I want to completely mute specific sounds (not all). Using /stopsound is a quite imperfect way of doing so, because then there's fractions of the "muted" sound(s) sometimes still "slipping through" causing them to not be completely muted. Does anyone know if it is possible to completely mute them, and if so, how?  (Resourcepack may be used, as long as you can tell me how to remove/replace a sound already existing in the game)  Edit: I need an explanation on what to do, I have searched for how to do sound files in resourcepacks, but I need to know how to add sounds (as in, I don't know what name to use for a specific sound in the game). I want all crossbow sounds, music and player sounds all to be muted. But in all 1.14 resourcepacks that I have found up until now, none have sound files for crossbows, usually none at all actually.  In short, I need to know how to name the sound files.
In Minecraft, there are a lot of cool sounds. I decided to find there location and move them to my desktop. I have Ubuntu, and if when I remove them from that folder will Minecraft be unable to play them or is it smart enough to figure out that they are gone and download them again. Before minecraft was installed, it had to download the files. I even moved my favorite song (creative 6) from the sounds. The sounds are not labeled and have seemingly random names like b0b12118a97ddd733a50e9382e91a21652568641 and how will I know what to call them that will be recognized without digging through the index if Minecraft fails to download them? Or do I not have to worry because it will download them again upon launch?  Note: Why does it not label them and call them random names?
In my student book they separate these two and indicate that sparks need high voltage to occur while arcs need low voltage with normal or low pressure and electric arcs CAN come with heat and bright light. But when I search on the web many people said that arc is just a hotter version of spark. So what is the difference between them? What is the difference between "lay" and "lie"? Fast, accurate 2d collision I'm working on a 2d topdown shooter, and now need to go beyond my basic rectangle bounding box collision system.  I have large levels with many different sprites, all of which are different shapes and sizes. The textures for the sprites are all square png files with transparent backgrounds, so I also need a way to only have a collision when the player walks into the coloured part of the texture, and not the transparent background.  I plan to handle collision as follows:   Check if any sprites are in range of the player Do a rect bounding box collision test Do an accurate collision (Where I need help)   I don't mind advanced techniques, as I want to get this right with all my requirements in mind, but I'm not sure how to approach this. What techniques or even libraries to try. I know that I will probably need to create and store some kind of shape that accurately represents each sprite minus the transparent background.  I've read that per pixel is slow, so given my large levels and number of objects I  don't think that would be suitable. I've also looked at Box2d, but haven't been able to find much documentation, or any examples of how to get it up and running with SFML. How can I include value of sharepoint's version column in a word document? Rising edge pulse detector from logic gates The circuits I describe are entirely made of 7400 series logic gates (7402, 7404 and 7408 ic). I'm trying to build a rising (positive) edge pulse detector using logic gates.  The following circuit should work in theory:   (see )  I do not expect the short output to be seen through a LED so, to test it, I make it trigger an SR latch to its up state:    However, it doesn't have effect on the latch. So I added an inductor to delay the input to the NOT gates in the pulse detector circuit and it worked:   But now I can see the short flashing output through a LED which I should not because it would mean it is too long to work with a circuit like that:   Which intends to toggle the D Latch output on each clock rising edge (Note that this is a D Latch not a D Flip-flop)  And anyway there is no place for inductors in integrated circuits so there must be a way to do this only with logic gates. Can someone solve this mystery?  BTW It does not show in my schematics but I did put 10K pull-down resistors where there might be floating pins. Boot problem after hanging and manual power off ( Stopping User Manager for UID 121... ) My Ubuntu stalled while running Android's VirtualBox version, so I powered off the system. But after reset it stopped during this line:     Stopping User Manager for UID 121... _ So i googled it and have read  question and tried these steps:  Boot into Recovery Mode, drop to a root shell, and follow the steps below:   Run mount -o rw,remount / to mount the drive in Read-Write mode.Run sudo apt-get purge nvidia-* to purge the NVIDIA driver.You may also need to purge xserver-xorg and reinstall it, which will  require you to enable networking in Recovery.Reboot. You may have to add the nouveau.modeset=0 flag in GRUB to boot properly (Check my Q&amp;A for specifics).   You should be past the screen flicker and be at your desktop.  But in doing this step:  Now reinstall the NVIDIA drivers the proper way:sudo apt-get install  nvidia-367 (or 340, 352, 364, 370, whichever works).Reboot again.  I found i have not internet, and my WiFi is not in ifconfig list!!! By running :     Iw wlp2s0 scan   I get :  N180211 not found I also search for it and not understand why WiFi gone off. Now i thinking to use live USB of ubuntu to download NVIDIA and xserver-xorg and the install the by dpkg command during tty2. Update : in Ubuntu live i have this settings :  ubuntu@ubuntu:~$ sudo lshw -c video   *-display                         description: VGA compatible controller        product: HD Graphics 620        vendor: Intel Corporation        physical id: 2        bus info: pci@0000:00:02.0        version: 02        width: 64 bits        clock: 33MHz        capabilities: pciexpress msi pm vga_controller bus_master cap_list rom        configuration: driver=i915 latency=0        resources: irq:129 memory:a2000000-a2ffffff memory:b0000000-bfffffff ioport:6000(size=64) memory:c0000-dffff   *-display        description: 3D controller        product: GM108M [GeForce 920MX]        vendor: NVIDIA Corporation        physical id: 0        bus info: pci@0000:03:00.0        version: a2        width: 64 bits        clock: 33MHz        capabilities: pm msi pciexpress bus_master cap_list        configuration: driver=nouveau latency=0        resources: irq:128 memory:a3000000-a3ffffff memory:90000000-9fffffff memory:a0000000-a1ffffff ioport:3000(size=128)  and ubuntu@ubuntu:~$ sudo lshw -c display   *-display                         description: VGA compatible controller        product: HD Graphics 620        vendor: Intel Corporation        physical id: 2        bus info: pci@0000:00:02.0        version: 02        width: 64 bits        clock: 33MHz        capabilities: pciexpress msi pm vga_controller bus_master cap_list rom        configuration: driver=i915 latency=0        resources: irq:129 memory:a2000000-a2ffffff memory:b0000000-bfffffff ioport:6000(size=64) memory:c0000-dffff   *-display        description: 3D controller        product: GM108M [GeForce 920MX]        vendor: NVIDIA Corporation        physical id: 0        bus info: pci@0000:03:00.0        version: a2        width: 64 bits        clock: 33MHz        capabilities: pm msi pciexpress bus_master cap_list        configuration: driver=nouveau latency=0        resources: irq:128 memory:a3000000-a3ffffff memory:90000000-9fffffff memory:a0000000-a1ffffff ioport:3000(size=128)  and : ubuntu@ubuntu:~$  cat /etc/os-release NAME=&quot;Ubuntu&quot; VERSION=&quot;18.04.3 LTS (Bionic Beaver)&quot; ID=ubuntu ID_LIKE=debian PRETTY_NAME=&quot;Ubuntu 18.04.3 LTS&quot; VERSION_ID=&quot;18.04&quot; HOME_URL=&quot;https://www.ubuntu.com/&quot; SUPPORT_URL=&quot;https://help.ubuntu.com/&quot; BUG_REPORT_URL=&quot;https://bugs.launchpad.net/ubuntu/&quot; PRIVACY_POLICY_URL=&quot;https://www.ubuntu.com/legal/terms-and-policies/privacy-policy&quot; VERSION_CODENAME=bionic UBUNTU_CODENAME=bionic  please consider the above three output has token form Ubuntu live flash system. What do you suggest and what do you think about reason of this failure? Also do you think it must be reported by me in ubuntu site, or it will be done automatically? Thanks. How can I reinstall GRUB to the EFI partition? I want to reinstall GRUB 2 and I found these instructions: . In my case, the boot loader is installed in the EFI partition. If I use the commands provided in this guide, will GRUB be reinstalled to the EFI partition automatically, or will it be installed into the root partition where Ubuntu is installed ? Obviously, I do not want this to happen. Having trouble with Windows XP Read Only Settings on a folder I am having trouble with a folder that needs to be read-write for iTunes to open. For a while it was read-write, but it seemingly inexplicably changed to read-only now. When I try to change it back from that, it says it does it, but as soon as I try to open iTunes or the properties for the folder it will be listed as read-only again.  If anyone knows how I can change the folder from read-only so that it will be permanently read-write it would be incredibly helpful.  How can one change the properties of a file/folder from read-only to read-write in Windows XP? Very large log files, what should I do? "Eat" is to "feed" as "drink" is to what? I can say "I feed someone". Am I forced to say "I give someone a drink", or is there a single word for this (as in "I [verb] someone")?  Unfortunately my thesaurus can't really help me. How does carbon dioxide or water vapour absorb thermal infra red radiation from the sun? We are all told at school water vapour and carbon dioxide are the top two greenhouse gases, and that they absorb thermal infra red radiation, trap heat and warm up the Earth. My question is how do they do that? Why can't Oxygen or Nitrogen or any other gas not absorb infra red radiation as well as water vapour or CO2? Environments are allowed to have arguments, but reference to those arguments can only appear in the opening code of the environment, and not the closing code.  What is the reason for this, and are there preferred ways around it?  e.g.  \newenvironment{foo}[1]% {some code #1} % allowed {some code #1} % not allowed Limit of $n/\ln(n)$ without L'Hôpital's rule I am trying to calculate the following limit without L'Hôpital's rule:     $$\lim_{n \to \infty} \dfrac{n}{\ln(n)}$$   I tried every trick I know but nothing works. You don't have to prove it by definition. How can I keep track of a decimal number that indicates the current paragraph's place in a logical hierarchy and print it in the margin of each paragraph?  (To yield a numbering in the style of Tractatus Logico-Philosophicus).  \def\on{} \def\down{} \def\up{}  \on This is the first paragraph, paragraph number 1.  \on This is paragraph number 2.  \down This is paragraph number 2.1  \down 2 This is 2.101  \up This is 2.11  \down 2.111  \up 3 3  \bye   If \down is starred, begin with zero.  If \up is followed by an integer, it should take it as an argument, unless there is a newline between \up and the integer.  An indefinite number of decimals should be possible.  PS.  I apologize for changing the question after (2) answers have been given, but I realize I failed to appreciate a feature of Wittgenstein's numbering: the last decimal is never 0.  Therefore, \down &lt;n&gt; is better than \down*, as now demonstrated above.  I think the 0 is supposed to indicate an additional level of unimportance. Let's say we have $2$ particles facing each other and each traveling (almost) at speed of light.    Let's say I'm sitting on #$1$ particle so in my point of view #$2$ particle's speed is (almost) $c+c=2c$, double light speed? Please say why I am incorrect :)    EDIT: About sitting me is just example, so in point of view of #1 particle, the second one moves at (almost) $c+c=2c$ speed? Proving $\lim \frac{x^n-a^n}{x-a}=n\cdot a^{n-1}$ Related:  (not a dupe, that's a feature request and was closed as a dupe of another one)        (old) post does indeed say that Link-only answers can be flagged as NAA, but there are a lot of posts like  which define Not An Answer is a way that it doesn't apply to link-only answers.  Can we get some up-to-date consensus on this? That link only answers are not allowed is . Complex Collision Boxes I'm trying to get a ball to go through in between the cup gear things shown in the screenshot below.   It seems that the collision box does not consider the cups. Yes, the ball fits and they are rotating in the right direction.  If there is already an answer to this, please link it.       If you have any questions about what is going on/ what the project is, feel free to ask. A finite sum involving the binomial coefficients and the harmonic numbers Wikipedia has a proof of the identity $$ H_{n} =\sum_{k=1}^{n} (-1)^{k-1} \binom{n}{k} \frac{1}{k}$$    Curiously, there is also the identity  $$ \frac{1}{n} = \sum_{k=1}^{n} (-1)^{k-1} \binom{n}{k} H_{k} $$  Can the second identity be derived from the first one? How do you programmatically set an attribute?