Josh's physics picks: September 13, 2015

Each week, I'll be choosing four or five of the most fun and interesting problems (in my opinion) I see in the community and posting them in a set. I'll be keeping an eye on the solutions, and at the end of the week will do a writeup on those I find exemplary. I'll also point out interesting things about the topics and where possible, show how to extend the thinking to more general situations.

Here is the first set

I hope you enjoy my selections and get something out of working on them. I'm looking forward to seeing everyone's work.

Josh

#Mechanics

$</code> ... <code>$ $< / c o d e > . . . < c o d e >$ ."> Easy Math Editor

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 $</span> ... <span>$ or $</span> ... <span>$ 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}`	$\boxed{123}$

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That's a nice set! I just submitted my score.

Calvin Lin Staff - 3 years, 9 months ago

That is very Nice what is ure highest score because mine is 1,399

Samuel Creed - 3 years, 1 month ago

where did you get this picture from because i like the style of the picture because i wanna make my own quiz for this maths site

Samuell creed

Samuel Creed - 3 years, 1 month ago

Hey Sam, the picture is from the cover of "Einstein Gravity in a Nutshell" by Anthon Zee. I don't know who the artist is, but that's where I saw it.

Josh Silverman Staff - 3 years, 1 month ago

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Josh's physics picks: September 13, 2015

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Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.