He is not wrong, though…
this post was submitted on 11 Jul 2023
68 points (97.2% liked)
Don’t You Know Who I Am?
3783 readers
1 users here now
Posts of people not realising the person they’re talking to, is the person they’re talking about.
Acceptable examples include:
- someone not realising who they’re talking to
- someone acting more important than they are
- someone not noticing a relevant username
- someone not realising the status/credentials of the person they’re talking to
Discussions on any topic are encouraged but arguements are not welcome in this community. Participate in good faith - don’t be aggressive and don’t argue for arguments sake.
The posts here are not original content, the poster is not OP and doesn’t necessarily agree with or condone the views in the post. The poster is not looking to argue with you about the content in the post.
Rules:
This community follows the rules of the lemmy.world instance and the lemmy.org code of conduct. I’ve summarised them here:
- Be civil, remember the human.
- No insulting or harassing other members. That includes name calling.
- Censor any identifying info of private individuals in the posts. This includes surnames and social media handles.
- Respect differences of opinion. Civil discussion/debate is fine, arguing is not. Criticise ideas, not people.
- Keep unrequested/unstructured critique to a minimum. If you wish to discuss how this community is run please comment on the stickied post so all meta conversations are in one place.
- Remember we have all chosen to be here voluntarily. Respect the spent time and effort people have spent creating posts in order to share something they find amusing with you.
- Swearing in general is fine, swearing to insult another commenter isn’t.
- No racism, sexism, homophobia, transphobia, xenophobia or any other type of bigotry.
- No incitement of violence or promotion of violent ideologies.
Please report comments that break site or community rules to the mods. If you break the rules you’ll receive one warning before being banned from this community.
PLEASE READ LEMMY.ORG’S CITIZEN CODE OF CONDUCT: https://join-lemmy.org/docs/code_of_conduct.html
PLEASE READ LEMMY.WORLD’S CODE OF CONDUCT: https://lemmy.world/legal
founded 1 year ago
MODERATORS
I guess technically, but Kelly is talking about an aircraft which implies the craft is still in atmosphere and therefore Mach can still be calculated.
The original thread was started by Neil deGrasse Tyson saying that Maverick would be "splattered" during ejection at mach 10. Scott Kelly responds saying he went on a space walk from the ISS at mach 25. The gardener is technically right that mach numbers don't really apply in a near vacuum. It's also kind of off topic because we know the Darkstar is in the atmosphere and not in space, and therefore there is no "re-entry". But Scott is right that the real issue would be heat and not getting splattered.
I also want to point out that we don't actually see Maverick eject, and it's likely that he would have been ejected in a capsule (like in several real aircraft like the B-58) rather than just thrown out of the plane in his pressure suit as Scott suggests.
Yes, but the gardener guy is specifically talking about the ISS flying in a vacuum. So he is not wrong. I find the comment of that Bruno dude just condescending.
The ISS does not travel in a full vaccum, so it still technically has a mach number
Do they actually calculate mach that way when they say a plane can go mach 3? Or do they just use the speed of sound at 1 atm?
I would hypothesize that the indicator for mach and air speed are decoupled from each other, as a true mach reading would likely give an indication of how hard a plane is working to push itself through the air.
Just a guess though.
It is calculated according to the speed of sound at the altitude you're in, and measured using a difference of pressure in the pitot tube.