/r/HomeworkHelp

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Need help with homework? We're here for you! The purpose of this subreddit is to help you learn (not complete your last-minute homework), and our rules are designed to reinforce this.

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❗️ READ THE RULES BEFORE POSTING

>> Get help now! <<

Welcome to /r/HomeworkHelp!

We are one of the most unique subreddits on Reddit, one of the few subreddits that continually self-improve itself to make communications between a contributor and an asker as effective as possible.

Our rules are designed to help you get to the right answer, enforced by your fellow Redditors.

Please google before posting your question

 

 

✅ Posts should look like this:

The title should be of the form [<Level/Syllabus><Discipline>and/or<Topic>] <Question>? For example:

  • [Grade 8 Math: Quadratic Equations] How to factorise ax2 + bx + c?
  • [University Chemistry: Titration] What is my qs?
  • [AS Level English: Essay Writing] Should all adverts be factual?

Include instructor prompts. What does your instructor want you to accomplish?

Still acceptable…, but preferably not:

  • [High School Math] <Question>?

Be specific about your grade

  • [Grade 8 Math] Help me!

What is your qs?

When your question has been answered, please edit the post's flair to "✓ Answered".

 

❌ Not Allowed:

  1. Copied questions without context or explanation. You must show some work or thought.

  2. "Do this for me" posts such as posting of quizzes or lists of questions.

  3. Posts tagged "urgent," "ASAP," "important," "due in an hour," etc.

  4. Requests for help with cheating, plagiarism, or other violations of academic integrity; violations of copyright or terms of use; or other illegal or unethical activities.

  5. Being a jerk. Jerks get banned.

  6. Offers or solicitations of payment in any form. Those who spam us will be banned. No warnings.

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  8. Surveys. Take them to /r/samplesize.

Keep in mind that we do not and will not have any sort of vetting procedure for responders. Accept answers at your own risk.

 

For citation questions, check the Purdue Online Writing Lab

 

Using LaTeX:

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Custom superscript and subscripts:

Here's the syntax:

*_sub_* makes sub

*`sup`* and ^(sup) both make sup

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If you have trouble with spacing, add some blank spaces with &nbsp;

2300H becomes 2300   H

Spoiler Tags:

[text](#s) = text

>!text!< = text

 

Useful Symbols:

θ­ μ ← ↑ → ↓ ↔ ↨ ω α ∴

Basic Math: ≠ ≈ ≥ ≤ ± ∓ × ⋅ ÷ √ ‰

Geometry: ∠ ∟° ⊥ ∥ ≅ Δ π

Algebra: ≡ ≜ := ≈ ∝ ∞ ≪ ≫ ⌊x⌋ ⌈x⌉ ∘ ∆ ∑ ∏ γ φ π

Set Theory: ∩ ∪ ⊆ ⊂⊄ ⊇ ⊃ ⊅ ⊖ ∈ ∉ Ø

Calculus & analysis: ε ∫ ∮ ∯ ∰ ∇ δ ∞

 

Available Commands

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For more commands, please see User Moderation

 

Some possibly helpful links:

Khan Academy

AskRose

The Organic Chemistry Tutor

freesciencelessons

GCSE Science

Doc's Brown Website

RapidTables

Divisor Finder

Pastebin / JSFIDDLE.net/ IDEOne

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/r/HomeworkHelp

629,041 Subscribers

1

[8th grade Geometry] None of my friends and I could solve this question on the board, help would be appreciated!

0 Comments
2024/04/07
14:28 UTC

0

[high school level physics question)

Could anyone help do and explain this physics question for me please?

1 Comment
2024/04/07
13:36 UTC

4

[Geometry 1] Tangents and chords

5 Comments
2024/04/07
13:31 UTC

0

[11th chemistry] I need help on this

0 Comments
2024/04/07
13:21 UTC

1

[11th grade math] what is this question asking of me?

I can’t for the life of me figure out what this is asking me to do

1 Comment
2024/04/07
13:00 UTC

1

[1st year uni; Physics; Electrodynamics] If a metal disk enters a uniform magnetic field, created by two Helmholtz coils powered in such a way to keep a constant current, does the voltage (delivered by some form of battery) need to increase decrease or stay the same to keep this steady current?

I thought that, when entering, the disk creates a magnetic field in the opposite direction of the existing field (Lenz), which then results in a change of flux through the coils in such a way to create an induction current in the same direction as the current that was already flowing through the coils --> the battery can decrease its voltage.

But I am really not sure so I would like some help

1 Comment
2024/04/07
12:39 UTC

1

[Grade 12 Modern History: create your own source analysis]

I have a history assignment and I NEED sources from the 1992 summer olympics in Barcelona regarding any comment or Indication or reference to it being Czechoslovakias last year competing as a whole if anyone has any source it would be an amazing help even a website that helps finding legit sources I’m just really struggling finding any at this point.

1 Comment
2024/04/07
11:48 UTC

0

[Research / Statistics] How to interpret this table?

The data is supposed to show that one group had a higher than normal 30 day prevent. hosp., but I am not too sure how to interpret this data from the table?

No idea what Reduced Form or IV estimate is, and unsure what mean dep variable and SD dep variable values mean here?

1 Comment
2024/04/07
11:43 UTC

2

[University maths: calculus] How do I solve this?

4 Comments
2024/04/07
11:40 UTC

1

[University: script writing] Dreams affecting reality story. Stuck at a plot point.

So i asked here for ideas before too and I've somewhat come up with a story but I'm stuck on two paths i could take and need to know which works better and how.

Basically the MC has met a girl that he fell in love with and eventually saved her life by changing her fate but it ends up badly because:

A. she turns out to be a bad person (picture johan from monster, that kinda trope) and he has to kill her to correct his mistake. what i need is what does she do that's so bad that she deserves to die for it or to prevent more of it.

B. she ends up killing him in the near future. I wanna go with this because it brings my story to a full circle but i cant come up with a way to connect her to the MC in a way where she would kill him. need help with that.

Which of these is better and how do i fill the gaps. please help T.T

1 Comment
2024/04/07
10:48 UTC

1

[Grade 12 Chemistry: Convective resistance calculation]

Hello,

Considering the following figure, it is given that H = 3 m, and we know that the convective resistance is equal to Rconv1 = 1/h1A1, where A1 is the surface. Nevertheless, it is said that the Rconv1 here would be Rconv1 = 1/h1H which I fail to understand. Is the formula right or there's a mistake? It is not given to us any kind of geommetry specifications except H.

Thank you!

https://preview.redd.it/q1uzyq2x31tc1.png?width=953&format=png&auto=webp&s=48a0a844582b838d5097d48f0ceb024df5f4a8fc

1 Comment
2024/04/07
09:48 UTC

5

[Chemistry orbits: Easy] don’t get the same result as book

The question is: “find the one(s) with 5 unpaired electrons” (so we’re working with orbits in chemistry), I found Co^2+ but my book says that Fe^3+ is also a solution. Is this right? My professor is well known for not giving the right solution so wanted to check.

Sorry if it doesn’t make sense my english is not that good

8 Comments
2024/04/07
09:35 UTC

1

[AP Microeconomics: short run]

1 Comment
2024/04/07
09:30 UTC

3

[Honors PreCalculus: Summation Conjecture] Decoding Problem

Hello Everyone!

My friend recently sent me a problem but it’s blurry, so I can't fully tell what it says. I got most of it but it isn’t right. Does anyone know what the conjecture is? I tried brute forcing it through Desmos to no avail, but I know he missed the second summation symbol on the right side. Thank you!

OG Problem

My Desmos Attempt

2 Comments
2024/04/07
07:11 UTC

1

[AP Microeconomics: effective minimum wage]

I don't get what this question is saying...

Is the effective minimum wage a wage floor (similar to a price floor)?

Is it like the opposite of when demand is inelastic for a product, increase in price will decrease the quantity demanded but increase the TR...

https://preview.redd.it/34k54qomwzsc1.png?width=741&format=png&auto=webp&s=f2e0a968b746ba8615e45ca4084b70dfbcf01c46

1 Comment
2024/04/07
05:44 UTC

0

[Highschool Question] What does impact velocity mean?

Lets say there is a bystander on the road watching a collision. truck 1 is traveling east at 60 km/h and another truck from behind hits the first truck with an Impact velocity of 65km/h. In this scenario would the bystander observe the impact speed to be 65km/h or 125 km/h? What about the people in truck 1, would they see the impact velocity of only 5 km/h or 65km/h still?

2 Comments
2024/04/07
05:26 UTC

1

[Year 3 Life Science: Plant bioassay] Choosing the appropriate stats to use for my experiment

Which stats to choose for my experiment.

Hi, I'm currently running an experiment with plant and 3 different fertilisers. Briefly, I am using 1 type of plant, and for each fertiliser, they are exposed to different dosages of fertiliser (0g, 10g, 20g, 30g, 40g N). My aim is to,

(i) Determine for each fertiliser, which dosage is the best for the plant.

(ii) Between the 3 fertiliser, is there any difference.

For this, I am assuming that my independent variable would be dosage of fertiliser and types of fertiliser. My dependent variables collected are: plant weight, leaf number, height, surface area, colour.

Was thinking if I should do one-way anova for (i) before using the best to do (ii). Or conduct a two-way anova? Would appreciate any advice as this is my first time approaching this type of experiment. Thank you in advanced!

1 Comment
2024/04/07
02:59 UTC

1

[Intro to Sociology: Reflective Paper]

Any advice on what to add or how to organize my paper?

I currently need to write a ten page paper for sociology on substance abuse, and I’m not sure how to structure it. I started by explaining what substance abuse is and how society affects it. I talked about social control and stigmas on the issue.

3 Comments
2024/04/07
02:29 UTC

1

[Policy Report] Entirely Bullet Point?

Hello, I am tasked to write out a policy report covering an issue in which I am to propose possible policy actions. Is it okay to format the report entirely with bullet points?

I have made policy reports for other courses in which I was able to only use bullet points, however, the length needed was only 2-3 pages. This specific assignment is requiring me to write 6 pages single-spaced. I have tried emailing the prof, but he is not responding.

3 Comments
2024/04/07
02:29 UTC

0

[College Freshman History]

How can I edit this map to put dots and names on it?

6 Comments
2024/04/07
00:50 UTC

2

[calc 12] is this fully factored? Should I rewrite it in anyway.

5 Comments
2024/04/06
23:26 UTC

1

[High school Math: Geometry] Can you find the possible range of X?

11 Comments
2024/04/06
22:14 UTC

1

[University scientific paper] How to find date of submission, acceptance and publishment of a scientific article

For my university assignment I have to find this date of this article: https://www.nature.com/articles/d41586-024-00232-3 .
I have looked in Pubmed, Web of science and journal citations reports and have only found the article in Pubmed. But i have no clue how to find this data, any ideas?

Thanks in advance!

1 Comment
2024/04/06
22:13 UTC

0

[College PTS] does anyone know how to prove this is a good pdf?

5 Comments
2024/04/06
21:19 UTC

0

[Grade 11 Physics/Math: Collisions and Vectors] Help with understanding how force is distributed amongst a rack of pool balls

I am writing this topic for my IB math HL IA (namely optimal angle/ point to hit the initial pool ball at), however, the topic I chose is closely related to physics. I tried googling this, and while there is information on collisions between two pool balls, there is little on the behavior of multiple, in the specific pool triangle arrangement.

Suppose you have a standard triangle rack of billiard balls under ideal conditions (all balls are touching and identical, no friction, and all elastic collisions, ect). Suppose force F is applied to the top of the triangle (just like in most normal matches of pool), at some angle.

How exactly is the force distributed then amongst the balls? If the force were to be perpendicular, I assume that the force is evenly distributed amongst each point of contact, so each ball has equal velocity in the second layer of 2 balls. However, how does this generalize for all angles?

It seems that no matter how the first ball is hit, the points of contact between the first ball and second ball remain the same (at 30 degrees relative to the perpendicular angle), and thus the direction of the force remains at 30 degrees. I vaguely know the assumption that when a ball hit another, the ball goes perpendicular to the point of contact of the hit, explaining why the balls in the last line always go at 30 degrees.

But from this, I feel as though this slightly contradicts the asymmetrical force distribution seen. If the direction of the force is always converted to 30 degrees regardless of the initial direction, then why is the force distributed at differing points accounting for direction (as in, suppose an angled shot has a y-component to it as well. Under this assumption, wouldn't the y-component get converted along with the x-component into a completely unrelated angle upon the second layer of collision? How come there being a y-component seems to "favor" the force distributions?)

Another related question is how exactly is force "distributed"? I would greatly appreciate resources or an explanation as to how energy is distributed between balls touching multiple points. For example, the first ball is touching the two balls on the row below, and when the force is applied, it would then "bounce" back. But in what proportion? Would it be 1/3 of F as it has two points of contact with the other balls? How would this work during energy transfer in the third layer, where the middle ball has two points of contact, while the side balls only have 1? I notice that the y-components of the middle ball cancel out into a lesser y-component. How would conservation of momentum work in this case?

In online simulators, it seems the white cue ball "bounces off" the stationary ball when they hit. However, when the force is propagated through the triangle, you technically have balls with force at the front, applying force to the stationary balls at the back of the triangle just like the white ball. However, this does not result in a "bouncing" pattern to happen, rather the balls in the triangle all go the same direction. Is there any explanation as to why this doesn't occur when balls are touching?

I would appreciate if you guys can provide some calculations or formulas as to proving these types of problems, or possibly essays/articles/papers specifically on this topic

Sorry if this is a basic question, I only learned of one dimensional collisions in physics a while ago, while I am doing this for a (honestly poorly chosen) topic for a math unit on vectors.

1 Comment
2024/04/06
20:07 UTC

0

[college interior design] need help with manual drafting drawing

i can show you my instruction paper, it has measurements of what is needed in the drawing but I have a hard time visualizing and starting it out and my anxiety is going up and giving me a hard time concentrating

2 Comments
2024/04/06
19:54 UTC

1

[11th grade algebra 2]

0 Comments
2024/04/06
19:29 UTC

1

[Maths] Implicit differentiation

Can I implicitly differentiate lny=sin^3 (3x+4) to find dy/dx??

I know you could just use e to get rid of the natural log but I am wondering.

5 Comments
2024/04/06
19:06 UTC

1

[Chemistry] badly needed help for thesis

I badly need help with my research paper. Could you please advise me on the formulations or methods for preparing Carbopol 940 with a 3% ethanolic extract of okra (e.g., 1081 ml), while using 1% Carbopol? Also, could you explain how to adjust the Carbopol to achieve the desired concentration? By the way, I'm not a pharmacy student, so this is new to me.

3 Comments
2024/04/06
18:58 UTC

1

[1st year of university: topology] check if this limit is the limit of given sequence in given metric space

X=R² and d is metric of jungle river and (3 -1/n , 2) --> (3,2) (n-->oo)

I used the formula |x1-y1| +|x2|+|y2| since (3-1/n)≠3. but it gave me

1/n +4 --> 4 ≠0, so it seems like (3,2) is not a limit of (3-1/n, 2) but I think I've made a mistake of some kind here.

if I have used the second formula |x2-y2| then it would give me 0 but I think it would be wrong since (3-1/n)≠3, but I could be mistaken since 3-1/n in infinity ""would be"" 3

2 Comments
2024/04/06
18:38 UTC

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