX Tutorial in the sticky:
https://sites.google.com/site/scienceandmathguide/

>>6999922
no
>put x amount water in measuring cup
>put ball in
>record new water level
>subtract this from OG level
wala

I calced the formula of 4/3πr^3 for volume

Comes out to 17157 with the 16mm radius

What is my ml volume?
Measuring cup is not accurate enough
No lab access

>>6999930
>I calced the formula of 4/3πr^3 for volume
this is a shit way of measuring volume, especially since it's wrong by a factor of 2. just do the water method.

>>6999930
17.157ml

>>6999930
http://lmgtfy.com/?q=17157+mm%5E3+in+mL

>>6999930
17.16 cc. dont measure solid density in ml

>>6999927
>find 2 liter bottle
>put ball in bottle and fill with water
>drink the contents minus the ball
>find out how much you need to drink to reach a full 2 liters

>>6999930
why do you want to know so much about this ball OP

>>6999936
>>6999940
breddy fuggin dense

>>6999944
>Coat ball in bleach.
>Lick ball clean.
>Measure how much of your tongue is left.

>>6999947
Why don't you?

Specific gravity is 2.22 volume over mass

What could it be?

>>6999951
That would just find surface area.

>>6999955
Lick it and tell us if acid/basic
My bet's on basic

>>6999955
it's specific gravity is the same as its density

>>6999955
Try dissolving it in something that isn't water.

Do you have nail polish remover?

>>6999956
Vol/Area = r/3 genius

>>6999949
2220kg/m^3 is not particuarly dense for a metal
http://www.engineeringtoolbox.com/metal-alloys-densities-d_50.html

>>6999955
Google suggests vitreous silica? A type of glass

>>6999979
lel im retarded and forgot to divide the mass, just took it as 17 g/cc

It's a clay cannonball, they used them to shoot at those clay soldiers in China.

>tfw /sci/ can't into history.

>>6999869
Is it metallic?
Does it shine with it's sea of electrons?

>>6999993
Density's way too high for clay.

>>6999869
>tfw op discovers chunk of dark matter that will solve energy crisis

might have come from a

recliner chair

burned in above mentioned fire pit

>>6999917
kek

This.

>>6999955
Looks like a roasted kidney stone.
Probably from a deer

>>7000147
You could be right

>>7000147
This guy is either a redneck or a genius

>>7000197
>redneck or a genius
>or

fuck you

>>6999875

watch out, you might cause a resonance cascade.

>>6999955

it's osmium.

2.21 Merlinoite colorless 4.5 Vitreous (Glassy)
2.21 Lishizhenite brown, yellow 3.5 Vitreous (Glassy)
2.21 Chalcanthite green 2.5 Vitreous (Glassy)
2.21 Chessexite white - Silky
2.21 Goosecreekite colorless 4.5 Vitreous (Glassy)
2.21 Grumantite white 4-5 Vitreous - Silky
2.21 Karchevskyite ! white 2 Vitreous - Pearly
2.21 Nahcolite colorless 2.5 Vitreous - Resinous
2.21 Olshanskyite colorless 4 Vitreous (Glassy)
2.21 Paranatrolite colorless 5-5.5 Vitreous - Greasy
2.21 Pringleite colorless 3-4 Vitreous (Glassy)
2.21 Rapidcreekite colorless 2 Vitreous (Glassy)
2.21 Ruitenbergite colorless 3-4 Vitreous (Glassy)
2.21 Tuzlaite colorless 2-3 Silky - Pearly
2.22 Whewellite brownish 2.5-3 Vitreous - Pearly
2.22 Calciocopiapite yellow, brownish 2.5-3 Pearly
2.22 Hydrophilite ? white - Vitreous - Greasy
2.22 Lanmuchangite ! yellow, light 3-3.5 Vitreous (Glassy)
2.22 Lannonite white 2 Earthy (Dull)
2.22 Mcauslanite colorless 3.5 Vitreous - Silky
2.22 Cyanochroite blue, green 2-2.5 Vitreous (Glassy)
2.23 Alumohydrocalcite white, chalky 2.5 Vitreous (Glassy)
2.23 Gordonite colorless 3.5 Vitreous - Pearly
2.23 Nekoite white, pearl - Pearly
2.23 Portlandite colorless 2.5-3 Pearly
2.23 Rhomboclase bluish 2 Vitreous - Pearly
2.23 Yugawaralite colorless 4.5 Vitreous (Glassy)

>>7000230
dont forget OP hasnt done any error analysis and probably only took each measurement once and his reported numbers probably have minimum 10% error. OP, with your crude methods you'll never know for certain what it is

>>7000230
> assuming his measurements are <1% accurate

>>7000238

Error: Comment too long (Undefined/2000).

>>6999869
Put water in measuring cup, put ball in, take measurement, subtract. There is volume

Take ball and take it's weight.

find its mass to volume for density

google it

>>7000147
would it really be perfectly spherical though?

>>6999935
Uh, no it's not wrong by a factor of 2?
Can you explain how that equation gets it wrong?

>>6999869
Op just ask >>7000000

>>6999993
Oh shit! OP, a time traveler from ancient china is trying to assassinate you!

>>6999869
How big is it? Take pictures of it next to coins or something for size reference.

>>7000326
it could have been polished or something, it does look like animal kidney stones (Google)
I didn't know people collected these, kind of weird

Yfw op doesn't realize hes refined dark matter and our ticket to the stars.

>>6999869
it's just an antique marble, probably clay.

>>7000680
>refined dark matter
>>6999869
>Scrapes (by knife) to a white powder.

nope, dark matter it is not

>>7000738
Are we sure that cooking dark matter doesn't make it interact with normal matter?

>>7000447
my bad i read it wrong. someone presented some equation based on diameter that was wrong and I linked the wrong equation

Super renowned metallurgist with 47 years of experience here.

OP, that's a ball bearing, they're generally made of iron or steel. They're used in things that rotate, like a wheel, to make it rotate smoothly.

http://lmgtfy.com/?q=ball+bearing

>>7002574
>nonmagnetic

Can't tell how big it is... if it's heavier than you'd expect from a piece of steel, it might be lead, or a lead rich alloy.
>white
>malleable enough to scrape with a knife

>>7002574
Looking at the density it seemed closer to an aluminium alloy to me

>>7002612
malleable, really heavy
>core from an Xray machine

I don't know if someone already mentioned this, but the best way to go about researching this would be:
you should cover the sphere with some sort of lubricant and easily slide it into your anal cavity.
That's it.

>>6999892
>LaTeX
>"Wikipedia style equation text"

>>6999869
ball lightning fossil maybe

>>7002962
How do I use the meme-arrows?

>>6999955
>>6999930
>>6999869
>Filename
Are you trying to trick us?

its a micro meteorite

Dip it in some bathroom chemical

>>6999955
you can't know, because it might be empty on the inside.

This is just a taw. Have you had a childhood ?

>>7003037
>meme-arrows
do people outside 4chan really call them that ?

>>6999927
>wala
>>>/ck/

>>7003156
Well, we insisted on making fun of the one idiot that did first by continuing to call them that, so they probably do a this point.
Everything they do is our fault for doing it ironically.