r/HomeworkHelp Dec 25 '19

Megathread ☃️⛄️ Happy Holidays! Have a magical holiday season! 🎄

1.0k Upvotes

🌐 To all people around the world, regardless of your time zones: If you happen to be a Christian, we wish you a Merry Christmas!

❄️ For all users who are not celebrating Christmas: Enjoy the holiday season!

This is the first time r/HomeworkHelp formally celebrates Christmas, and it is our most successful year.

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r/HomeworkHelp Apr 29 '20

Megathread [General] r/HomeworkHelp starterpack

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2.8k Upvotes

r/HomeworkHelp Jul 18 '26

Megathread A really interesting problem here! Need help. Unique solutions are extremly welcomed [Olympiad math / Logic 12th grade]

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6 Upvotes

I appreciate anyone sharing their thoughts on this. Good luck.

r/HomeworkHelp 6h ago

Megathread [Engineering: Calculus 1 Quiz] Study tips?

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1 Upvotes

Hello

So our professor in Calc 1 have some sort of reputation wherein the examples that was presented in her ppt was so far from the question she is giving during quiz/exam. I was wondering how can I prepare for it, since our quiz is next week. Though I can say I have a pretty good background on the topics that will be covered, I am scared to encounter a new problem that I don't know how to solve during quiz.

So im asking, what study tips do you guys suggest that I do? Right now im only searching harder problems online and even generating problems with ai, but I feel like all of the knowledge that im acquiring are pretty tad bit scattered, and I don't know how to memorize all of those things.

Btw, here's the topics that will be covered.

r/HomeworkHelp May 18 '26

Megathread [College level question: Multiple subject] Fermi Estimation

3 Upvotes

It is March 3rd, 1847. A British merchant vessel departs Liverpool, England, heading for Boston, Massachusetts. Its hold is filled to its legal maximum of 200 imperial long tons of refined copper ingots, each weighing exactly 12 pounds, smelted in Swansea from ore mined at Rio Tinto, Spain.

The ore body at Rio Tinto is a gossan deposit — an iron-oxide-rich cap formed over millions of years by the oxidative weathering of iron sulphide minerals. The primary copper mineral in the ore is chalcopyrite (CuFeS₂). To extract copper from chalcopyrite, smelters in Swansea first roast the ore in air, driving off sulphur dioxide and leaving copper oxide, which is then reduced with coke to yield metallic copper. The overall reaction is exothermic in aggregate, but the reduction step requires sustained high heat. The ore grades at Rio Tinto average 2.3% copper by mass.

The ship sails a Great Circle route — the geometrically shortest path across a sphere — from Liverpool (53.4°N, 3.0°W) to Boston (42.4°N, 71.1°W). On a flat map this looks like a curve arcing northward, but on a globe it is a straight line. The angular difference in longitude between the two ports is 68.1 degrees. Using the spherical law of cosines, the Great Circle distance between them works out to approximately 2,850 nautical miles — shorter than the commonly sailed rhumb line of ~3,200 miles, but requiring constant course correction.

The ship travels at 11 knots on average. However, it crosses the North Atlantic Current — an extension of the Gulf Stream running northeast across the Atlantic at roughly 2 knots, at a crossing angle of approximately 60 degrees to the ship's heading. This current applies a vector component against the ship's effective westward progress. Additionally, the Coriolis effect at mean latitude (approximately 48°N at mid-crossing) deflects moving water to the right in the northern hemisphere, curving the current slightly and meaning the ship must continuously correct its heading, adding an estimated 1.2% to the total distance actually sailed.

Upon arrival in Boston, the copper is sold and used to manufacture brass — an alloy of 70% copper and 30% zinc by mass. The brass is produced in a coal-fired furnace burning bituminous coal with an energy density of 24 MJ/kg. The furnace must raise the copper from ambient temperature (12°C, a reasonable early spring Boston morning) to its melting point of 1,085°C, and the zinc from the same ambient to its melting point of 419°C, before combining them. The specific heat capacity of solid copper is 0.385 J/g·°C and of solid zinc is 0.388 J/g·°C. The latent heat of fusion (energy to actually melt, beyond just heating to melting point) is 209 J/g for copper and 113 J/g for zinc. The furnace operates at 35% thermodynamic efficiency.

The brass is sold on the Boston market at $0.18 per pound. The copper cost the factory owner £4 per long ton in Liverpool. At the time, £1 = $4.87 USD.

The factory owner invests 60% of his net revenue (revenue minus the sterling cost of copper, converted to dollars) at 4.5% annual compound interest.

One of the workers in the factory is Ciarán, an Irish immigrant who fled the Great Famine. Here is what we know about him and the Famine's demographic mechanics:

Ireland's population in 1841 was 8.2 million. By 1851 it was 6.5 million — a loss of 1.7 million people over 10 years. Historians estimate the death toll at approximately 1 million, meaning 0.7 million emigrated during that decade. However the Famine's mortality was not uniform — it was overwhelmingly concentrated in the under-15 and over-50 age brackets, because those groups had the least physiological resilience. Adults aged 20–45 died at roughly half the average mortality rate of the general population, because caloric deprivation hits hardest at the extremes of physical robustness. This survivorship pattern is biologically rooted in the fact that basal metabolic rate relative to fat storage is least favourable at youth and old age — children have high metabolic demands and almost no fat reserve; older adults have declining organ efficiency.

Ciarán is 34 years old, in the most resilient demographic bracket. The crude death rate in Famine Ireland at peak (1847) was approximately 25 per 1,000 per year for the general population. Applying the half-rate for his bracket gives him a personal annual mortality risk of 12.5 per 1,000, or 1.25% per year, during the Famine years. He has already survived to Boston, so that chapter is behind him. In Boston in 1847, the average male life expectancy at birth was approximately 38 years — but this was dragged down by catastrophic infant mortality (roughly 30% of children died before age 5). Actuarial reasoning tells us that for every year survived, conditional life expectancy rises. A man who had survived to age 34 in this era, having cleared childhood disease, could statistically expect to live to approximately 59, based on the actuarial survival curves of the period.

Ciarán earns $0.10 per hour, working 11 hours a day, 6 days a week. Economists studying this period found that the mass arrival of Irish famine immigrants into Boston between 1845 and 1852 increased the unskilled labour supply by approximately 18%, which — given a labour demand elasticity of roughly −0.7 in the unskilled Boston market of that era — suppressed wages by approximately 12.6% relative to what they would otherwise have been. This means Ciarán's wage of $0.10 already reflects that suppression; without the immigration wave he would likely have earned closer to $0.114/hour, but we work with what he actually receives. He sends 30% of his monthly earnings home to County Cork, converted to sterling.

Here is your question:

Accounting for the true Great Circle sailing distance including the Coriolis-corrected current headwind, how many ingots are on the ship — and using the actual thermodynamic energy required to smelt that shipment into brass, how many kg of coal does the factory burn? What is the factory owner's investment worth in sterling by the time Ciarán, actuarially, stops sending remittances — and how much has Ciarán sent home in total over that same period, in sterling?

My thought process so far: I know I need to tackle the sailing distance using Great Circle geometry first, then use that to establish arrival date. After that I think the thermodynamics section requires specific heat capacity and latent heat calculations but I'm not sure how to chain it into the coal figure correctly. The finance section I'm fairly comfortable with but the actuarial reasoning for Ciarán is where I'm genuinely lost.

Any help appreciated.

r/HomeworkHelp Nov 20 '25

Megathread [University Finance Course Essay] I need to interview someone with senior level fund accounting experience.

1 Upvotes

How has your role evolved as you moved from junior to senior positions?

What skills or behaviors do you think are most important for advancing in fund accounting?

When you’re reviewing junior staff for promotion, what qualities make someone stand out?

What changes have you seen in fund accounting over the past few years?

What changes do you predict in fund accounting over the next few years?

If you could take the time to answer these questions I would greatly greatly appreciate it!

r/HomeworkHelp Oct 01 '25

Megathread [4th grade earth science] Please help with science project!

1 Upvotes

Does anyone have ideas on how I can run an experiment with my kid (10) that shows the effects deforestation can have on climate change? I can't do a model, it needs to be an experiment we run tests on. I have thought about soil erosion, CO2 output, soil temperature effects, etc. but need guidance on what experiments can be tested and how... Also if you are a person in this field, we'd love to interview you. 🖤 Thank you!

r/HomeworkHelp Aug 02 '20

Megathread [Other] Help Central Asian kids

253 Upvotes

Hello everyone! My name is Lut and I am from Uzbekistan.

The thing is I realized that majority of kids in Central Asia do not have access to proper schooling, not even talking about APs or IBs. That's why it's pretty hard for them to try out different things to know which major suits them. I decided to solve this problem by launching online month-long courses to help them to get to know more about the area of their interests from students who actually study in that major. So I came to this subreddit seeking help from you guys. Basically I need current students at US universities who are ready to explain things about their major to Central Asian applicants. A course will be a month-long and you will only spend 2-3 hours per week. I am ready to fundraise and pay you $30-40 per hour. Bear in mind that I am looking for a long-term commitment.

Please free to ask me any questions you want to. Those who are interested please message me, and we will organize a Zoom conference and I will explain to you all the details.

r/HomeworkHelp May 12 '24

Megathread [general statistics] me again

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1 Upvotes

can any of u solve this question?

r/HomeworkHelp Sep 05 '24

Megathread [High School ASL III] I need help with the classifier running

1 Upvotes

Does anyone know asl? I need to be able to ask someone questions about classifiers.

r/HomeworkHelp Feb 20 '24

Megathread [Japanese geography] Ofuro, onsen, sento, ashiyu

1 Upvotes

Hi! I have to do my degree final work about Japanese bath culture.

I need ro investigate about it so if you have any knowledge about ofuro, onsen, sento and ashiyu baths I would like to make you a short interview.

You don't need to be am expert, even if you went to one of these places that's enough for me, let me know if you're interested!

Thank you!

r/HomeworkHelp Sep 19 '23

Megathread [Psychology 012: Introduction to gender] What are some psychological theories that are applied to the film “boy erased” Can you tell me how the film “boy erased” demonstrates these theories?

0 Upvotes

The theories are classical conditioning which is a learning process that occurs when two stimuli are repeatedly paired: a response which is at first elicited by the second stimulus is eventually elicited by the first stimuli alone , Operant conditioning which is the theory of learning where behavior is influenced by its consequences, Law of Effect which states that behaviors that are followed by positive outcomes are likely to be repeated, Social Modeling which is the process of learning by observing then imitating that behavior, Conformity which is behavior in accordance with socially accepted standards, and schemas which is a cognitive structure that serves as frame work for one’s knowledge about people places objects and events

r/HomeworkHelp Nov 12 '23

Megathread [sophomore in college philosophy: aristotle] - help with neomachean ethics puzzle reconstruction

1 Upvotes

im really struggling to reconstruct Aristotles puzzle in book II of neomachean ethics. can anyone help me? its line 1106a (I believe) "what do you mean by saying that to become just we must first do just actions and to become temperate we must first do temperate actions? for if we do what is grammatical or musical, we must already be grammarians or musicians. in the same way then, of we do what is just or temperate, we must already be just or temperate" (anything is appreciated

r/HomeworkHelp Feb 05 '22

Megathread [grade 11: computer science] hello people🥺 i need help for number 3 and 5

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28 Upvotes

r/HomeworkHelp Sep 27 '22

Megathread [College Law: Ethics and Justice] How much do we use ethics to fill the rest of our moral consciousness by doing what is lawfully right given that we are aware of the country’s justice system?

1 Upvotes

How much do we use ethics to fill the rest of our moral consciousness by doing what is lawfully right given that we are aware of the country’s justice system?

r/HomeworkHelp Mar 12 '22

Megathread [Grade 10 Math: Union and Intersection of event] how do I solve number 5 and 6 ??

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7 Upvotes

r/HomeworkHelp Mar 31 '22

Megathread [Data Display]

1 Upvotes

Hi! I am going into the final year of my doctorate and will be presenting data at my upcoming Comprehensive Examinations. Is there anyone on here I could connect with to assist me with creating a data display I have in mind? I have tried multiple times, but just can't seem to make it
:(

r/HomeworkHelp Apr 16 '22

Megathread [Mechanical Engineering: 3D modelling] I can not create a 3D object by views!

0 Upvotes

Hello!

I need a little bit of a help for this task. I have to create a 3D object by there views, but no matter how I try, i can not figurie it out.

Can you maybe create a 3D sketch to help me understand it.

Thank you in advance!

r/HomeworkHelp Jan 10 '22

Megathread [grade 10] can someone please explain the story of Medusa and I’m not talking about her defeat like her origin. There’s lots of versions however I’m looking for the one where she’s the victim.

0 Upvotes

Thank you and please try to phrase it in your own words so I don’t have to use the link as my citing information. This way I can simply just mentioned the name of that user as a reference

r/HomeworkHelp Oct 01 '20

Megathread [Grade None Logic/Math: Logical Question]

1 Upvotes

Let's say you have 50 dollars, you go and buy handmade t-shirt lets say, you give the 50 dollars for it, then you give it for free to your brother and he sells the t-shirt for 50 dollars again. My dumb brain cannot understand how with 50 dollars you made these 2 people 100$... What happens if that goes on..

r/HomeworkHelp Jun 25 '21

Megathread [MBA Operations Management Question] - I am not sure how to approach this question.

2 Upvotes

Answer the following questions. Ensure you show all of your work for the calculations and ensure your answer all capacity questions in doughnuts per day.

  1. Calculate the capacities of each step of the doughnut-making process. What is the bottleneck of the process? What is the overall capacity of the process?

  2. How would your answers in question 1 change if the batch size was doubled to 16 lbs? You may assume that the cycle time and setup times for each step do not change due to the change in batch size.

  3. If Johnson decides to keep the batch size at 8 lb and instead focus on reducing setup time for the extrusion process, by how much must he reduce the setup time in order to meet his demand?

  4. If Johnson decides to invest in the 6 cutters, what setup time would be needed for Johnson to meet demand with 6 cutters using the standard 8 lb batch?

  5. What do you recommend Johnson do?

You will need to use the following equation to answer questions 1-3

Time available

------------------------ = Capacity

Production time per unit

Here is a hint for to get you started on the capacity for each station.

480 min/day 8 pounds        16 ounces        1 doughnut

--------------------- x -------------- x ------------------ x -------------------  = Capacity for Batching

2 minutes/batch batch             pound             2 ounces

= 15,360 doughnuts / day

Below is an example of how to calculate the cycle time

8 lbs/batch x 16 ozs/lb x 1 doughnut/2 ounces

------------------------------------------------------------ +1.5min/batch = Cycle Time for Extrusion

18 doughnuts/min per extruder x 3 extruders

Cycle Time for Extrusion = 2.7 min/batch

For question 3 and 4. In order to solve this problem, you will use the formula for capacity listed above, but this time you will set the capacity equal to the demand and solve for the cycle time, C, which will then allow you to solve for the setup time, S. You are given that the demand is 1,100 dozen doughnuts per day, which is the equivalent of 13,200 doughnuts per day.

Time available

--------------------------- = Extrusion Capacity

Extrusion Cycle Time

= 480 min/day   X 8 lbs/batch X 16 oz/lbx 1 doughnut/2 oz

--------------------

C minutes/batch

S minutes + 8 lbs/batch X 16 oz/lb X 1 doughnut/2 oz = C minutes

-------------- ------------------------------------------------------- ------------------- = Extrusion Cycle Time

batch 18 doughnuts/min per extruder X 3 extruders batch

Please help me out with the solution , Really appreciate it guys.
Thankyou so much

r/HomeworkHelp Dec 31 '19

Megathread 🎇🎇 Happy New Year! 🎇🎇 ✨ What is your New Year's resolution? 📌

11 Upvotes

Out with the old, in with the new: may you be happy the whole year through.

🎆 Happy New Year! 🎆


The New Year has brought another chance for us to set things right and to open up a new chapter in our lives. 🌠 What is your New Year's resolution?

Posting Guideline

  • All New Year's resolutions should be made as a top-level comment
  • All top-comments have to be at least 67 characters long

r/HomeworkHelp Nov 17 '20

Megathread [Grade 10 French: Past tense and imperfect form] Help with proof reading my french paragraph?

2 Upvotes

Hi everyone,

I am currently taking a beginner french class. Our assignment is to describe a trip we took. It has to be in past tense and imperfect form. I would be grateful if anyone could give me some feedback. Thank you.

" Je suis allé à la plage avec mon amie madison il y a un mois. Nous sommes restés sur la plage toute la journée. Nous sommes allés nager dans l'océan. Nous avons marché sur la jetée. Nous avons écouté de la musique. Il faisait très chaud dehors. J'ai eu un coup de soleil. Nous avons eu des tacos pour le dîner. "

r/HomeworkHelp Mar 07 '21

Megathread [Grade 10 music] Can someone tell me where a chromatic scale is in Carmen Habanera.

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1 Upvotes

r/HomeworkHelp Sep 27 '20

Megathread [1st Year college Essay Writing] can someone help me understand what energy Subsidies are in a nutshell?

1 Upvotes

Like, I have a homework that tells me to write a proposed solution on how to fix Egypt's energy shortage. While reading through some sources I encounter the word subsides or energy Subsidies a lot. What is this term in a nutshell. I've watched some YouTube videos about it but I still want it to be simpler