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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...
...扰
3. 手机固定：务必牢固固定手机，防止飞出
4. 安全提示：建议使用远程控制功能，实验时远离旋转装置
5. 精度限制：手机传感器精度有限，适用于教学演示，不替代专业实验设备
参考资料
- phyphox 官网
- phyphox 离心加...
get just the integer from wc in bash
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What if I'm piping with with find? I get an error: find . -path -prune -o -name "*.swift" -print0 | xargs -0 wc -l works ok but prints every file. If I use find . -path -prune -o -name "*.swift" -print0 | xargs -0 wc -l < I get an error. parse error near '\n'
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source command not found in sh shell
I have a script that uses sh shell. I get an error in the line that uses the source command. It seems source is not included in my sh shell.
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How to assert greater than using JUnit Assert?
... greaterThan(Long.parseLong(currentTokenValues[1])));
That gives an error like:
java.lang.AssertionError: timestamp
Expected: a value greater than <456L>
but: <123L> was less than <456L>
share...
Are lists thread-safe?
...s but keep the numbers big enough and run a few times and you will see the error
The FLAWED version
import threading
import time
# Change this number as you please, bigger numbers will get the error quickly
count = 1000
l = []
def add():
for i in range(count):
l.append(i)
tim...
How to convert wstring into string?
...is is deprecated (stackoverflow.com/a/42946556/211176). My compiler throws errors when I try to run this code
– adam_0
Feb 14 '18 at 19:53
6
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How to force LINQ Sum() to return 0 while source collection is empty
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I got error when I try without ToList(), since it returns nothing. But the ToList() will make the empty list and it is not giving any error when I do ToList().Sum().
– Mona
Aug 4 '16 at 10:38
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Node.js spawn child process and get terminal output live
...pt let childProcess = exec ( './script-to-run --arg1 arg1value', ( error, stdout, stderror ) => { console.log( '[CALLBACK]: ' + error ); // or stdout or stderror } ); // Same as with spawn: childProcess.stdout.on ( 'data', ( data ) => { console.log(...
Scala: Abstract types vs generics
... def back(x:B):A
}
The compiler will object with bunch of variance check errors
In that case you may gather all type requirements in additional trait and parametrize other traits over it
//one trait to rule them all
trait OO[O <: OO[O]] { this : O =>
type A <: AA[O]
type B <: BB[...
How to remove .html from URL?
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answered Sep 16 '15 at 18:05
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