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App Inventor 2 向心力实验App - 探究向心力F与角速度ω、半径r、质量m的关...
...心物理公式
公式含义F = m · r · ω²向心力a = r · ω² = v²/r向心加速度v = r · ω线速度T = 2π/ω = 2πr/v周期
需要探究的三个关系
关系固定量变量预期结论F vs ωm, r 固定ω 变化F ∝ ω²（二次函数）F vs rm, ω 固定r 变化F ∝ r（正...
How do you convert an entire directory with ffmpeg?
How do you convert an entire directory/folder with ffmpeg via command line or with a batch script?
24 Answers
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What is the difference between static_cast and C style casting?
...ny reason to prefer static_cast<> over C style casting? Are they equivalent? Is their any sort of speed difference?
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How to compare a local git branch with its remote branch?
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To update remote-tracking branches, you need to type git fetch first and then :
git diff <masterbranch_path> <remotebranch_path>
You can git branch -a to list all branches (local and remote) then choose branch nam...
How do I create a self-signed certificate for code signing on Windows?
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How to check if character is a letter in Javascript?
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I believe this plugin has the capabilities you seek: http://xregexp.com/plugins/ (github link: https://github.com/slevithan/xregexp)
With it you can simply match all unicode letters with \p{L}.
Read the header of this source file to see w...
Android Fragment handle back button press [duplicate]
I have some fragments in my activity
25 Answers
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What's the easiest way to escape HTML in Python?
...capes:
< to &lt;
> to &gt;
& to &amp;
That is enough for all HTML.
EDIT: If you have non-ascii chars you also want to escape, for inclusion in another encoded document that uses a different encoding, like Craig says, just use:
data.encode('ascii', 'xmlcharrefreplace')
D...