What is the newest installment of 'Random Thoughts' on Physics Forums?

[fresh_42]

Granada is my region too. Kids today (anyone under 40) cannot imagine such a 1970s world.
3 TV stations that all finished by 12am or so.
Pubs that shut at 3pm and opened up again around 5.30pm, last orders 10.30pm and time at 10.45pm.
No mobiles, no PCs, no lap tops ANYWHERE. Work, home, shops, restaurants, none.
People wrote letters to each other using the post.
A take away was a chippy tea.

It was great.

 

[pinball1970]

View attachment 317972

Test card? Great. What were normal people suppose glean from that?

We had the 70s girl to take the edge off but as a kid I had no idea.

Life on Mars featured this in a way every 70s British person understood

 

[fresh_42]

Test card? Great. What were normal people suppose glean from that?

We had the 70s girl to take the edge off but as a kid I had no idea.

Life on Mars featured this in a way every 70s British person understood

I thought this was meant to adjust the central cathode-ray tube after repairing components or fine-tuning the frequencies. But why at night? I have no idea. Maybe a nationwide signal to go to bed, like the Batman signal?!

​

 

[pinball1970]

I thought this was meant to adjust the central cathode-ray tube after repairing components or fine-tuning the frequencies. But why at night? I have no idea. Maybe a nationwide signal to go to bed, like the Batman signal?!

​

When nostalgia meets a Mathematician

 

[WWGD]

What is it with these celebrities asking others to donate to their causes?
They earn way more than the average. Have them donate their own money.

 

[DrGreg]

I thought this was meant to adjust the central cathode-ray tube after repairing components or fine-tuning the frequencies. But why at night? I have no idea. Maybe a nationwide signal to go to bed, like the Batman signal?!

Yes, the purpose of the test card was to help TV engineers adjust TV sets and antenna installers position aerials. In the UK they were broadcast during daytime hours when no programmes were on air, which on BBC1 and BBC2 was most afternoons in the 1970s. Later on they were alternated with Pages From Ceefax (BBC's version of teletext).

After closedown at night I think they sometimes used to transmit a tone, for half-an-hour, to wake up any viewers who had fallen asleep and encourage them to switch off their set. The tone on audio had to be accompanied by a video signal, so they might as well use a test card.

Something that I discovered only recently was that the test card signal wasn't generated at the TV studios; it was generated at each of the transmitter sites. This was relevant as there were multiple transmissions standards in the UK: 405 lines black-and-white on VHF, and 625 lines either colour or black-and-white on UHF. Each standard had its own test card. The famous UK "Test Card F" with the picture of the girl was the colour-625 version.

• List of BBC test cards
• ETP-1 -- electronically generated test card used by ITV and C4 from 1979

 

[BillTre]

This is just fun:

 

[pinball1970]

What is it with these celebrities asking others to donate to their causes?
They earn way more than the average. Have them donate their own money.

A pet peeve of mine, especially at gigs. I did not buy a ticket to listen to some poorly crafted political sound bite from a musician.
Lilly Allen made my blood boil in one particular stunt. This is random thoughts not random rants so I will stop here.

 

[WWGD]

A pet peeve of mine, especially at gigs. I did not buy a ticket to listen to some poorly crafted political sound bite from a musician.
Lilly Allen made my blood boil in one particular stunt. This is random thoughts not random rants so I will stop here.

If I may, this goes for all sides:

 

[pinball1970]

Very emotional watching the world cup national anthems. Just watched Korea and Portugal.
It's great and more than football, its competing then shaking hands. One of the few things we do as humans that is overwhelmingly good.
Totally happy being a hopeless optimistic hippie in this scenario, it's once every 4 years.

 

[kyphysics]

Why don't restaurant entree salads usually give you the choice of two sides the non-salad entrees do?

The price of an entree salad is sometimes more than a non-salad entree. E.g., you might see a chicken house salad cost $14.99, while a cheeseburger with two sides costs $12.99.

 

[Astronuc]

PSA - Don't drive stupid!

C7 Corvette Ejected Its Whole Engine in a Highway Crash
https://www.yahoo.com/autos/c7-corvette-ejected-whole-engine-175000459.html

In another story, a couple of teenagers were arrested after racing at 130 mph on I-93 in New Hampshire.

 

[WWGD]

Is there a straightforward proof that a line joining two points in a plane lies fully in the plane? We can crank it out, find the general coefficients of the points and show they satisfy the equation. I assume there may be a simpler one, since this is a feature of linear objects.

 

[nuuskur]

PSA - Don't drive stupid!

C7 Corvette Ejected Its Whole Engine in a Highway Crash
https://www.yahoo.com/autos/c7-corvette-ejected-whole-engine-175000459.html

In another story, a couple of teenagers were arrested after racing at 130 mph on I-93 in New Hampshire.

This is why I can't stand people not following the laws of the road. Racing is fine .. at the (god damn) track designed for it!

Not too long ago here as well, a young dude needed to test the limits of his 300 something kW engine on a freeway - the car is totalled, afaik he survived.

Is there a straightforward proof that a line joining two points in a plane lies fully in the plane? We can crank it out, find the general coefficients of the points and show they satisfy the equation. I assume there may be a simpler one, since this is a feature of linear objects.

We take $Ax + By + Cz + D = 0$ and $P_1\neq P_2$ on the plane. It is straightforward to check that $\lambda P_1 + (1-\lambda)P_2$ lies on the plane for any $\lambda \in (0,1)$. Can rewrite this in some equivalent notation, but that's the most straightforward solution I can think of.

Perhaps, you meant the line that is determined by two points, I'm not sure. In general, we pick a point $P_0$ in space and a nonzero vector $n$ (the normal vector of the plane) and require that $\langle n, P_0X \rangle = 0$ for any point $X$, where $P_0X$ denotes the vector determined by the two points.

Now, pick two points $P_1\neq P_2$ such that $\langle n, P_0P_1 \rangle = \langle n, P_0P_2 \rangle = 0$. E.g take the parametrised representation of the line that goes through $P_1$ and $P_2$, it is again straightforward to check that any point on the line satisfies the plane equation.

A special case of this is the plane $z=0$. Roughly speaking, it doesn't matter how the plane is positioned relative to some "observer". The properties of linear objects are invariant (and not just linear objects).

edit: I should mention that this is valid for euclidean geometry.

 

[Rive]

Here, almost every English lesson starts with the explanation of the common greeting of 'how are you?/fine, thanks' pair. This lesson often repeated monthly.
Futile effort. Here, this question is asked only if you expect a serious, long answer: a joint rumbling about politics, economy, job, health, life in general, family, pets, car: everything.

So, culture shock: a double one. One side just can't understand why is the other one fleeing just after a few sentences? And the other side is confused that how could he trigger a tirade with just a simple greeting?

Well, sitting in an open floor office and listening to the phone calls around can be quite funny sometimes

 

[pinball1970]

PSA - Don't drive stupid!

C7 Corvette Ejected Its Whole Engine in a Highway Crash
https://www.yahoo.com/autos/c7-corvette-ejected-whole-engine-175000459.html

In another story, a couple of teenagers were arrested after racing at 130 mph on I-93 in New Hampshire.

This made the headlines in August this year.

https://metro.co.uk/2022/08/22/one-...esla-and-landed-on-tube-rail-tracks-17222179/

The speed the car was doing (not motorway / free way) where it ended up, what state it was in and the fact it was all caught on CCTV made it more shocking.

One woman died at the scene, I could not find follow up on the other passengers that survived initially.

 

[pinball1970]

Here, almost every English lesson starts with the explanation of the common greeting of 'how are you?/fine, thanks' pair. This lesson often repeated monthly.
Futile effort. Here, this question is asked only if you expect a serious, long answer: a joint rumbling about politics, economy, job, health, life in general, family, pets, car: everything.

So, culture shock: a double one. One side just can't understand why is the other one fleeing just after a few sentences? And the other side is confused that how could he trigger a tirade with just a simple greeting?

Well, sitting in an open floor office and listening to the phone calls around can be quite funny sometimes

You are right, in the UK, “how are you” means “hello,” most of the time.

In fact, that is more what I would call text book English greeting, I rarely actually hear it said like that.

“You good?” You alright?” “how you doing?” All really mean hello.

Replies are, “Good ta/Great thanks/Ok cheers.”

“Good weekend?” From a colleague Monday morning, does not mean, “Did you have a good weekend? Please tell me about it.”

I really want the answer, “Yes ta/Great yeah etc,” not anything else including, “No.”

 

[Astronuc]

I don't know if this is worthy of a separate, but I find universities encouraging gambling/sport betting to be appalling.

'You freakin' idiots': Dave Ramsey just blasted US universities for promoting online gambling to students — and reaping millions in fees. Why young people are the perfect prey​

https://www.yahoo.com/finance/news/freakin-idiots-dave-ramsey-just-140000783.html

Sports betting is surging across America — with flashy ads and easily accessible apps encouraging wagers both at home and in stadiums — and has slinked its way over to several college campuses as well.

The New York Times recently uncovered that at least eight universities have partnered with online sports-betting companies, while at least a dozen athletic departments and booster clubs have signed agreements with brick-and-mortar casinos.

Personal finance author and radio host Dave Ramsey lambasted the institutions on The Ramsey Show.

“You freakin’ idiots … Selling out your own students who you’re supposed to be caring for,” said Ramsey. “The No. 2 addiction in North America today — and fastest growing addiction in North America today — is online gambling. It starts with the sports betting as a gateway drug.”

 

[Borg]

Unfortunately, once they've gotten in, it's nearly impossible to get rid of them. From what I remember, the state of Maryland put statewide gambling up for a vote 5 times before it was finally passed. Interestingly, there haven't been any votes to rescind it since then. Now there is a constant barrage of gambling commercials on DC stations.

 

[WWGD]

I know someone from Malta. Total area is 122 sq mi, and main island is 62 sq mi. So , approximating as 8x8, two points on the islsnd are never farther than $\sqrt {8^2+ 8^2}$ 12 miles apart. And you're never more than 4 miles from the sea. More so on the smaller islands. Seems strange.

 

[WWGD]

What's with these gifts of TV sets, general electronics that require you to pay a $1 or nominal fee to claim your gift? Are these necessarily scams? I haven't tried to claim any such, just curious.

 

[Bystander]

What's with these gifts of TV sets

"Turn on the green light. The man wants a green suit."

 

[Borg]

What's with these gifts of TV sets, general electronics that require you to pay a $1 or nominal fee to claim your gift? Are these necessarily scams? I haven't tried to claim any such, just curious.

Yes, that sounds like a scam. I'm guessing that they want you to pay using your checking account or some other type of personal account? Once they have that information, there's nothing stopping them from charging much more than a dollar and clean out your account.

 

[WWGD]

Wow, reading about Robert Wadlow, worlds tallest (recorded, I guess) man, at 8'11''. Wonder how much more food he needed than the average person. Thousands in a lifetime. Though he died at 22, in 1940.

 

[Bystander]

Just got Scott Adams' latest, Not Remotely Working, this a-noon and AI has a loonnngggg way to go far as proofreading flyleaf/jacket text; "...supply CHANGE...."

 

[Bystander]

Just got Scott Adams' latest, Not Remotely Working, this a-noon and AI has a loonnngggg way to go far as proofreading flyleaf/jacket text; "...supply CHANGE...."

p.132, third daily, "...supply chain...."

 

[WWGD]

p.132, third daily, "...supply chain...."

Change you CAn't believe in.

 

[WWGD]

The Taga in Siberia changed its name when Sylvester Stallone moved there. He's currently the i of the Taiga.

 

[WWGD]

When I'm hungry, 'workshops' sounds like 'pork chops'. If I'm thirsty, Friedrich ( As in Carl Friedrich Gauss) sounds like ' Free drink'.

 

[Borg]

I'm a bit underwhelmed with the news stories about the fusion "breakthrough". It's great that they got more power out of the system than they put in but it's nothing close to the power that they used. The lasers are very inefficient and require much more energy than they deliver. All of the news stories are only comparing the delivered energy to the energy received from the fusion reaction. If you compare the total power used to the output, there is still a long way to go.

 

[Tom.G]

there is still a long way to go.

Agreed.
Perhaps it should/could be considered as a "Proof Of Concept."
After all, that is what the Wright Brothers supplied.

 

[WWGD]

This guy telling me how he survived back in the 70s, in San Diego, by sleeping in his car and making enough for basic expenses ( he did have a job )by recycling cans, which were $0.02 each, and two for $0.05. I doubt the whole can-recycle can do little but barely break even. His total of all such monthly expenses was $150, according to him.You need to travel to several source areas, then drive to the recycling center, you will likely have some competition, etc. It was an interesting story, but not too believable, so I let it slide.
Nowadays, though, with several cars, sleeping in a car may be, other than the whole bathroom thing, more comfortable than doing so at an apartment.

 

[Borg]

I've always found that the best way to save money is to stay educated and earn more of it.

 

[WWGD]

I've always found that the best way to save money is to stay educated and earn more of it.

Sure. Just that I doubt you can break even at all. I see people walking around with bags full of cans, and it seems like a fool's errand.

 

[WWGD]

Here's an interesting bit from Glassdoor: