Ask questions about maths, science, literature.... I've not started uni yet so I have a bunch of time to help! :)

Hey guys, we’re deleting but we hope we’ve helped you with things and if you want to follow/talk to us just click the little “meet your tutors” thing

Also when I say deleting, I mean we will not be answering anymore questions, but all the posts will be here. I think they are tagged so you can see if your question has already been asked.

Thank you!!

Chemistry

I am submitting this as tumblr wont let me post my question via the ask box .

Can this solution be used?

Commercial processors of potatoes remove the skin by using a 10-20% by mass solution of sodium hydroxide. The potatoes are soaked in the solution for a few minutes at 60-70 degrees celsius, after which the peel can be sprayed off using fresh water. You work in the laboratory at a large food processor and must analyze a batch of sodium hydroxide. you pipette 25.00mL of NaOH and find it has a mass of 25.75g. Then you titrate the basic solution against 1.986mol/L HCl, and find it requires 30.21mL of acid to reach an end point.

a) Inform your supervisor what the molar concentration of the sodium hydroxide is
b)The mass percent of NaOH must be a minimum of 10% for the solutuon to be used. Advise your supervisor whether or not the solution can be used to process more potatoes, and explain your reasoning.

Thank you!!

answer:

a)
(1.986 mol/L) x (30.21 mL) / (25.00 mL) = 2.400 mol/L NaOH

b) (25.00 mL) / (1000 mL/L) x ( 2.400 mol/L) x (39.9971 g/mol) =
2.399826 g NaOH in 25mL
( 2.399826 g NaOH) / (25.75g total weight) = 0.0931971262 = 9.3%
So it is not suitable for processing.

Anonymous Asked

QuestionBetween 1783 and 1853, the United States realized its Manifest Destiny to acquire all the land stretching from the Atlantic to the Pacific Oceans. How did this territorial expansion both preserve AND threaten the existence of the United States? Answer

hey so i’m going to answer this to the best of my ability because i havent taken apush in what seems like forever (actually last year)

anyways, here is a nice internet source:

http://everything2.com/index.pl?node_id=1263537

my words (less eloquent and just based on my knowledge and not on an internet source):

Yeah the preserve part is pretty easy because the US got more land and land=power so they were obviously much more powerful. They had a lot more resources so their economy was great. They could make more products and were more powerful in general.

As for threaten, with all these new territories an important question was brought up over slavery. While the north wanted no slavery, the south really wanted slavery (obvs). They eventually settled this with compromises and treaties and good things (good stuff to know). But this debate over slavery threatened to divide the country, thus threatened the very existence of a cohesive United States.

hope this helped!

jonnibegood Asked

QuestionDo you ever help with people's homework and they wind up just getting a C or something? Answer

In response to this I want to clear a few things up (this is going to sound majorly bitchy but I don’t even care because I just got my wisdom teeth out and I feel like crap):

Homework is not usually an assignment with a single problem. We help with single problems most of the time, so if one of you gets a C it’s usually not our fault, it’s yours.
However, it also should be recognized we are NOT perfect. Most of these questions are history and Chemistry for some bizarre reason, and it’s been two and a half years since I did APUSH and three since Chemistry and I’ve only ever taken regular chem because I wanted to do physics. So if I give you a wrong answer that negatively effects your grades, I’m sorry. If I give you a wrong answer, I’m sorry. I’m human and I make mistakes.
I should also address the fact that this blog is for homework help and not for homework answers. Sometimes I get a question straight up copied from a textbook or whatever assignment and I sit there and laugh like “Wow did you even try at all?????!” The answer is probably no, because I’m a teenager too and I know how you people work. I’ll usually help you out if I’m in a good mood but I’ll probably give you attitude. If you mention that you tried it and tell me where you got stuck, I’ll help you with no attitude.
I also like giving advice so if you guys have any questions and need advice on anything I CAN HELP.
I don’t appreciate questions like this. I’d rather give advice on school or anything in general, in fact, I’d rather get cavities filled without being numbed, than answer questions like this that imply that you think a tumblr run by two teenage girls is to blame if one of our followers relies solely on us for answers and we are the reason that one of our followers gets a less than perfect grade.

-Nicole

goobino:

I’ve seen quite a few posts from people stressing about their last year of high school/applying to college/generally struggling

Let it be known that I was only present for 60% of my senior year and started my college applications max 7 days before they were due

I got into college. You can too. Don’t stress.

Here are some cookies

Do not stress little one

Anonymous Asked

QuestionIn the Olympics, Skater # 107 (55kg) and skater # 108 (50 kg) are part of the American Speed Skating Relay team. Skater # 108 pushes her teammate with a forward force of 700N for the time of 1.12s. Assuming forward is positive, draw the FBD for both of them during the push separately. If they were both travelling at a constant velocity of 20 m/s before the push, what were their final velocities after the push( one for #107 and the other for #108) Answer

Since I don’t feel like drawing your homework for you….

What exactly are you having trouble on with this? As in are you struggling with drawing a diagram or finding the velocities?

For drawing diagrams, remember that as 108 pushes 107, 107 pushes back against 108.

Also momentum is p = m * v and impulse is F * ∆t = m * ∆v

nudge nudge

-N

pretty sure this is the way to go on this

also here is a good website on conservation of momentum which will help because this a problem

Anonymous Asked

QuestionAn average man requires about 2.00 mg of riboflavin (vitamin B12) per day. How many pounds of cheese would a man have to eat per day if this were his only source of riboflavin and if the cheese contained 5.5 μg of riboflavin per gram? (1 pound = 453.6 g). Answer

I’m not bothering with numbers because gosh darn do yer own werk guis

put 5.5 micro-g’s into mg
that is how many grams
convert to pounds

does this make sense

it’s just whatsitcalled… dimensional analysis? convert all to one thing to make e-z

-n

paintwithcolorsofthewind:

physics makes us all its bitches

basically, anyone reading this knows that tumblr + studying = difficult. we’re all procrastinators. so i thought i’d share my favorite ways to crack down, not suck, and make it through finals week. you’ll need
this or this. it’ll whip your ass into gear. you name a list of websites that distract you, set a timer, and bam. no more hour long study breaks. the best - or worst - part is, it can’t be undone by the application, by deleting the application, or by restarting the computer. you just gotta wait, and if you’re going to wait, you may as well study.
goals. when you sit down to study, write down everything you’re going to do. then do it. aimlessly staring at your books won’t do shit.
something to listen to. i suggest movie scores, song covers by the vitamin string quartet, or white noise.
a queue. if you’re really obsessed with keeping your blog up to date, set aside some time, fatten up your queue, and let your blog run itself for a few days.
breaks. during your breaks, dance, run around, work out, go for a walk, talk to your friends, call your mom. going back on the internet is an easy way to get out of the mood, so i wouldn’t suggest it.
tea and coffee - if not for the caffeine, then for the feeling of cozying up with your text books and feeling studious.
a place to study. it doesn’t matter if it’s in a coffee house, a library, or your kitchen table. as long as your bed’s not in sight and tempting you into a nap, you’re good.
that’s all i’ve got. i’d try to think of more, but that, my friends, would be procrastinating. off to study.

basically, anyone reading this knows that tumblr + studying = difficult. we’re all procrastinators. so i thought i’d share my favorite ways to crack down, not suck, and make it through finals week. you’ll need

this or this. it’ll whip your ass into gear. you name a list of websites that distract you, set a timer, and bam. no more hour long study breaks. the best - or worst - part is, it can’t be undone by the application, by deleting the application, or by restarting the computer. you just gotta wait, and if you’re going to wait, you may as well study.

goals. when you sit down to study, write down everything you’re going to do. then do it. aimlessly staring at your books won’t do shit.

something to listen to. i suggest movie scores, song covers by the vitamin string quartet, or white noise.

a queue. if you’re really obsessed with keeping your blog up to date, set aside some time, fatten up your queue, and let your blog run itself for a few days.

breaks. during your breaks, dance, run around, work out, go for a walk, talk to your friends, call your mom. going back on the internet is an easy way to get out of the mood, so i wouldn’t suggest it.

tea and coffee - if not for the caffeine, then for the feeling of cozying up with your text books and feeling studious.

a place to study. it doesn’t matter if it’s in a coffee house, a library, or your kitchen table. as long as your bed’s not in sight and tempting you into a nap, you’re good.

that’s all i’ve got. i’d try to think of more, but that, my friends, would be procrastinating. off to study.

(Source: fitify)

Hey! i just need help with the 2nd column and its not -9.8 or 9.8 for the first one so im very confused?

Did you try calculating the height of the cannonball at 0 and subtracting 9.8?
Or maybe insert 10 or something (it won’t accept negative values)

Hey! i just need help with the 2nd column and its not -9.8 or 9.8 for the first one so im very confused?

Did you try calculating the height of the cannonball at 0 and subtracting 9.8?

Or maybe insert 10 or something (it won’t accept negative values)