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

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}`	\( \boxed{123} \)

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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.