1

Physics, Astronomy & Cosmology / Re: Is time travel possible?

« on: Yesterday at 00:37:46 »

Hi all
Halc can I please just clarify your points in regards to;

All clocks are affected by these things. Atomic clocks are in no way special in this way. Paint peels slower relative to a frame in which it moves faster.

The coordinate rate of clocks can indeed be negative given a non-inertial coordinate system. Ask Mike Fontenot who seems to lose untold sleep about such things, and who has coincidentally posted for the first time in a while just a while ago.

In regards to your first point does direction of relative away/towards have any bearing, and your second point are you stating rate of atomic clocks as negative as going in reverse or just slowing down ?.
Because if negative = reverse       
are we not setting the scenario of the paint analogy going from peeling/flaking into the wind to.  returning to the painted surface becoming shiny and new then liquid in the brush/sprayer to been back in the paint tin ?

2

Geology, Palaeontology & Archaeology / Re: Can wind weather limestone?

« on: 11/04/2021 00:12:01 »

Hi all,
there is a very pure creamy white limestone from Derbyshire that has been used on a lot of iconic buildings and monuments and many thousands of war graves headstones, which on its technical data sheet states between;
 1-2 mm erosion per century
https://en.wikipedia.org/wiki/Hopton_Wood_stone

3

Physics, Astronomy & Cosmology / Re: Is time travel possible?

« on: 10/04/2021 23:52:03 »

Hi all,
so in regards to the original question, and some of the responses, are we not coming up against the laws of thermodynamics and entropy ? and arguments as to whether physical occurrences, in reality can be symmetric in time.

Yes we know atomic clocks are variously affected by relative velocity and gravitational fields strength, and can be and indeed need to calculated, but I don't believe I have seen an example of a atomic clock going backwards. 

4

Famous Scientists, Doctors and Inventors / Re: Who and How did scientists theorise the plate tectonic movement?

« on: 08/04/2021 01:04:03 »

Hi all
although not the first Wegener is still head and shoulders the main point of reference when considering continental drift/plate tectonics.
There is still active discussion around the mechanism driving the phenomena, but science has had to accept the general principle, once the weight of evidence became to compelling ie mid Atlantic ridge and the generation of new crust.
see link
https://earthobservatory.nasa.gov/features/Wegener/wegener_6.php

Quote ;
"Beginning in the mid-1950s, a series of confirming discoveries in paleomagnetism and oceanography finally convinced most scientists that continents do indeed move. Moreover, as Wegener had predicted, the movement is part of a grandscale process that causes mountain-building, earthquakes, volcanic eruptions, sea-level fluctuations, and apparent polar wandering as it rearranges Earth's geography."

In regards to the forces required Wegener stated;

"The Newton of drift theory has not yet appeared."

5

General Science / Re: Buy Spam Online for Sale USA

« on: 07/04/2021 23:47:06 »

Hi all

boppity boppity time.

Is that a medical term?

Great stuff this spam. So, do you eat it or just smear it all over??

I believe the culinary experts would recommend it as an aid for battering 
just before you deep fat fry it

Spam fritters for everybody.
wonder if they do a mars bar version ?

6

General Science / Re: Does pressure in a thermos flask affect the temperature of the water inside?

« on: 24/03/2021 00:18:44 »

Hi all,
So BC a little ray of sunshine as always, 

If n is the number of moles, and you let some of them out of the flask...
You can't readily use that formula because n changes

I believe I covered that in my first post

Yes is the short answer, you can calculate it using the ideal gas laws assuming just the drop in pressure of the steam, using
pv= nRT

I believe it would be reasonable to be able to calculate n and delta n before and after unscrewing the lid, in a controlled experiment  to the system which is the flask.

Also are you sure this is correct BC, regarding carbon dioxide ?

quote] No, it is two cobalt atoms stuck together./quote]

don't you end up with an extra c

7

General Science / Re: Does pressure in a thermos flask affect the temperature of the water inside?

« on: 23/03/2021 09:45:06 »

Hi all
BC could you expand on your question regarding (n is the number of moles ) as I’m not sure what you mean.

Here is a link to some examples similar to the sort of calculations I remember doing.
https://www.chemicool.com/examples/gas-law-calculations.html

8

General Science / Re: Does pressure in a thermos flask affect the temperature of the water inside?

« on: 23/03/2021 08:32:01 »

Hi all,
Petro I’m not sure that’s correct, I once saw a co,2 bottle blow a seal because it had been left in direct sunlight which would fit with the link to pressure and temperature as per the gas laws.

9

General Science / Re: Does pressure in a thermos flask affect the temperature of the water inside?

« on: 23/03/2021 00:38:37 »

Hi all,
Yes is the short answer, you can calculate it using the ideal gas laws assuming just the drop in pressure of the steam, using
pv= nRT
https://en.m.wikipedia.org/wiki/Ideal_gas_law
Rearrange the equation to
T =pv/nR

P is pressure in pascals
V is volume in m3
n is number of moles
R is the gas constant = 8.314 J K-1 mol-1
T is temperature in K

Is the units I was taught but I believe there are others you can use also

10

Physics, Astronomy & Cosmology / Re: Contribution of latent heat of fusion of iron at the Earth’s inner core

« on: 21/03/2021 23:41:07 »

Hi all

Can anyone do some fag-packet calculations for me please?  We know that the solid inner core of the Earth began to form about 565 million years ago.  We also know that the heat energy produced by the radioactive decay of K, U and Th is not sufficient to account for the maintenance of the temperature at the Earth’s inner core.  As the solid inner core grows, it must be releasing iron/nickel’s latent heat of fusion.  My question is:- can this release of heat to form a body-centred cubic crystals, plus the heat from radioactive decay account for the maintenance of the core’s temperature?  How much heat is currently being released from this solidification process?
We know the size of the inner core, we know it’s mass therefore, we know the latent heat of fusion of iron, we know how much heat is being lost from the core, if we assume that the rate of heat released is constant over the last 565million years, do the figures make sense?   The calculations involved of a growing sphere would fry my mind so I’d appreciate some help with this please.

I believe W Thomson AKA Lord Kelvin had a good stab at this https://en.wikipedia.org/wiki/William_Thomson,_1st_Baron_Kelvin
which would be a good starting point to the calculation, given he calculated an age for the earth due to temperature/cooling.

but as Evan-au as hinted at there is still a lot that is not known about the dynamics within the earth.

I remember reading quite a few years ago a Russian geologist concluding the majority of heat within the earth was generated by friction, which raises yet more questions.   

11

Geology, Palaeontology & Archaeology / Re: Is the earth really flat?

« on: 21/03/2021 23:20:15 »

Hi all

I am Not a FlatEarther, & i do Not support such delusionally hallucinating theories...But do remember, even a Dead Clock is Right once a day.
⏰

Twice, I believe,

In regards to the original post, consider when was the last time you replaced the battery's for your spirit level.

12

New Theories / Re: Split: Attempts to falsify relativity

« on: 21/03/2021 20:44:53 »

Hi all

In a perfectly circular orbit it is the direction that is changing and not the speed. Increasing velocity causes time dilation. In SR this would involve a straight line path and a change in speed. That is, acceleration. If the straight line path does not change speed this is inertial motion. The question becomes, does the change in direction alone make the straight line path different in its time dilation than the orbital path, if the speeds are the same. The speed of the orbit is the magnitude of an orbital an angular velocity.

Are you touching on straight lines in curved space-time
https://en.m.wikipedia.org/wiki/Geodesics_in_general_relativity

13

New Theories / Re: Split: Attempts to falsify relativity

« on: 17/03/2021 23:59:29 »

Hi all
yes thank you Kryptid that's pretty much how I understood it to be.
 

14

General Science / Re: SPAM TUB SPECIAL - The Washing Machine SPAM Service Center

« on: 17/03/2021 23:42:27 »

So my washing machine caught fire today
The good news is I was able to get my washing and drying done all in one go.

15

New Theories / Re: Split: Attempts to falsify relativity

« on: 17/03/2021 00:35:24 »

Hi all

unless things like thunderstorms and distance trains distort space-time ?

The problem is that the mechanism by which LIGO detects distortions in space caused by a passing gravitational wave is subject to detecting vibrations as well. Trains and thunder produce vibrations.

So is it not just an energy wave detector, detecting an effect from a cause ?

16

New Theories / Re: Split: Attempts to falsify relativity

« on: 13/03/2021 23:14:28 »

Hi all,

So my time is a little short at the moment and would like to pick up on a couple of points later,
I don't want to appear rude, but I don't believe this statement is totally correct.

LIGO detects the physical distortion to spacetime, and does not directly measure energy, force, or momentum.

unless things like thunderstorms and distance trains distort space-time ?

However I am certainly not making a case against GR

17

New Theories / Re: Split: Attempts to falsify relativity

« on: 13/03/2021 01:04:48 »

How does this statement not contradict gravitational waves detected and the speed attributed to them and the energy they transfer ?

Gravitational waves are not gravitational fields. The relationship between the two is like the relationship between electromagnetic waves and electromagnetic fields.

Then surely the waves that are generated that make up the field, transfer energy and momentum ?
and its the difference in this energy and momentum is what is detected by experiments such as LIGO therefore a transfer.
(cause effect )

18

New Theories / Re: Split: Attempts to falsify relativity

« on: 13/03/2021 00:30:45 »

Hi all
Halc when you stated:

Time dilation is a geometry thing, not a cause-effect thing. Gravity doesn’t travel, nor does it operate by ‘signals’. I’ve said this before.

How does this statement not contradict gravitational waves detected and the speed attributed to them and the energy they transfer ?
https://en.wikipedia.org/wiki/Gravitational_wave

19

Physics, Astronomy & Cosmology / Re: Is a unit of energy the same, no matter how it is produced?

« on: 26/02/2021 00:10:16 »

could one of the moderators not involved comment/action on the suitability of the posts in this section of the forum.

[

Others include Strangford Lough in Eire.

One day, perhaps.

I thought the turbine was working, must ask folks who sail there.

And I was thinking of a united Ireland.

And I was thinking of a united Ireland.

LOL
All this talk of hard & soft borders must have had me thinking the same way as well 
A few months ago I was seriously wondering why they don’t just join the 2 together! Other than another blood bath I suppose.

I've always been in favor of a united Ireland joining the Commonwealth. Reduced burden on the English taxpayer, in exchange for Test cricket and trading preferences. What's not to like? 

I've always been in favor of a united Ireland joining the Commonwealth. Reduced burden on the English taxpayer, in exchange for Test cricket and trading preferences. What's not to like?

Perhaps the trouble is, that some people in Northern Ireland, have deep visceral hatred of anything Irish.
If that's so, these people could never agree to become part of a United Ireland.

So. the only way a United Ireland could come about, would be this:

The Southern Irish people invade Northern Ireland. And massacre all the inhabitants.
Then the Southern Irish people move in en masse,  and entirely repopulate Northern Ireland with themselves.

That's how it used to work in Biblical times.  As will be revealed if you study the Old Testament.

However, would this work these days?

Instead of reading the bible, you could look at the facts. Northern Ireland is run by an incompetent bunch of violent criminals who are a burden on the British taxpayer and an embarrassment to democracy. The Assembly has spent more time in suspension than actually meeting since it was formed, and has only been reinstated thanks to the joint intervention of  the Dublin and Westminster governments.

The Irish Republic is rapidly emerging from a medieval theocracy into quite a pleasant place to be, where government corruption is primarily financial rather than based on violence, politicians meet and argue instead of walking away in a childish huff every year or so, the level of official incompetence is marginally less embarrassing than north of the border, and it is a burden on the EU, not the UK.   

Having done business both sides of the border for many years, I haven't noticed any significant differences between the people I deal with in either country.

As I do not believe this reflects well on the aims of this site.

20

Physics, Astronomy & Cosmology / Re: Is a unit of energy the same, no matter how it is produced?

« on: 25/02/2021 00:12:54 »

Hi all, in response to the original question, if you are in the UK,
Then BC is correct in his response's, gas bills are indeed charged in pounds sterling for each KW/hr even if your meter measures imperial volumes or metric volumes of gas used.
Also BC is also correct in stating Joules would be used in the calculation of conversion (work heat equivalence )
1 Joule/sec = 1 Watt 
below is a link as to how this is calculated and the relevant gas regulations
https://www.gov.uk/guidance/gas-meter-readings-and-bill-calculation