John Cuthber

25 minutes ago, Sensei said:

Do you read what you quote?

Yes
 

26 minutes ago, Sensei said:

let alone actually go into low orbit around it,

6 hours ago, Sensei said:

and so what?

And so it won't end up  in orbit round the sun.

Had  you forgotten what you were replying to?

On 10/10/2023 at 7:41 PM, Halc said:

Similar reasoning shows why it is so much easier to escape the solar system from Earth's orbit than it is to drop an object into the sun, let alone actually go into low orbit around it, which is currently beyond our technological limits.

6 hours ago, Sensei said:

Oxygen can be (and is) regenerated from CO₂, which is exhaled. "Half" of the Apollo 13 movie is about how to make CO₂ filters. You can have CO₂ to O₂ converters built into the suit.

That's a convenient way to carry oxygen; but not a lightweight option.
 

6 hours ago, Sensei said:

An interesting option for scuba divers in emergency situations.

Why wait for an emergency?
One of these will scrub out the CO2.
https://en.wikipedia.org/wiki/Rebreather_diving

But they aren't easy to work with.
These are even more scary.
https://en.wikipedia.org/wiki/Potassium_superoxide#Applications


And we know what happens if you mess up an oxygen generator of that sort in water.

"Analysts concluded that 23 sailors took refuge in the small ninth compartment and survived for more than six hours. When oxygen ran low, they attempted to replace a potassium superoxide chemical oxygen cartridge, but it fell into the oily sea water and exploded on contact. The resulting fire killed several crew members and triggered a flash fire that consumed the remaining oxygen, suffocating the remaining survivors."
from
https://en.wikipedia.org/wiki/Kursk_submarine_disaster

13 hours ago, Sensei said:

What does this have to do with escape velocity?

The escape velocity isn't strictly relevant, but it's a proxy for gravitational energy.
Essentially you "drop" your spacecraft towards the sun and it accelerates as it goes.
If you don't fire retro rockets to slow it down, it hits the sun.
It takes pretty much as much fuel to get something "down" as it does "up".

 

13 hours ago, Sensei said:

On the Moon's equator at noon it is the equivalent of 120 C

What's the temperature at midnight?
If you make sure your satellite rotates fairly fast you need to look at the average temperature, not the peak.


 

11 hours ago, Sensei said:

Obviously:

https://en.wikipedia.org/wiki/Moon,_South_Dakota

ps. But I think it would be a hard landing..

 

There's a difference between "flying to Moon" and "flying to the  moon".

But...
https://www.tripadvisor.co.uk/Hotel_Review-g5113909-d5113592-Reviews-The_Moon_Inn-Stoney_Middleton_Hope_Valley_Peak_District_National_Park_England.html

You don't need to reach earth's escape velocity to get to the moon. The moon is in orbit, clearly well under the influence of Earth's gravity.

You can't get to the moon with A space shuttle but...
I'm sure there's an XKCD cartoon with a small flattish hill made of fireworks.
How many shuttles would it take to launch a fully fueled shuttle into space?

14 hours ago, exchemist said:

And even that varies from ocean to ocean, hence all the markings on the Plimsoll Line on a ship's hull, showing the different limits to which it can be safely loaded:

 

That ship doesn't travel as far as some.

3 hours ago, Sensei said:

..it's hard to believe that people who write "Caution: Contents Hot" on a cup of coffee have flown to the Moon..

In addition to being a stupid attempt to defend your own bad practice; that's wrong.
The lawyers in Liebeck v. McDonald's Restaurants and the like had never flown to the moon.

39 minutes ago, Sensei said:

Why use such an arbitrarily large unit as millimeters? You can use nanometers, picometers, or even better, calculate how far a device will travel per molecule of fuel..

 

Which sort of molecule?

It's a video of the reaction not happening.
There's no precipitate.
And there's no reason to suppose that sulphuric acid is produced.

If you knew the exact time and date of the picture, and where it was taken.
And you also had a second similar picture from elsewhere, and knew the time  date etc for that one, I think you could triangulate the position of the moon by assuming the sun is "very far away".

But I think that's doing it the hard way.
 

12 hours ago, AronN3 said:

synthesis of Sulphuric acid using Oxalic acid & Cu,Fe,Mg (Sulphates)

Does that actually work?
 

37 minutes ago, exchemist said:

Sulphuric acid is readily available, surely? 

Not retail in the UK.

You can stop worrying.
2 months of dry conditions will kill most bugs- regardless of whether we are talking about bacteria viruses or what.

 

It's a remarkable story. Because snow does not cause pneumonia.

14 hours ago, Genady said:

In the late 400s BC Democritus proclaimed that “atoms and void alone exist in reality.” He offered neither evidence for this hypothesis nor calculations on which to base predictions that could confirm it. (Weinberg, Steven. Foundations of Modern Physics.)

2500 years later:

Speculations must be backed up by evidence or some sort of proof. If your speculation is untestable, or you don't give us evidence (or a prediction that is testable), your thread will be moved to the Trash Can. (Speculations Forum Rules.)

It's as if something changed in those 2500 years.
Maybe this.
https://en.wikipedia.org/wiki/Baconian_method
 

"Antimatter falls like matter"

Says clumsy scientist who dropped it.

1 hour ago, studiot said:

Perhaps a nice one, but aren't 'the 5 senses'  to do with the interaction between us and the rest of the universe ?

 

And aren't bathroom visits due to internal proceses ?

" aren't 'the 5 senses'  to do with the interaction between us and the rest of the universe ?"
The idea that there's only 5 is one of Aristotle's mistakes.

"And aren't bathroom visits due to internal proceses ?"
So?
We have more than 5 senses.

19 hours ago, Growl said:

What is real? Real is what we can detect and interpret with our 5 senses, tools and methods enhance the usefulness of our senses... is it real? Well are you able to interpret it?

If you only have 5 sense, when do you know it's time to go to the bahroom?

11 hours ago, daniel j lavender said:

  I believe to have actually decoded it. 

Does anyone else believe that?
Should they?

2 hours ago, Genady said:

they tried to mislead me about the source of their answer.

They certainly didn't try very hard, did they?
 

I think Sensei has nailed it.
You copied a puzzle, but seem to be upset that they copied the answer.

On 8/27/2023 at 9:42 AM, John Cuthber said:

Why don't you stop + retrain as a UPS driver?

 

I'm still waiting for you to explain why, if you think UPS drivers get such a  great deal, you haven't joined them.
 
Incidentally, workers demanding more money doesn't generate inflation; it reduces CEO and shareholder pay.
The bit about "the price just  gets passed on to the consumer" doesn't really work because , as you say, the consumer decides to buy cheaper from elsewhere.
So the local company realises that, if it wants to stay in business, it's better to reduce CEO/ shareholder remuneration than to go bust.

What causes inflation is printing more money or otherwise devaluing it.
Strikes just redistribute the same amount of money to a different group of people.

Inflation is the reduction of value of money.
The value of the money depends on what I can get for it- how many square yards of lawn can I get mown for a dollar?
How much bread can I buy for a pound?

If you give lots of the money to people who do not actually do, or produce anything, then (on average) you get less done for your money.

Huge CEO salaries are the worst cause of inflation.

I'm agnostic about God the same way that I'm agnostic about unicorns, hobbits and Zeus.
Is that what you had in mind?

It does, in fact, natter what we believe.

Having spent 4 years complaining about the "Screaming Spires of Oxford", I wonder what Saudi Arabia has got to do with it.

The faithful have alarm clocks...

15 hours ago, iNow said:

Not all posts come from human authors 

And some of the humans who post should know better than to spam us but...

20 hours ago, mistermack said:

I couldn't find that information. Can you link to it ? 

P 20 here might be a better estimate of the total.

https://www.meti.go.jp/earthquake/nuclear/pdf/140424/140424_02_008.pdf
It says it's about 10^16 Bq

2 hours ago, mistermack said:

They don't say if that's per day, per year, or per the 30 year time period,

That's the whole "stock".
If they let it out in one day it will still be less this year than the UK dumped this year.
If it's over the course of a year, it's less than the UK dumped in a year.
If it's over 30 years then it's 30 times less than the UK dumped per year. (Actually, it's rather  less because of decay)

However you slice it, it's not much stuff.