Problem Writing Party: March 28th - April 10th - Andrew Ellinor

Hello Brilliant!

Once more, Problem Writing Party number 5 was a record breaking success: this time we made nine new quizzes! Here are the quizzes that you all helped create:

New Brilliant Challenge Quizzes
Simple Harmonic Motion: Level 2-3
Simple Harmonic Motion: Level 4-5
Functions: Level 3
Functions: Level 4
Functions: Level 5
2D Coordinate Geometry: Level 3
2D Coordinate Geometry: Level 4
2D Coordinate Geometry: Level 5
Capacitors and Transformers: Level 2-3

We're going to show off all the hard work these members of the community put in over the last week. Continue submitting your fantastic problems as we kick off our sixth Problem Writing Party!

How it Works

The party starts right now (March 28th, 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! Your problem has a better chance of being selected if you include a graphic (when appropriate) and a solution.

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 to make a submission to.

Happy writing and keep the party alive!

Markdown

Appears as

*italics* or _italics_

italics

**bold** or __bold__

bold


- bulleted
- list

bulleted
list


1. numbered
2. list

numbered
list

Note: you must add a full line of space before and after lists for them to show up correctly

paragraph 1

paragraph 2

paragraph 1

paragraph 2

[example link](https://brilliant.org)

example link

> This is a quote

This is a quote

    # I indented these lines
    # 4 spaces, and now they show
    # up as a code block.

    print "hello world"

# I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"

Math

Appears as

Remember to wrap math in $ ... $ or \[ ... \] to ensure proper formatting.

2 \times 3

2 \times 3

2^{34}

2^{34}

a_{i-1}

a_{i-1}

\frac{2}{3}

\frac{2}{3}

\sqrt{2}

\sqrt{2}

\sum_{i=1}^3

\sum_{i=1}^3

\sin \theta

\sin \theta

\boxed{123}

\boxed{123}

Easy Math Editor

This discussion board is a place to discuss our Daily Challenges and the math and science related to those challenges. Explanations are more than just a solution — they should explain the steps and thinking strategies that you used to obtain the solution. Comments should further the discussion of math and science.

When posting on Brilliant:

Use the emojis to react to an explanation, whether you're congratulating a job well done , or just really confused .
Ask specific questions about the challenge or the steps in somebody's explanation. Well-posed questions can add a lot to the discussion, but posting "I don't understand!" doesn't help anyone.
Try to contribute something new to the discussion, whether it is an extension, generalization or other idea related to the challenge.
Stay on topic — we're all here to learn more about math and science, not to hear about your favorite get-rich-quick scheme or current world events.

Markdown	Appears as
`italics` or `_italics_`	italics
`bold` or `__bold__`	bold
- bulleted - list	bulleted list
1. numbered 2. list	numbered list
Note: you must add a full line of space before and after lists for them to show up correctly
paragraph 1 paragraph 2	paragraph 1 paragraph 2
`[example link](https://brilliant.org)`	example link
`> This is a quote`	This is a quote
# I indented these lines # 4 spaces, and now they show # up as a code block. print "hello world"	# I indented these lines # 4 spaces, and now they show # up as a code block. print "hello world"

Math	Appears as
Remember to wrap math in `$` ... `$` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$

Comments

Here's my freshly made problem on Geometry-Similar Polygon: The Lightning Scar.

Do you know the secrets behind Harry Potter's lightning scar? ;)

Worranat Pakornrat - 5 years, 2 months ago

Very creative! (+1)

Hobart Pao - 5 years, 2 months ago

Thanks! Do you read Harry Potter as well? ;)

@Worranat Pakornrat – A long time ago! I used to be obsessed with it.

@Hobart Pao – Well, then this is the chance for you to find the last and the most powerful Hallow. Lol...

@Worranat Pakornrat – Oh my god, The fourth Hallow! Curious, curious . . . .

P.S: I hope you understand why I used "curious" :P

Sravanth C. - 5 years, 2 months ago

@Sravanth C. – Is that the quote from one of the characters? Hm...curious...curious...;)

@Worranat Pakornrat – Mr. Olivander

@Sravanth C. – Ah...I see but he already played his part in the Elder Wand already. Now we're looking for the spear wielder. LOL...

Here is a problem on Discrete Probability : Sandeep tosses a coin !.
Look at this problem too on Symmetric Polynomials : Is it really a Symmetry ?.

Anish Harsha - 5 years, 2 months ago

Very nice problems Anish! Thanks :)

Sandeep Bhardwaj - 5 years, 2 months ago

Thanks, sir. I dedicate the 1st problem to you ! :)

Also, see my new problem, Let's Disc, Bros !, on the topic, Volume of Revolution- Calculus.

This is my contribution for this party, will be posting more, hope it helps!

2D Kinematics: Motion Graphs.
2D Kinematics: Graphs Help Us a Lot.
Similar Polygons: Are you economic with the pizzas?.
Similar Polygons: Are they Similar?.
Magnetic Fields: Find your Poles.
Magnetic Fields: Does it matter?.
Volume of Revolution: Rotate that Function.

All the problems are wonderful. It seems that every problem is capable of making its way to the quiz. Thanks Sravanth for such great problems!

Thanks sir! Here's one more: this.

Here are some problems by Prakhar Bindal on 2D Kinematics:

@Prakhar Bindal I've collected your problems in my comment. And you can check out the latex syntax to add the link of a problem here in the comments. Thanks for the nice problems! :)

Thanks a lot

Prakhar Bindal - 5 years, 2 months ago

These are the questions in my stock:

Calculus-Volume of Revolution: Sand of Time.

Combinatorics-Probability: Hit the Jackpot! ; Crispy ABC and Fighting Fish.

How did you get such an awesome stock? ;)

I created it day by day. Gradually they filled up the whole stock. ;)

I saw Sand of Time before...

Oh, really? I thought it'd fit the topic, so I put it here.

This will be updated as necessary.

Volume of revolution:

Great great great problems. Thanks!

Thanks!

This is my new question on Geometry-Similar Polygons: Half, Half, Half.

Hope it's not too simple. ;)

Posted the solution too ;)

Saw it. You're so quick! ;)

This is my new question on Algebra-Symmetrical Polynomial: Prime, Prime, Prime.

Enjoy! ;)

Enjoying :)

For the special event of my 101 followers, I present my new question on Geometry-Similar Polygons: 101 Followers Question by Dr. Warm.

Hope you guys would like it! ;)

Congratulations for grabbing 101 followers. Nice problem Dr. Warm. :)

Thanks a lot, Sandeep! ;)

i have already added.. hope you will like to add. simple harmonic motion level 4

Aman Rajput - 5 years, 2 months ago

Interesting, thanks! :)

As for the final day of this party, I present to you, Algebra-Symmetrical Polynomials: Inverse of Inverses.

Enjoy!

Here comes my first one: Andlew's three symmetric numbers

Contributed before Dr. Warm. Mission accomplished.

Nihar Mahajan - 5 years, 2 months ago

Oh, no...how could you, @Nihar Mahajan? ;)

Nice problem, Nihar! Thanks :)

I Have a hell lot of nice problem of 2D Kinematics (Atleast 100).

I Will be posting the best of them soon

That's great! I'm waiting for your nice problems.

I Have posted 2 of them

@Prakhar Bindal – You can post the links of the problems you post here in the comment box. Thanks! :)

@Sandeep Bhardwaj – https://brilliant.org/problems/recollect-the-past-1/?ref_id=1156248

https://brilliant.org/problems/recollect-the-past-2/?ref_id=1156260

https://brilliant.org/problems/recollect-the-past-3/?ref_id=1156284

@Prakhar Bindal – You can post your problems as link by following the syntax:

$\text{[Name of the problem](link)}$

And it will appear as Name of the problem.

Here is my contribution in 2D Kinematics : Collision in mid-air!

Sahil Bansal - 5 years, 2 months ago

Great problem! Thanks :)

Symmetric Polynomial

Insanely Huge Symmetric Polynomial

A Former Brilliant Member - 5 years, 2 months ago

Can you please post the solution for second part as for some reasons my answer is not matching.

P.S. great question indeed.

neelesh vij - 5 years, 2 months ago

Actually I did a mistake in my calculation and the answer to the second part is wrong. Extremely sorry.

@A Former Brilliant Member – Nevermind that, it happens with me also.

@Neelesh Vij – The problem is correct now.

haha, great problems. Thanks :)

Here's my entry A force of different kind

The equation of force is of different kind. Thanks! :)

Here is another problem How many points to qualify?

Abhishek Chopra - 5 years, 2 months ago

Great problem Abhishek! Do you have any questions that pertain to the topics for this week's problem writing party though?

Andrew Ellinor - 5 years, 2 months ago

Guys..Try out these questions in my stock with solutions. I did not get proper responses.

Algebra - Government Budget, Mushrooms,Khan the Barber,Financial Gain

ASHWIN K - 5 years, 2 months ago

Problems are nice but quite apart from the topics of the party. Well, thanks and waiting for the party problems. :)

Here is my entry for Discrete Probability:
Biased Coin
Similar Polygons:
Harry Potter and Sphere

展豪張 - 5 years, 2 months ago

Great, thanks! :)

Are they too easy? ;)

@展豪張 – Not too easy. The problems are of intermediate level I guess. :) Keep it up!

@Sandeep Bhardwaj – I will work hard to create some harder problems(maybe level 5) ;)

Here's some problems :- Look at the constant term, Indeed Lengthy !, Will you find the value of roots

Aditya Sky - 5 years, 2 months ago

A colorful set of problems. It would be great if you could post such amazing problems from the topics selected for this party. Thanks ;)

@Aditya Sky Your problems are great. Can you post such wonderful problems from the topics selected for this party?

Hope you like this one Find out the range!

Looks difficult to me. BTW nice one. Thanks! ;)

Here's my submission to the party . I will post more soon.

$\mathbf{Kinematics}\implies$ Drive Fast !

Aditya Narayan Sharma - 5 years, 2 months ago

Nice problem. Drive fast, but don't cross the limit. ;) Thanks!

Hehe thanks sir! . I will be updating more.

Here is the set of few computer science problems on Linear Data Structures

Zeeshan Ali - 5 years, 2 months ago

Very smart set! Thanks :)

Here is a problem on Similarity

Soumava Pal - 5 years, 2 months ago

Great problem Soumava! I recommend redrawing your graphic though. The numbers are a little too small to read and they'll be even smaller if added to a quiz. Moreover, be smart about your canvas size. Make sure your graphic fills up the entire canvas instead of leaving white space around the edges. See the difference below:

Before Before

After After

@Andrew Ellinor

I am redrawing it right away Sir. :D

@Soumava Pal – Thanks!

@Andrew Ellinor – :)

@Andrew Ellinor – Is it okay now? @Andrew Ellinor

@Soumava Pal – Much, MUCH better Soumava. Thanks! Looks great now.

@Andrew Ellinor – Thank you sir. :)

Here Are Some more problems on 2 - D Kinematics

Recollect the past 4 ! Recollect the past 5 ! Recollect the past 6 !

I Request @Sandeep Bhardwaj sir to add these problems too to his previous comment

Just awesome!

sir i am not able to see points a problem corresponds to only the level of problem is visible . can you help?

@Prakhar Bindal – Brilliant doesn't display the points of a problem anymore. Only the level is displayed. So, enjoy with the level itself. ;) @Prakhar Bindal

Now it's time for Algebra-Symmetrical Polynomials: Squares In Between.

Hint: the solution is also symmetrical. ;)

Perfect symmetry! ;)

Filling up Spheres: This is an old problem, and is not just about solids of revolution. I hope this can do, though. :)

Efren Medallo - 5 years, 2 months ago

There should be a fish in the tank. Nice problem, thanks! ;)

Maybe this old problem of mine would be useful for discrete probability:

Good Car, Bad Car

Gian Tuazon - 5 years, 2 months ago

The car in the image is definitely a bad car. But the problem is good. ;) Thanks!

Here's my submission:

Volume of Revolution - Red Versus Blue!
Magnetic Field - Bar magnetic field

Pranshu Gaba - 5 years, 2 months ago

What a lovely couple of problems! Thanks :)

Thank you! I have made two more problems:

Similar Polygons - Condition for Similarity
Discrete Probability - Shuffling and Deleting

@Pranshu Gaba – Great!

Here's my new entry on Calculus-Volume by Revolution: Who ate that apple?.

Yes, Dr. Warm ate it. Anyway, thanks!

Yum! Yum! You're welcome! ;)

Been some time since I last posted a question. Anyway, here is a question for similar polygons.

Tricky Triangles

Lee Care Gene - 5 years, 2 months ago

The trick is tricky. ;)

Here are three problems for Similar Polygon Geometry: It may be Hard to Notice, Not Hard to Imagine and Can you Solve this Without Trig?

Hjalmar Orellana Soto - 5 years, 2 months ago

Amazing problems. I liked 3rd one the most. Thanks! Keep posting ;)

One more for Volume of Revolution

Here is my first contribution for Discrete Probability:How many balls?

Though its easy, I will be posting some new good problems soon.

Yash Jain - 5 years, 2 months ago

Good problem. Thanks!

Here is another of my problems on Similarity.

Thanks for the contribution. :)

@Sandeep Bhardwaj sir why am i not able to see ratings of problems only level appears

@Prakhar Bindal – Because no one can see the ratings now. Brilliant doesn't display the ratings anymore. Only level appears for a problem. Enjoy with that. :)

@Sandeep Bhardwaj – ok

Thank you, sir!

Here is next part of my problems on 2d kinematics

Recollect the past 7 !

Here is a problem on Discrete Probability

Nice extension of a classical problem!

Thanks. :)

Amazing problem. Thanks! :)

My problem on 2D Geometry : Tangents at parabola

Vatsalya Tandon - 5 years, 1 month ago

Great! Thanks for the contribution. However, this party has been over, you can participate in the upcoming parties. :)

Sandeep Bhardwaj - 5 years, 1 month ago

From where can i know that my problem has been shortlisted for quizzes or not? @Sandeep Bhardwaj sir

Prakhar Bindal - 5 years, 1 month ago

@Prakhar Bindal – You can click on the quizzes mentioned in the note and check out whether your problem has been selected. Remember that the mentioned quizzes are from the previous problem writing party.

Ok Sir :)

When is the next party coming?

Lee Care Gene - 5 years, 1 month ago

Currently planning a new type of party and redesigning this one :)

Andrew Ellinor - 5 years, 1 month ago

Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$