Hello Brilliant!

Brilliant's second Problem Writing Party was an even bigger success than the first. Thanks to all the contributions from Worranat, Brian, Anish, Arjen, Rajdeep, Nihar, Hobart, Jason, Pranshu, Margaret, Akshay, Lee, Jonas, Zeeshan, W Rose, Vignesh, Yash, John Michael, Sahil, Denton, Ishan, Sachin, and the countless others of you who helped!

This week, we were able to create a record-setting **six** new quizzes. Here are the quizzes that you all helped create:

New Brilliant Challenge Quizzes

Rational Functions: Level 2-3

Volume: Level 1

Volume: Level 2

Conservation of Energy: Level 2

Complexity / Runtime Analysis: Level 3

Limits of Functions: Level 1-2

As always, we're going to continue showing off the hard work these members of the community put in over the last week, so Brilliant will featuring these quizzes in **topic listings and social media**. Now that those announcements have been made, we're moving on to our *third* Problem Writing Party!

## How it Works

The party starts right now (February 15th, 2016) and will last for the next two weeks. Throughout the two weeks, we will be focusing on writing awesome problems for the topics listed in quizzes that need your help on the *publish page*.

To join, submit as many problems as you want to these listed topics. At the end of the party, Brilliant staff will be picking the best 5-10 problems for each topic. These problems will then be immortalized and formed into a challenge quiz. If we pick your problem, then you can brag to your friends because it will be displayed on Brilliant forever!

Use this note to

Ask questions about the party or brainstorming ideas from Brilliant staff.

Share links to great relevant problems.

Bounce your ideas off each other to help formulate the best problem you can.

*To be selected, problems you submit should be fun and challenging to a student in levels 1-3 for the given topic.*

## This Party's Topic Listing

The topics of problem submission for this party can be found by navigating over to the Brilliant publish page and checking under the **quizzes that need your help section**. Just click the contribute button next to the topic you want make a submission to.

Happy writing and continue to party on!

## Comments

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TopNewestGuys , this is the list of wikis that need contributions! – Nihar Mahajan · 7 months, 1 week ago

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Hello,nice to see such great events taking place in the community.I'm joining the party :)

Conical hemisphere

Logging inequalities

You can't resist solving this!

Branched resistance

A sphere and a cube

Logging inequalities 2

Logging inequalities 3

Happy solving! – Rohit Udaiwal · 7 months, 1 week ago

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– Andrew Ellinor · 7 months, 1 week ago

Whoa this is a lot of problems! Logging inequalities 2 makes me want to cry, but I can see putting logging inequalities 3 in a challenge quiz. ;)Log in to reply

– Rohit Udaiwal · 7 months, 1 week ago

Yeah,Logging inequalities 2 seemed unsuitable for a level 3 challenge quiz so I posted Logging inequalities 3.Thanks for selecting it :-)Log in to reply

I have a problem involving resistors. This is an old one, though. – Efren Medallo · 7 months, 1 week ago

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– Andrew Ellinor · 7 months, 1 week ago

Whoa this looks really hard! I'll be sure it goes in a difficult resistors quiz. Thanks! Keep throwing your fun resistors questions here (easy or hard).Log in to reply

– Efren Medallo · 7 months ago

Thank you!Log in to reply

I am sorry to have missed the previous party \(\ddot\frown\). I was able to do this for this party:

Beautiful resistors

Beautiful resistors - 2

Cubes form cuboid

Due to my exams, that's all I can help, will surely contribute more in the next party!

I have few old ones, you may consider this and this too. Thanks! \(\ddot\smile\) – Sravanth Chebrolu · 7 months, 1 week ago

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– Andrew Ellinor · 7 months, 1 week ago

Don't worry about it Sravanth. Every contribution counts.Log in to reply

– Sravanth Chebrolu · 7 months, 1 week ago

Thanks! \(\huge\ddot\smile\)Log in to reply

My surface area question.

Cube-Sphere – Lee Care Gene · 7 months, 1 week ago

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especiallywith the diagrams you provide. How'd you make this graphic, paint again? – Andrew Ellinor · 7 months, 1 week agoLog in to reply

– Lee Care Gene · 7 months, 1 week ago

I used an online generator.Log in to reply

Actually, this is my old one on Algebra-Logarithm, but I still enjoy it: Out of Reach – Worranat Pakornrat · 7 months, 1 week ago

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– Andrew Ellinor · 7 months, 1 week ago

I like it! I think this would belong more in Exponential Inequalities, given that you're solving something like \(2^x > k.\) Granted, you have to take a log to figure out \(x,\) but for Logarithmic Inequalities, I think there should be a log already present in the problem.Log in to reply

Tricky Quadratic Logarithm. Hope you'll like it, too. ;) – Worranat Pakornrat · 7 months, 1 week ago

Thanks, Andrew. I just came up with a new one inLog in to reply

For resistors, I'd suggest my Short Circuit? and (much harder) Path of Less Resistance. – Arjen Vreugdenhil · 7 months, 1 week ago

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Here are 2 problems that I have made:

Resistors - 666

Graph theory - Bipartite Graph(s)

More problems are on their way! – Pranshu Gaba · 7 months, 1 week ago

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– Andrew Ellinor · 7 months, 1 week ago

I'm loving the bipartite graph problem. That works both for computer science and combinatorics. ;)Log in to reply

Wow. Good News @Andrew Ellinor \( :) \)

Here are my \(3\) new questions for Surface Area. Will definitely add more in due course of time.

1) Percentage Increase

2) Cuboid cut into cubes

3) Cube Surface Area Increase – Vignesh Rao · 7 months, 1 week ago

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– Andrew Ellinor · 7 months, 1 week ago

These awesome graphics always add value to a problem. I know I'll be picking at least one of these (or maybe all three). Thanks Vighnesh!Log in to reply

– Vignesh Rao · 7 months, 1 week ago

\(\huge \color{blue}{\ddot \smile} \) \( \boxed { \boxed{\text{Will try to add more in the near future}}}\)Log in to reply

My new question on Geometry-Surface Area has come: Pyramidal Mystery.

Enjoy! ;) – Worranat Pakornrat · 7 months ago

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\( \text{Another surface area problem :}\) Ratio of surface areas – Vignesh Rao · 7 months ago

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Another new one of mine on Geometry-Surface Area: Colorful Prisms.

Enjoy! ;) – Worranat Pakornrat · 7 months ago

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My question on Calculus-Parametric Equations is here: Time Zero.

Do you know what happens at the dawn of time? – Worranat Pakornrat · 7 months ago

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Root Approximation: Do you know Soumava's algorithm? – Agnishom Chattopadhyay · 7 months, 1 week ago

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My third surface area question.

Cube Sliced In Half – Lee Care Gene · 7 months, 1 week ago

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Andrew likes Resistors – Rajdeep Dhingra · 7 months, 1 week ago

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– Andrew Ellinor · 7 months ago

You're right, I do like resistors -w-w-Log in to reply

For surface area:

This isn't rocket science, it's rocket math! – Hobart Pao · 7 months, 1 week ago

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– Andrew Ellinor · 7 months ago

Ohh yeah, this is a winner. Very creative.Log in to reply

My problems for Resistors and Surface area : Pipe is that , Shocker! . – Anish Harsha · 7 months, 1 week ago

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– Andrew Ellinor · 7 months ago

Both great. I think we're even featuring one on social media. ;)Log in to reply

– Anish Harsha · 7 months ago

ThanksLog in to reply

For Geometry Circles 1 And Circle 2And Calculus Happy nightmare – Refaat M. Sayed · 7 months, 1 week ago

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these topics – Andrew Ellinor · 7 months, 1 week ago

Hi Refaat, these are great and I'll make sure they get to the right quiz a some point, but currently this problem writing party is focused onLog in to reply

Here is one for mechanics: Spinning Skater. – Arjen Vreugdenhil · 7 months, 1 week ago

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– Andrew Ellinor · 7 months, 1 week ago

Perfect. This one belongs in a quiz for sure. Thanks as always, Arjen! Keep them coming if you've got them. :)Log in to reply

More coming. These are for calculus of parametric equations.

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@Arjen Vreugdenhil already wrote a beautiful solution to one of them. That makes it more likely to wind up in a challenge quiz. ;) – Andrew Ellinor · 7 months, 1 week ago

Ahhh, these are great Hobart.Log in to reply

Here is my question on logarithmic inequalities. – Chan Lye Lee · 7 months, 1 week ago

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– Andrew Ellinor · 7 months, 1 week ago

Whoa, level 5! I never expected to see one of those in logarithmic inequalities. If we have enough hard logarithmic inequalities problems, I think it would be great to make a level 4-5 challenge quiz for this chapter!Log in to reply

I'll start making more problems tomorrow, here is one for logarithmic inequalities – Hjalmar Orellana Soto · 7 months, 1 week ago

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– Andrew Ellinor · 7 months, 1 week ago

Good one! I wasn't even thinking about the discontinuity that occurs. This makes for a fun, challenging problem for sure. This will definitely wind up in a quiz. Thanks! Feel free to throw more into this note. :)Log in to reply

Surface Area – Hjalmar Orellana Soto · 7 months, 1 week ago

In my problems made before I found one that might be good forLog in to reply

– Andrew Ellinor · 7 months ago

Whoa, so many! Haha, awesome.Log in to reply

Rotational Kinetic Energy – Hjalmar Orellana Soto · 7 months, 1 week ago

Thank you a lot, here is one forLog in to reply

Calculus of Parametric Equations – Hjalmar Orellana Soto · 7 months, 1 week ago

Here is one forLog in to reply

More problems:

Mechanics - Rotational Kinetic Energy

Calculus of Parametric Equations:

Second Derivative

Area

Arc Length

Surface Area

Volume

And this is the complete set of problems that I submitted for the 3rd party: My Problems – Pranshu Gaba · 7 months ago

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This is my question on Geometry-Surface Area: Speak Louder.

Hope it's not too complicated. ;) – Worranat Pakornrat · 7 months ago

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This is a bit off the beaten path, but it involves Calculus of parametrized curves: Tangential Curve.

(More or less the same problem is Tangential Network #1, but it does not explicitly refer to parametrized curves. Even cooler is Tangential Network #2, but no parameters there, either.) – Arjen Vreugdenhil · 7 months ago

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This is my easy one on Combinatorics-Data Presentation: Shall we go shopping?.

Probably too easy though. ;) – Worranat Pakornrat · 7 months ago

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My fifth surface area question.

Quite A Long Way Up – Lee Care Gene · 7 months ago

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Another new one on Combinatorics-Data Presentation: Fruit Lovers.

What is your favorite fruit? ;) – Worranat Pakornrat · 7 months ago

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Once there were cubes and spheres, a problem for surface area. :) – Efren Medallo · 7 months ago

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– Andrew Ellinor · 7 months ago

Thanks Efren! I'd be careful though. You might need to edit your problem statement. You said the answer takes the form (A/B)^n, but (1/2)^3 and (1/8)^1 are of the same form, are they not?Log in to reply

– Efren Medallo · 7 months ago

Oops. You're right. My bad!Log in to reply

3.14159geon 1

3.14159geon 2 – Nihar Mahajan · 7 months ago

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My fourth surface area question.

Ground Into Atoms – Lee Care Gene · 7 months, 1 week ago

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Here are my entries.....

Geometry.

Electric Resistors.

Human Resistance.

Nice Party..........Enjoyed many sums.... – Manmeswar Patnaik · 7 months, 1 week ago

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– Andrew Ellinor · 7 months ago

Great questions! I especially like your resistor entries.Log in to reply

– Manmeswar Patnaik · 7 months ago

Thanks Sir!! I am glad that you liked those..............Log in to reply

Here's my easy new question on Geometry-Surface Area: Blue or Red.

It's quite illusive actually. ;) – Worranat Pakornrat · 7 months, 1 week ago

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– Andrew Ellinor · 7 months ago

Haha, wouldn't have expected that as the answer.Log in to reply

– Worranat Pakornrat · 7 months ago

Yeah, that's what I thought, too. Look can be deceptive.Log in to reply

Hi @Andrew Ellinor, Here is my set of problems: (I will edit this and include 6 problems finally) Do check them out and let me know your views on them,

Numerical Methods

Inequality – Soumava Pal · 7 months, 1 week ago

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– Andrew Ellinor · 7 months ago

I like the Soumava's algorithm question! I think we'll end up using that one because we don't have many root approximation questions. However, the inequality problem you submitted doesn't involve any logarithms! :PLog in to reply

@Andrew Ellinor Sir.

Thanks a lot,P.S. I will add a few more questions I reckon.

P.P.S. I submitted the inequality problem for Algebra. Was is necessary btw to make it a logarithmic inequality? I will post one too, in that case. – Soumava Pal · 7 months ago

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publish page. – Andrew Ellinor · 7 months ago

Yep. You can see what topics we need on theLog in to reply

got another problem in geometry, surface area - how much paint do you need? – Margaret Zheng · 7 months, 1 week ago

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`[How much paint do you need?](https://brilliant.org/problems/how-much-paint-do-you-need/)`

so that your link appears like this:How much paint do you need? – Andrew Ellinor · 7 months ago

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@Andrew Ellinor and I will do so for the rest of my problems. – Margaret Zheng · 7 months ago

That is very helpful. Thank you very muchLog in to reply

How about February 29 though? It's a leap year this year... – Aloysius Ng · 7 months, 1 week ago

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– Nihar Mahajan · 7 months ago

I agree hahahaLog in to reply

Too many twos

What's with these logs – Vighnesh Shenoy · 7 months, 1 week ago

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@Vighnesh Shenoy – Chinmay Sangawadekar · 7 months, 1 week ago

Cool problems !!Log in to reply

– Vighnesh Shenoy · 7 months, 1 week ago

Thanks!Log in to reply

Hi! @Andrew Ellinor i missed the last party but i really want to contribute to this one so here's a problem involving resistors. Resistors tend to infinty please try this problem and tell me your views about it \(:)\) – Racchit Jain · 7 months, 1 week ago

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onetrue statement so that you can put your question in multiple choice format next time. Currently it's just a little hard to read. ;) – Andrew Ellinor · 7 months agoLog in to reply

– Racchit Jain · 7 months ago

thanks for the advice :)Log in to reply

– Racchit Jain · 7 months ago

I can't change my format to multiple choice now, can I?Log in to reply

Here is the question on Logarithmic inequalities. – Rishik Jain · 7 months, 1 week ago

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– Andrew Ellinor · 7 months ago

Excellent Rishik! This question is perfect for the level 1-2 quiz we're trying to create.Log in to reply

My second surface area question.

Turning Cuboids Into A Cube – Lee Care Gene · 7 months, 1 week ago

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– Vignesh Rao · 7 months, 1 week ago

Awesome Surface Area problems....Log in to reply

– Lee Care Gene · 7 months, 1 week ago

Thanks! I'll make more in the future.Log in to reply

– Vignesh Rao · 7 months, 1 week ago

Will be eagerly awaiting for those problems....Log in to reply

More problems!

Root Approximation - Quintic Pi Polynomial

Logarithmic Inequalities - Tens everywhere – Pranshu Gaba · 7 months, 1 week ago

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Not sure why the logarithmic inequality problem is proving to be so hard but people love it! – Andrew Ellinor · 7 months ago

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My new resistor problem : Can't Resist. – Anish Harsha · 7 months, 1 week ago

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Sorry I couldn't participate in the second problem writing party due to exams. Now that they are over, I can finally participate in this party :) Here is an easy problem to start with. – Svatejas Shivakumar · 7 months, 1 week ago

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– Andrew Ellinor · 7 months ago

Thanks Svatejas! I hope you continue participating in this party and future parties.Log in to reply

Here are two more problems:

Surface Area - Surface Area of a Molecule

Data Presentation - Where have the Jelly Beans gone?

And here's one from the last party:

Data Presentation - Jon's Hypothesis – Pranshu Gaba · 7 months, 1 week ago

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For rotational kinetic energy:

Slide, Hook, Roll (an older problem)

Flywheel

Square it away

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Here's a yummy question on Geometry-Surface Area: Some Orange?.

Feel free to taste it. ;P – Worranat Pakornrat · 7 months, 1 week ago

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– Vignesh Rao · 7 months, 1 week ago

A palatable question indeed.Log in to reply

– Worranat Pakornrat · 7 months, 1 week ago

Thanks. I got the idea when I saw oranges in the mall. Lol...Log in to reply

Resistors: Cantor Equivalent

Surface Area: Dimples – Arjen Vreugdenhil · 7 months, 1 week ago

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Here is my entry (at last) – Lakshya Sinha · 7 months, 1 week ago

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Here is my Surface Area problem, I will come up for another ASAP

Square and Triangle – Jason Chrysoprase · 7 months, 1 week ago

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For resistors..

Is this simple ratio and proportion?

On bridges

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Another surface area (may be too easy?)

Find the box tops – Hobart Pao · 7 months, 1 week ago

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– Andrew Ellinor · 7 months, 1 week ago

No such thing as too easy! I'll make sure it finds a home.Log in to reply

– Hobart Pao · 7 months, 1 week ago

Thanks! I appreciate it.Log in to reply

This is my new one on Algebra-Logarithm Inequality: Tricky Quadratic Logarithm.

Surely you won't need your calculator if you can spot a trick in this one. ;) – Worranat Pakornrat · 7 months, 1 week ago

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– Andrew Ellinor · 7 months, 1 week ago

Ahhh, I spot the trick. I'll keep it a secret though. ;)Log in to reply

– Worranat Pakornrat · 7 months, 1 week ago

Oh, you already saw it. This is what math problem in Thai class looks like. Not a piece of cake, right? ;)Log in to reply

This is my new problem on Combinatorics-Data Presentation: Have you got health insurance?

It's kind of mixture of basic statistics, too. Suits for anyone who's interested in insurance company. ;) – Worranat Pakornrat · 7 months, 1 week ago

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– Andrew Ellinor · 7 months, 1 week ago

Nice! I was hoping we could finally create the data presentation quiz. I'm afraid some people find it boring, but you definitely know how to make it fun with these kinds of problems.Log in to reply

– Worranat Pakornrat · 7 months, 1 week ago

Thanks. It was kind of difficult to make an easy problem fun to play with, but glad you like it. ;)Log in to reply

This is my question for kinematics- Three runners One winner. Hope you like it – Lakshya Singh · 7 months, 1 week ago

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– Nihar Mahajan · 7 months, 1 week ago

Thanks for having a will to contribute to wiki party Lakshya! But unfortunately , kinematics does not fall in the list of wikis that need contribution this time.I just post the list of desired wikis above.Log in to reply

For Limits :

Easy Limits 2 and Easy Limits – Chinmay Sangawadekar · 7 months, 1 week ago

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– Nihar Mahajan · 7 months, 1 week ago

Sorry, but the selection of problems for limits of functions is already done.Log in to reply

– Chinmay Sangawadekar · 7 months, 1 week ago

okay :(Log in to reply