Things you always wanted to know the answer to [Vol. 3]

Things you always wanted to know the answer to [Vol. 3]

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Jonboy_t

5,038 posts

184 months

Saturday 27th January 2018
quotequote all
MissChief said:
RATATTAK said:
Jonboy_t said:
Most English/British singers DO sing in an American accent. There’s obviously going to be some that don’t, but try singing these in English accent;

Saturday nights alright for fighting (Elton John)
Someone like you (Adele)
Any OneDirection song
Angels (Robbie Williams)
Any Gary Barlow song
Dancing In The Street (Bowie OR Jaggers bits)

The only bands I can think of where most songs are in an english accent are Queen and The Proclaimers.

Most songs sound better with an American accent.
500 miles ?
I dare you to listen to twin atlantic and say their songs are 'americanised'!
Maybe ‘English’ accent wasn’t the right choice of words for the Proclaimers hehe

Twin Atlantic are a good example. Biffy Clyro, Neck Deep, Muse, AC/DC etc etc etc.

Maybe it’s something to do with genre to a degree? Dunno, but there’s a billion songs that I can’t imagine being sung with a British accent, even though they’re sung by a British artist!

SCEtoAUX

4,119 posts

82 months

Saturday 27th January 2018
quotequote all
Things entering the atmosphere get hot. Spacecraft have heat shields and other stuff burns up.

You don't need a heat shield to leave the atmosphere of course, you don't go fast enough in thick enough air.

So... if a spacecraft were equipped with suitably large descent engines, not unlike those found on the Apollo Lunar Landing Stage, could a craft re-enter the earth's atmosphere gently, and without the need for a heat shield at all?

I realise that the Space-X bit that comes back doesn't have a heat shield, but I assume it doesn't go high enough and drop fast enough to require one.

Short version of question: Could you bring an astronaut home from Earth orbit in a craft without a heat shield?

Dr Jekyll

23,820 posts

262 months

Saturday 27th January 2018
quotequote all
SCEtoAUX said:
Short version of question: Could you bring an astronaut home from Earth orbit in a craft without a heat shield?
You certainly could. But air resistance is such an effective way of slowing down it seems a pity not to use it. Imagine how big the shuttle fuel tanks would have had to be to carry fuel for slowing down as well as speeding up.

talksthetorque

10,815 posts

136 months

Saturday 27th January 2018
quotequote all
Jonboy_t said:
MissChief said:
RATATTAK said:
Jonboy_t said:
Most English/British singers DO sing in an American accent. There’s obviously going to be some that don’t, but try singing these in English accent;

Saturday nights alright for fighting (Elton John)
Someone like you (Adele)
Any OneDirection song
Angels (Robbie Williams)
Any Gary Barlow song
Dancing In The Street (Bowie OR Jaggers bits)

The only bands I can think of where most songs are in an english accent are Queen and The Proclaimers.

Most songs sound better with an American accent.
500 miles ?
I dare you to listen to twin atlantic and say their songs are 'americanised'!
Maybe ‘English’ accent wasn’t the right choice of words for the Proclaimers hehe

Twin Atlantic are a good example. Biffy Clyro, Neck Deep, Muse, AC/DC etc etc etc.

Maybe it’s something to do with genre to a degree? Dunno, but there’s a billion songs that I can’t imagine being sung with a British accent, even though they’re sung by a British artist!
Arctic Monkeys sprang first to mind.
Would the confederates even know what a Mardy Bum was.
A homeless person at a New Orleans Street Parade?



Willy Nilly

12,511 posts

168 months

Sunday 28th January 2018
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Is the interior of the Millennium Falcon covered in Wookie hair?

metelmickey

52 posts

83 months

Sunday 28th January 2018
quotequote all
just in the sink plug holes

Shaw Tarse

31,543 posts

204 months

Sunday 28th January 2018
quotequote all
How do we remember the words to a record from years ago?
But we can't remember why I've walked upstairs?

alorotom

11,953 posts

188 months

Sunday 28th January 2018
quotequote all
Willy Nilly said:
Is the interior of the Millennium Falcon covered in Wookie hair?
Euphemism galore right there ... clap

Strudul

1,588 posts

86 months

Sunday 28th January 2018
quotequote all
Shaw Tarse said:
How do we remember the words to a record from years ago?
But we can't remember why I've walked upstairs?
Long vs short term memory.

https://science.howstuffworks.com/life/inside-the-...

GroundEffect

13,844 posts

157 months

Sunday 28th January 2018
quotequote all
SCEtoAUX said:
Things entering the atmosphere get hot. Spacecraft have heat shields and other stuff burns up.

You don't need a heat shield to leave the atmosphere of course, you don't go fast enough in thick enough air.

So... if a spacecraft were equipped with suitably large descent engines, not unlike those found on the Apollo Lunar Landing Stage, could a craft re-enter the earth's atmosphere gently, and without the need for a heat shield at all?

I realise that the Space-X bit that comes back doesn't have a heat shield, but I assume it doesn't go high enough and drop fast enough to require one.

Short version of question: Could you bring an astronaut home from Earth orbit in a craft without a heat shield?
Yes but that would require a lot of fuel (which means they had to carry it for the whole flight, making the rocket far heavier to carry the fuel vs carrying the material to insulate the heat) to do it so they generally don't.

Craft enter the atmosphere at just below orbital speed, which for LEO is up to 18,000mph, so this explains why there's so much heat wink


Rich_W

12,548 posts

213 months

Sunday 28th January 2018
quotequote all
If NASA and Russias Space Agency one day noticed that 10 UFOs were heading through the solar system towards Earth and would arrive in a week.

Would they alert the population of the world?

The Chaos it would generate would be massive. But similarly if/when ET and his mates turned up people might ask questions.


Similarly, I assume they would be trying to contact them?

majordad

3,601 posts

198 months

Monday 29th January 2018
quotequote all
They’re customers , or their kids are, it’s like battery hen eggs.

Ayahuasca

27,427 posts

280 months

Tuesday 30th January 2018
quotequote all
GroundEffect said:
SCEtoAUX said:
Things entering the atmosphere get hot. Spacecraft have heat shields and other stuff burns up.

You don't need a heat shield to leave the atmosphere of course, you don't go fast enough in thick enough air.

So... if a spacecraft were equipped with suitably large descent engines, not unlike those found on the Apollo Lunar Landing Stage, could a craft re-enter the earth's atmosphere gently, and without the need for a heat shield at all?

I realise that the Space-X bit that comes back doesn't have a heat shield, but I assume it doesn't go high enough and drop fast enough to require one.

Short version of question: Could you bring an astronaut home from Earth orbit in a craft without a heat shield?
Yes but that would require a lot of fuel (which means they had to carry it for the whole flight, making the rocket far heavier to carry the fuel vs carrying the material to insulate the heat) to do it so they generally don't.

Craft enter the atmosphere at just below orbital speed, which for LEO is up to 18,000mph, so this explains why there's so much heat wink
If the re-entering object were aerodynamically more efficient - say needle shaped - it would not need a heat shield. Of course, it would be travelling rather quickly when it it the ground ...

Nimby

4,604 posts

151 months

Tuesday 30th January 2018
quotequote all
A spaceship in orbit has a given amount of kinetic energy. That's all going to become heat by the time it's stationary on the ground; either gradually via the heat-shield, or all at once by ballistic impact.

Thermodynamics - it's the law.

Bluedot

3,596 posts

108 months

Tuesday 30th January 2018
quotequote all
Do countries still use 'old school' type spies ?
Agents going undercover in foreign countries to find secrets etc.
And if they do, what happens if they get caught ?

I'm thinking of more the bigger countries so USA, UK etc. dropping a spy into Russia or vice versa.


MartG

20,696 posts

205 months

Tuesday 30th January 2018
quotequote all
Ayahuasca said:
GroundEffect said:
SCEtoAUX said:
Things entering the atmosphere get hot. Spacecraft have heat shields and other stuff burns up.

You don't need a heat shield to leave the atmosphere of course, you don't go fast enough in thick enough air.

So... if a spacecraft were equipped with suitably large descent engines, not unlike those found on the Apollo Lunar Landing Stage, could a craft re-enter the earth's atmosphere gently, and without the need for a heat shield at all?

I realise that the Space-X bit that comes back doesn't have a heat shield, but I assume it doesn't go high enough and drop fast enough to require one.

Short version of question: Could you bring an astronaut home from Earth orbit in a craft without a heat shield?
Yes but that would require a lot of fuel (which means they had to carry it for the whole flight, making the rocket far heavier to carry the fuel vs carrying the material to insulate the heat) to do it so they generally don't.

Craft enter the atmosphere at just below orbital speed, which for LEO is up to 18,000mph, so this explains why there's so much heat wink
If the re-entering object were aerodynamically more efficient - say needle shaped - it would not need a heat shield. Of course, it would be travelling rather quickly when it it the ground ...
Quite the opposite actually - blunt objects create a detached shockwave which keeps a fair bit of the heat away from the surface. A sharp nose would not do this and would heat up quicker and to a higher temperature

V8mate

45,899 posts

190 months

Tuesday 30th January 2018
quotequote all
Bluedot said:
Do countries still use 'old school' type spies ?
Agents going undercover in foreign countries to find secrets etc.
Yes.


Bluedot said:
And if they do, what happens if they get caught ?
If I told you, I've have to kill you.

Dr Jekyll

23,820 posts

262 months

Tuesday 30th January 2018
quotequote all
Bluedot said:
Do countries still use 'old school' type spies ?
Agents going undercover in foreign countries to find secrets etc.
And if they do, what happens if they get caught ?

I'm thinking of more the bigger countries so USA, UK etc. dropping a spy into Russia or vice versa.
They do, but most of their work is finding locals who might be turned into spies or might give information away inadvertently.

Jonnny

29,401 posts

190 months

Tuesday 30th January 2018
quotequote all
GroundEffect said:
SCEtoAUX said:
Things entering the atmosphere get hot. Spacecraft have heat shields and other stuff burns up.

You don't need a heat shield to leave the atmosphere of course, you don't go fast enough in thick enough air.

So... if a spacecraft were equipped with suitably large descent engines, not unlike those found on the Apollo Lunar Landing Stage, could a craft re-enter the earth's atmosphere gently, and without the need for a heat shield at all?

I realise that the Space-X bit that comes back doesn't have a heat shield, but I assume it doesn't go high enough and drop fast enough to require one.

Short version of question: Could you bring an astronaut home from Earth orbit in a craft without a heat shield?
Yes but that would require a lot of fuel (which means they had to carry it for the whole flight, making the rocket far heavier to carry the fuel vs carrying the material to insulate the heat) to do it so they generally don't.

Craft enter the atmosphere at just below orbital speed, which for LEO is up to 18,000mph, so this explains why there's so much heat wink
If the craft is doing 18,000mph, does the seals/build of the craft have to be massively over-engineered compared to what it would face on earth, if so - how do they test it?

Smeeeeeg

32 posts

97 months

Tuesday 30th January 2018
quotequote all
GroundEffect said:
SCEtoAUX said:
Things entering the atmosphere get hot. Spacecraft have heat shields and other stuff burns up.

You don't need a heat shield to leave the atmosphere of course, you don't go fast enough in thick enough air.

So... if a spacecraft were equipped with suitably large descent engines, not unlike those found on the Apollo Lunar Landing Stage, could a craft re-enter the earth's atmosphere gently, and without the need for a heat shield at all?

I realise that the Space-X bit that comes back doesn't have a heat shield, but I assume it doesn't go high enough and drop fast enough to require one.

Short version of question: Could you bring an astronaut home from Earth orbit in a craft without a heat shield?
Yes but that would require a lot of fuel (which means they had to carry it for the whole flight, making the rocket far heavier to carry the fuel vs carrying the material to insulate the heat) to do it so they generally don't.

Craft enter the atmosphere at just below orbital speed, which for LEO is up to 18,000mph, so this explains why there's so much heat wink
The fuel problem is very important here. To slow your relatively heavy space craft travelling at quite high speed takes lots of fuel which all needs to be taken with you when you launch, as GroundEffect has said. But to launch this extra fuel you need even more fuel and so on. Fortunately the equations work out such that you don't get stuck in an infinite loop, but it does mean that you would need a very big and expensive rocket.

Couple of oblig XKCD articles which have interesting discussions around this subject:
https://what-if.xkcd.com/38/
https://what-if.xkcd.com/7/

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