# challenge

### Challenge Math Challenge - January

Merry Christmas to all who celebrate it today! Rules: a) In order for a solution to count, a full derivation or proof must be given. Answers...
Thread by: fresh_42, Jan 5, 2019, 37 replies, in forum: General Math

### Challenge Intermediate Math Challenge - July 2018

Summer is coming and brings a new intermediate math challenge! Enjoy! If you find the problems difficult to solve don't be disappointed! Just...
Thread by: fresh_42, Jul 1, 2018, 16 replies, in forum: General Math

### Challenge Basic Math Challenge - July 2018

Summer is coming and brings a new basic math challenge! Enjoy! For more advanced problems you can check our other intermediate level math...
Thread by: fresh_42, Jul 1, 2018, 62 replies, in forum: General Math

### Challenge Basic Math Challenge - May 2018

It's time for a basic math challenge! For more advanced problems you can check our other intermediate level math challenge thread! RULES: 1) In...
Thread by: QuantumQuest, May 1, 2018, 82 replies, in forum: General Math

### Challenge Math Challenge by QuantumQuest #4

Submitted by: @QuantumQuest Challenge Level: High School RULES: 1) In order for a solution to count, a full derivation or proof must be given....
Thread by: Greg Bernhardt, Jul 2, 2017, 7 replies, in forum: General Math

### Challenge Math Challenge by QuantumQuest #3

Submitted and judged by: @QuantumQuest Solution credit awarded to: @ddddd28 RULES: 1) In order for a solution to count, a full derivation or...
Thread by: Greg Bernhardt, May 22, 2017, 18 replies, in forum: General Math

### Challenge Thermochemistry Challenge Problem - Chet's Paradox

I have a reversible chemical reaction described by the balanced equation: $aA+bB=cC+dD$. I devise a reversible process to take a closed system...
Thread by: Chestermiller, May 4, 2017, 19 replies, in forum: Chemistry

### Challenge Math Challenge by QuantumQuest #2

Submitted and judged by: @QuantumQuest Solution credit: @MAGNIBORO RULES: 1) In order for a solution to count, a full derivation or proof must be...
Thread by: Greg Bernhardt, Apr 9, 2017, 13 replies, in forum: General Math

### Challenge Physics Challenge by QuantumQuest #1

Submitted and Judged by @QuantumQuest Solution credited to: @TSny RULES: 1) In order for a solution to count, a full derivation or proof must be...
Thread by: Greg Bernhardt, Mar 28, 2017, 25 replies, in forum: General Physics

### Challenge Math Challenge by Erland #2

Submitted and judged by: @Erland Solution Credit: @SSequence for 2a, 2B, C, D RULES: 1) In order for a solution to count, a full derivation or...
Thread by: Greg Bernhardt, Mar 22, 2017, 23 replies, in forum: General Math

### Challenge Math Challenge by Erland #1

Submitted by @Erland Solution Credit: @mfb RULES: 1) In order for a solution to count, a full derivation or proof must be given. Answers with no...
Thread by: Greg Bernhardt, Mar 18, 2017, 28 replies, in forum: General Math

### I Micromass' big October challenge!

Time for the october challenge! This time a lot of people sent me suggestions for challenges. I wish to thank them a lot! If you think of a good...
Thread by: micromass, Oct 1, 2016, 125 replies, in forum: General Math

### Challenge Micromass' big September challenge!

September, schools restart, summer ends, but a new challenge is here: Ranking here:...
Thread by: micromass, Sep 1, 2016, 77 replies, in forum: General Math

### Challenge Micromass' big August challenge!

August is already well underway, so time for some nice challenges! This thread contains both challenges for high schoolers and college freshmen,...
Thread by: micromass, Aug 12, 2016, 105 replies, in forum: General Math

### Challenge Micromass' big high school challenge thread

Here is a thread of challenges made especially for high school students and first year university students. All the following problems can be...
Thread by: micromass, Jul 16, 2016, 83 replies, in forum: General Math

### Challenge Micromass' big summer challenge

Summer, July, hot weather: every reason is good enough for some new challenge questions. NEW: ranking can be found here:...
Thread by: micromass, Jul 16, 2016, 42 replies, in forum: General Math

### Challenge Micromass' math challenges and ranking

List of challenges: Integral Challenge: https://www.physicsforums.com/threads/micromass-big-integral-challenge.867904/ Counterexample Challenge:...
Thread by: micromass, Jul 16, 2016, 1 replies, in forum: General Math

### Challenge Micromass' big July Challenge

In this thread, I present a few challenging problems from all kinds of mathematical disciplines. RULES: In order for a solution to count, a...
Thread by: micromass, Jul 8, 2016, 74 replies, in forum: General Math

### Challenge Micromass' big series challenge

We had integrals, so we have to have series as well. Here are 10 easy to difficult series and infinite products. Up to you to find out the exact...
Thread by: micromass, Jun 16, 2016, 35 replies, in forum: General Math

### Challenge Micromass' big probability challenge

Probability theory is very nice. It contains many questions which are very easy to state, but not so easily solved. Let's see if you can solve...
Thread by: micromass, May 20, 2016, 116 replies, in forum: General Math

### Challenge Aren't you tired of counterexamples already?

And we continue our parade of counterexamples! Most of them are again in the field of real analysis, but I put some other stuff in there as well....
Thread by: micromass, May 2, 2016, 55 replies, in forum: General Math

### Challenge Yet another counterexample challenge!

Well, the last thread of counterexamples was pretty fun. So why not do it again! Again, I present you a list with 10 mathematical statements. The...
Thread by: micromass, Apr 28, 2016, 102 replies, in forum: General Math

### Challenge Micromass' big counterexample challenge

I adore counterexamples. They're one of the most beautiful things about math: a clevery found ugly counterexample to a plausible claim. Below I...
Thread by: micromass, Apr 27, 2016, 62 replies, in forum: General Math
1. The problem statement, all variables and given/known data A solid cube of side $l = r*pi/2$ and of uniform density is placed on the highest...