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/science/ board


What do you think? Give us your opinion. Anonymous comments allowed.
User avatar #4579 - charizarddad (16 hours ago) [-]
1st question is basically how do solar panels work. Suppose I am generating 15 watts per solar panel at 3 panels, so 45 total(duh) and storing it into a battery 12v 35AH(specifically for solar applications) battery. How does that work? Do the solar panels just store the power into the battery when available? And at watt rate geddit ? 45 watts per second? Minute? Or? I also do not know a whole lot about electricity, i know terminology but not really how it works.

So then next question i guess is how does the battery work and how do appliances draw power? This is also where i get confused. Lets say in this situation i am using a computer and the psu is drawing 500 watts of power. Could i even hook the battery up to the psu? Would it run it, and for how long?

Lets say this is in perfect conditions for arguments sake, the psu is at 100% efficiency and the solar panels are drawing the max they can(45 watts.)
User avatar #4574 - sweetbutteryjesus (05/26/2015) [-]
How do I find an entropy value?
All the vids on youtube aren't explaining where I find them.
#4576 to #4574 - zanntaggerung (05/26/2015) [-]
You'll need to be a little more specific than that, but from what I remember of chemistry (and some quick googling) standard values of entropy S are usually given in tables along with values of standard enthalpy change ΔH to calculate the Gibb's free energy change ΔG using the formula ΔG=ΔH-TS (T is the temperature in Kelvins). This is done for each of the reactants and products, summed up for both sides and then do products minus reactants to find the overall ΔG.

Hope that was some help, entropy values aren't normally asked to be found unless you're given ΔG and ΔH so you could just solve the equation for S.
#4573 - minorian has deleted their comment [-]
#4567 - phanactssonjoe ONLINE (05/25/2015) [-]
i wish i had a atom smasher where i can take all of the molecules and atoms from a physical things, accelerate it, and shoot it at stuff. like it would seperate all the molecules and atoms of my old latop and shoot it at a car
#4565 - anonymous (05/25/2015) [-]
How do I solve this? It's says: "Solve the equation system."
User avatar #4578 to #4565 - rubiksdodecahedron (17 hours ago) [-]
Add the equations together to get 3x=9, the y's cancel out divide to get x=3, perform some simple substitution and basic math to get y=9.
#4575 to #4565 - zanntaggerung (05/26/2015) [-]
Excuse the poor quality paint drawing, but one way to do it is to show how y relates to x from one equation and then plug it into y for the other equation so you can solve it for x. Then you can plug the value of x into either equation (I plugged it into the first) and solve for y.
#4577 to #4575 - anonymous (05/26/2015) [-]
Yes, this is it. Thank you so much!
#4568 to #4565 - phanactssonjoe ONLINE (05/25/2015) [-]
x = 3 y = 9
#4570 to #4568 - anonymous (05/25/2015) [-]
I'm sorry, but that doesn't really help me. I need to know the procedure to how to solve the system, and not just the answers. Could you just simply show, how you came to answers, if that isn't too much to ask?
#4571 to #4570 - phanactssonjoe ONLINE (05/25/2015) [-]
idk how to show how i got the answer beside 3+ 9 is the only one that fits
#4572 to #4571 - anonymous (05/25/2015) [-]
I'm preparing for an exam, so I just need to know how to solve it, but thanks anyway.
#4566 to #4565 - anonymous (05/25/2015) [-]
It says**
User avatar #4560 - sweetbutteryjesus (05/24/2015) [-]
What the balls is reaction energy and reaction kinetics
#4561 to #4560 - paintskillz (05/25/2015) [-]
In short, it's what says whether a reaction will occur spontaneously or whether energy will be need to be added usually through heat for the reaction to occur.

pls enjoy my completely legible mouse-writing
User avatar #4562 to #4561 - sweetbutteryjesus (05/25/2015) [-]
Does this have to do with Gibb's Law?
User avatar #4563 to #4562 - paintskillz (05/25/2015) [-]
Yeah pretty much, however reaction kinetics takes things a step further and is used to determine the probable mechanism that a reaction undergoes in order for it to occur. That's something you shouldn't expect to see til advanced college level chemistry though
User avatar #4564 to #4563 - sweetbutteryjesus (05/25/2015) [-]
Okay, thanks.
I literally have no idea what I'm doing and finals are coming up.
#4559 - phanactssonjoe ONLINE (05/24/2015) [-]
why are fresh cherries so expensive? they have rainier cherries for $8 a pound and these other ones for $6. just wondering if theyre harder to grow or something
User avatar #4557 - PVTDickStryker ONLINE (05/23/2015) [-]
Why cant eye color be yellow or orange, and why cant hair be silver, green or blue?
User avatar #4558 to #4557 - subtard (05/23/2015) [-]
Wikipedia says people can have a light or dark blue epithelium at the back of the iris and varying amounts of yellow to brown melanin in the front. So blue eyes are from little melanin so all you see is the blue epithelium. Green is from blue epithelium and yellow melanin. Brown is when there's a lot of brown melanin. Even explains hazel/amber eyes and all that.
Hair color is from two types of melanin called eumelanin and pheomelanin which are brown/black and red. So varying levels of these create all hair colors.
So our bodies would need to use a totally different process to create different pigments and use them instead of melanin in order to have wonky hair/eye colors.
#4569 to #4558 - phanactssonjoe ONLINE (05/25/2015) [-]
i was always curious if humans had a stronger version of chlororphyll in our hair so we can get enough energy from sun. we would still food but just thought it would be cool
User avatar #4556 - fjtv (05/18/2015) [-]
I am doing an experiment which includes microwaving small amounts of iron oxide, is it dangerous to microwave it? I figure it might be, since iron oxide is made of, well, metal and oxygen. We all know metal shouldn't be put in a microwave, what about a metal oxide?
User avatar #4555 - xXMAQXx (05/17/2015) [-]
anyone want to help me with legendre equations?
User avatar #4554 - lulzforalpsplane (05/17/2015) [-]
https://youtube.com/devicesupport ....wut...
#4551 - phanactssonjoe has deleted their comment [-]
User avatar #4549 - sphincterface (05/15/2015) [-]
Alright guys so brace yourselves. This is something that has pissed me off immensely and I need to vent. So some person on Facebook posted this link to some stupid article involving Amish people. Supposedly, according to this one article, Amish children have lower rates of autism. Do you know what the article pointed to after this? You probably guessed it by now. It claims that it has a connection to the fact that the Amish don't vaccinate. The ignorance of some people is just fucking stupid.
User avatar #4553 to #4549 - subtard (05/16/2015) [-]
Just as conclusive as saying building barns prevents autism
#4550 to #4549 - smudgiemuffins ONLINE (05/15/2015) [-]
Honestly, I wouldn't say it's so much ignorance. I don't think this people are truly convinced that vaccines cause autism. I think it's rather that they don't care. The actual truth of the matter is completely unrelated to their goal. I suspect the real goal is socially driven. Humans just like to feel like they're fighting for something. They like conflict in their lives. And what better conflict than this? You've already got the archetypical scary green chemicals and mean scientists. You're not doing anything overtly illegal so no one can actually do anything to stop you. You're hurting people only indirectly so you don't have to take responsibility for the consequences.

At the end of the day, I don't know how to deal with people like that. Education is the best way to fight ignorance, but like I said, I don't think this is ignorance in the normal sense.
#4547 - phanactssonjoe ONLINE (05/14/2015) [-]
i love you
#4546 - gomugomuno (05/13/2015) [-]
who's the girl in the middle? black bikini dark hair.
User avatar #4552 to #4546 - glitternips (05/16/2015) [-]
#4548 to #4546 - phanactssonjoe ONLINE (05/14/2015) [-]
your mom
#4542 - trollofhalo (05/12/2015) [-]
Looking for help on 11th Grade Physics Homework
I'm supposed to find the mass of a car given the force used to push the car, the distance between points measured, and the time between points measured (See graph, where Part 2 is supposed to show acceleration.)
Can someone point me in the right direction?
#4545 to #4542 - smudgiemuffins ONLINE (05/13/2015) [-]
Remember your equations of motion and Newton's Laws. The applicable ones here being:

x=(1/2)(a)(t^2) + Vi

Given that you know the distance something went and the same it took to do it, you can determine what the acceleration of it had to be. Vi in this equation represents initial velocity and I assume this was done from the cars being at rest.

So now you've solved that equation for a. You've also got F. So grab F vs a. The slope of the graph will be m, mass, because the equation is in the form y=mx+b.
User avatar #4540 - nimba (05/11/2015) [-]
what even is space
User avatar #4543 to #4541 - nimba (05/12/2015) [-]
and it's different to the universe how?
#4534 - joethebeast has deleted their comment [-]
User avatar #4524 - ilovehue (05/07/2015) [-]
texture/viscosity/hardness wise, to what substance could we compare the earth's mantle?
User avatar #4535 to #4524 - alltimetens (05/11/2015) [-]
The mantle isn't just one substance. The mantle is composed of magma, sure, but there is also hard rock, and stuff that, in terms of texture/viscosity/hardness/etc, is somewhere in between magma and hard rock.

So it really all depends. We don't even know what the mantle looks like.
User avatar #4531 to #4524 - nimba (05/07/2015) [-]
User avatar #4526 to #4524 - skoldpaddacommala ONLINE (05/07/2015) [-]
I think it would be difficult if not a bit naive to compare 87% of the Earth's total volume to a single substance, but I guess you can say peridotite. You will however need to take into the varying high temperatures and pressures along the 2900km deep of mantle we have.

User avatar #4532 to #4526 - ilovehue (05/08/2015) [-]
okay that's it's composition... it compares to what... marshmellow? rubber? dough? peridotite seems hard. To what depth is it lava/acting like a fluid?
User avatar #4522 - goobyman ONLINE (05/06/2015) [-]
do fog machines just create aerosols of glycerin AKA heat it, vaproize it, let it cool down in the air= turns into fog?
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