Official Homework Help & Discussions Thread. Page 3

Started by Gfx September 18th, 2013 1:17 PM
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donavannj

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Just find your newspaper website sources in whatever research database she has you using. 90% chance that if the research database is actually decent and up to date, they'll be there. Don't know if it'll meet the requirements, but it'll at least get one of your sources off of the internet.

I personally always had issues finding sources that weren't older than dirt on those darn databases, but I never had to use those after middle school.
whoops

Sydian

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15.2 Years
Does anyone use Open Office? I can't figure out how to put my uhhh what's it called...in MLA papers, you have to have "last name I" in the upper right corner of all your pages and I can't figure out how to do that because Open Office is a piece of ♥♥♥♥ and I'm starting to hate MacBooks lmao. Is it some kind of heading or what? I legit cannot figure out where it is.

I should probably ask this in Technology ehhhh idk.
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acatfrommars

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Seen February 5th, 2023
Posted January 9th, 2023
3,870 posts
9.6 Years
I need Chemistry help!

I need to convert my absorbances using a calibration curve to molarity.
Here:
http://i.imgur.com/b7zHbfa.jpg
Pic 1 of first graph (absorbance v time):
1 .176 2 .163 3 .153 4 .142 5 .132 6 .123 7 .114
Now I need to convert absorbance to molarity and be able to graph this:

Spoiler:

Honest

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Posted November 7th, 2022
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14.7 Years
I'm pretty sure I'm right, but I want to be sure, because I've always been a little hesitant when it comes to implicit differentiation (Calculus).

Question: Calculate (dy/dx) if 3x^4 + 3xy + 5y^4 = 10, and then find the equation of the tangent line to the graph of this equation at the point (1,1)

My work:
--Subtract 10 and differentiate each term so that:
-----3x^4 becomes 12x^3
-----2xy becomes 2x(dy/dx) + 2y via the product rule
-----5y^4 becomes 20y^3 * (dy/dx) via the chain rule

--Derivative looks like
-----12x^3 + 2x(dy/dx) + 2y + (20y^3)(dy/dx)

--Subtract the terms with (dy/dx), factor (dy/dx) out, and then divide to isolate, and you get (dy/dx) is equal to:
-----[12x^3 + 2y]/[-2x - 20y^3]

Then for the second part, you just find m by plugging in 1 for both x and y, and that is simple enough, I'm sure. Thanks for the check. :D

There's this other question that's stumping me though:

Evaluate as the limit approaches zero for [(x)*(sin 11x)]/(sin 7x)^2
he did it, not me.

Gulpin

poisonous

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Posted November 25th, 2016
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16.7 Years
Ooh, something I can actually help with!
Is the second term 3xy or 2xy? If it is 2xy your differentiation is correct, and if it is 3xy you should be safe with just replacing the two coefficient 2's in your derivative with 3's.
As for the limit, when you plug in x=0 you get indeterminant in the form of 0/0, so you use L'Hospitals rule to find the limit. Basically for L'Hospitals, if the limit is indeterminant (most common is probably 0/0) you can still solve it by differentiating the numerator and denominator separately, then taking the limit of the derivatives divided by each other. So for this particular problem, you differentiate xsin11x and then differentiate sin^2(7x), then plug in x=0 to determine the answer. However, when you plug in x=0 you still get 0/0, so you repeat L'Hospitals until you are able to plug in 0 and get an answer. You should get an answer with using L'Hospitals rule twice, and I got 11/49 when I worked it out.
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Honest

Hi!

Age 27
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Seen March 19th, 2023
Posted November 7th, 2022
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14.7 Years
Ooh, something I can actually help with!
Is the second term 3xy or 2xy? If it is 2xy your differentiation is correct, and if it is 3xy you should be safe with just replacing the two coefficient 2's in your derivative with 3's.
As for the limit, when you plug in x=0 you get indeterminant in the form of 0/0, so you use L'Hospitals rule to find the limit. Basically for L'Hospitals, if the limit is indeterminant (most common is probably 0/0) you can still solve it by differentiating the numerator and denominator separately, then taking the limit of the derivatives divided by each other. So for this particular problem, you differentiate xsin11x and then differentiate sin^2(7x), then plug in x=0 to determine the answer. However, when you plug in x=0 you still get 0/0, so you repeat L'Hospitals until you are able to plug in 0 and get an answer. You should get an answer with using L'Hospitals rule twice, and I got 11/49 when I worked it out.
Extremely late with this, but thank you so much <333 I'm guessing I use this for trig limits, eh?
he did it, not me.

Zorogami

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Helping others is always nice, so here i go:

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Feel free to send me a PM/VM to contact me directly!

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I just noticed this thread, figured I may be able to help out. Feel free to PM/VM if you think there's something I can help with.

Name: Tlachtli
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Seen June 29th, 2022
Posted May 17th, 2022
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10.5 Years
So, this is for college English. I just wanted to hear some opinions on the following questions:


Do celebrities have a responsibility to their audience/fans?
If yes, what do we mean by responsibility? If no, how do we account for their actions?
Is it a choice to be a role model?


•What is the role of a celebrity?

•Why do we have so many celebrities?

•Should celebrities even be role models?


•Do hip hop artists have a responsibility to their audience?
•What is that responsibility?

•Since hip hop artists have such an influence, should they rap about socially conscious or political issues?


•What is the purpose of Facebook and social media in general?
•Should employers have access to your Facebook?

•Should employers base their professional decision about you on your Facebook profile?


So yeah, really need the help, I'd appreciate it a whole ton!
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THE UNDERGROUND
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Posted November 28th, 2014
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This is for extra credit for my music class we have to tell what the sound is :/ I am at a loss guys.Attachment 71636
The two answers that people have already given in the class forums was.
1.Angry Lion
2.Band of Gorrilas
That's definitely not a lion. I can see the Gorilla aspect of it, There are also crickets and an owl at the end. So if it's an animal it's most certainly nocturnal which Gorillas are not. It sounds almost synthesised actually and it could very well be your teacher who recorded them self at home and slowed down the recording. Actually the quality of the sound doesn't match the quality of the ambience and it definitely sounds slowed down and reversed. The only thing that throws me is that there are a few voices in the background which I doubt a lot of teachers go to the effort of doing multiple takes and mixing it over some background noise to make it sounds like a group of animals.
Otherwise, you could narrow down the geographical location of the recording by trying to figure out what kind of owl that is at the end and look for aggressive creatures in that area.
If you can give more than one answer definitely ask if it was them.
Male
Seen January 31st, 2023
Posted July 30th, 2022
715 posts
9.9 Years
So, this is for college English. I just wanted to hear some opinions on the following questions:


Do celebrities have a responsibility to their audience/fans?
If yes, what do we mean by responsibility? If no, how do we account for their actions?
Is it a choice to be a role model?


•What is the role of a celebrity?

•Why do we have so many celebrities?

•Should celebrities even be role models?
Oh cool. I did this exact same thing last semester in college. I did pretty bad in the assignment, but let's see I can help.

A Celebrity's role to me, is whatever job they are doing in the entertainment industry. Actor, singer, rapper or whatever, it's their job nothing more. If they are seen as role models, then fine, but I don't think they have any obligation to actually act like a role model. Sure people look up to them, but in the end, they are really people just trying to do their job.

•Do hip hop artists have a responsibility to their audience?
•What is that responsibility?

•Since hip hop artists have such an influence, should they rap about socially conscious or political issues?
Hip-hop artists, like any other artists' responsibility is to create art/music that their fans enjoy. Yes, they have an incredibly large influence, and some of them do in fact, rap about political issues. I mean, I listen to a lot of this kind of music, and I'll admit, I even listen to the more hardcore/gangster rap. To be honest though, when Hip-hop artists make songs about political/social issues, they are usually not as big or popular as the usual stuff (yeah, I know, there are lots of exceptions). Kanye West and Lupe Fiasco are great examples of new school hip-hop artists that have some songs that are not about drugs, money, etc.

•What is the purpose of Facebook and social media in general?
•Should employers have access to your Facebook?

•Should employers base their professional decision about you on your Facebook profile?


So yeah, really need the help, I'd appreciate it a whole ton!
I'm not a big user of Facebook, but I guess people use it to stay connected with friends and family? I mean, I really only use it for that, and even then I barely log on :p

I don't think employers should have access to your Facebook or make decisions based on what you do on there. It's supposed to be a place where you have fun and post funny stuff to your friends, and if that so happens to be crude humour then so be it. If they aren't stating what company they are a part of and making them look bad, then I don't see the harm :/

finalrayne

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Age 31
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Northern Maine
Seen July 6th, 2015
Posted May 18th, 2015
259 posts
9.2 Years
That's definitely not a lion. I can see the Gorilla aspect of it, There are also crickets and an owl at the end. So if it's an animal it's most certainly nocturnal which Gorillas are not. It sounds almost synthesised actually and it could very well be your teacher who recorded them self at home and slowed down the recording. Actually the quality of the sound doesn't match the quality of the ambience and it definitely sounds slowed down and reversed. The only thing that throws me is that there are a few voices in the background which I doubt a lot of teachers go to the effort of doing multiple takes and mixing it over some background noise to make it sounds like a group of animals.
Otherwise, you could narrow down the geographical location of the recording by trying to figure out what kind of owl that is at the end and look for aggressive creatures in that area.
If you can give more than one answer definitely ask if it was them.
Wow really detailed answer lol I'll try and work on it from there thanks for the help figured the crickets out but never really looked into trying to find out what kind of owl it's is.

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Even though I've searched this stuff on the Internet pretty much but I'm still unable to decide so I decided to ask out here for help if it may be given to me

My question is, What topic would be best to take as a Physics project as a guy who's 17? I can't tell you about the grade cause I don't know your system of education...........


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Even though I've searched this stuff on the Internet pretty much but I'm still unable to decide so I decided to ask out here for help if it may be given to me

My question is, What topic would be best to take as a Physics project as a guy who's 17? I can't tell you about the grade cause I don't know your system of education...........
It really depends which course of physics you're taking (theoretical or experimental).
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Wow, okay, I realize I haven't been on the forums in forever and that most schools are out for the summer, but I thought I'd do this anyway. :P

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I may to able to assist in some things.

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So I found the limiting reagent. Not sure which number(s) though, if any that I've calculated, that you're alluding to.

Spoiler:


Sorry for crappy picture. If I had to guess, I'd say .062 mol of ethanol is relevant? Or perhaps going from ethanol to the limiting reagent, p-aminobenzoic acid (which I haven't shown)?
I know this is so late it won't be relevant, but in case anyone comes across something like this again (as you seem unsure in your answer?).

When working out limiting reagents for a reaction, the first thing you need to determine is the number of moles required for each reagent by making each side equal. In your example it is 1:1 (I'm assuming the reaction is correct and I have not bothered to check whether it is otherwise). All you need to do is work out, based on the mass provided as well as the volume, which of the two equates to less moles - that's your limiting reagent. In this case, it's the aminobenzoic acid that is your limiting reagent as you only have 0.0026 mol vs. 0.062 mol of ethanol.

Flushed

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Seen November 4th, 2017
Posted May 18th, 2017
2,301 posts
9.7 Years
I know this is so late it won't be relevant, but in case anyone comes across something like this again (as you seem unsure in your answer?).

When working out limiting reagents for a reaction, the first thing you need to determine is the number of moles required for each reagent by making each side equal. In your example it is 1:1 (I'm assuming the reaction is correct and I have not bothered to check whether it is otherwise). All you need to do is work out, based on the mass provided as well as the volume, which of the two equates to less moles - that's your limiting reagent. In this case, it's the aminobenzoic acid that is your limiting reagent as you only have 0.0026 mol vs. 0.062 mol of ethanol.
I was able to calculate the molar amounts, I was just wondering how molar equivalents work since I don't believe they are the same as moles, and some of the problems I had calculating number of equivalents from moles themselves (or mass, vol, etc.). Thanks for your response though, no matter how late.
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Ahh. In that case you need to look at the valence. E.g. 1 mol of Mg2+ has 2 moles electrons when you consider Mg -> Mg2+ + 2e-. So it's molar equivalent should be molar mass divided by number of electron moles. In this case 24/2 = 12 g. It is essentially the amount of substance that will provide or take 1 mole of hydrogen ions. So you could consider it by balancing this equation: Mg + 2H+ -> Mg2+ +H2. Which looks like this in a real world reaction: Mg + 2H2O -> Mg(OH)2 + H2.

To add to this. In your equation there appears to be only the transfer of one electron. Therefore I believe the molar mass of each of those molecules will also be the molar equivalent.

EDIT: I'd also like to add that I don't understand the point of this information. Where is it practically used? It may simply elude me since I'm not a chemist, but when you write out a chemical reaction you need to equal both sides which involves determining the balance of electrons anyway.
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11.3 Years
The teacher asked us to hand __ our homework but none of us had done it,
so we told her that she had forgot to assign it!

I thought the answer was ''in'' but apparently it is ''out''.Doesnt hand out mean give HW?


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Flushed

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Posted May 18th, 2017
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Ahh. In that case you need to look at the valence. E.g. 1 mol of Mg2+ has 2 moles electrons when you consider Mg -> Mg2+ + 2e-. So it's molar equivalent should be molar mass divided by number of electron moles. In this case 24/2 = 12 g. It is essentially the amount of substance that will provide or take 1 mole of hydrogen ions. So you could consider it by balancing this equation: Mg + 2H+ -> Mg2+ +H2. Which looks like this in a real world reaction: Mg + 2H2O -> Mg(OH)2 + H2.

To add to this. In your equation there appears to be only the transfer of one electron. Therefore I believe the molar mass of each of those molecules will also be the molar equivalent.

EDIT: I'd also like to add that I don't understand the point of this information. Where is it practically used? It may simply elude me since I'm not a chemist, but when you write out a chemical reaction you need to equal both sides which involves determining the balance of electrons anyway.
They'd give us molar eq. instead of mol or mass and we'd have to determine how much of a reagent to use, or something like that. And in our lab books, they wanted us to record amounts used in molar eq. as well.

The teacher asked us to hand __ our homework but none of us had done it,
so we told her that she had forgot to assign it!

I thought the answer was ''in'' but apparently it is ''out''.Doesnt hand out mean give HW?
Yeah, hand out definitely means give out homework haha.