Einstein theory of relativity

[colin hawesParticipant @colinhawes85982]

A I get older I find there are more ways of doing a job, especially after seeing this forum, which means I waste more time considering the best (i.e. easiest) way of doing something than actually working on it so a job actually takes longer and time seems to have gone faster. Colin

[DodParticipant @dod]

Posted by Roger Williams 2 on 14/02/2017 09:13:19:

Ive just reached 70 as well, bloody hell !. I asked a mate when do we finally stop looking at women and he said 97. What a relief…..

I've only 30 years to go then .

Seems like I'm a still young un compared to most of you lot

[Barnaby WildeParticipant @barnabywilde70941]

I'm in my 50's . . . & I still don't know what I want to be when I grow up

The conscious / sub-conscious workings of the brain is something that has always fascinated me, & don't start me on "time".

What I'd really like to get to the bottom of, is how my dog seems to know when I'm on my way home, despite nobody other than me knowing when that is 'cos it varies wildly from day to day. It seems to fit the pattern of when I'm actually starting the journey, 10-30mins travelling. When Molly moves to the window my missus knows I'm on my way, when she lays at the back door the missus know's I'm roughly 10mins away. Spooky or what?

[John ReeseParticipant @johnreese12848]

Just tackle a really unpleasant job. That makes time really slow down.

[Bill DawesParticipant @billdawes]

Thanks for all the interesting replies guys.

I'm 75 now, thankfully quite fit and healthy (well apart from Coeliac, Crohns, TIA, high BP, high Cholesterol)

My wife and I very often say, when discussing why all our plans of yesterday for today came to nothing, how on earth did we go out to work full time, bring up two kids with all the attendant school trips, parent evenings, parties, McDonalds, football, cricket, plus shopping, decorating, mow the lawn, washing, ironing etc etc.

No- we have got something wrong somewhere, or is it something right!

Bill D

[V8EngParticipant @v8eng]

Post removed by V8.

 

Edited By V8Eng on 15/02/2017 21:32:35

Edited By V8Eng on 15/02/2017 21:44:09

[Danny M2ZParticipant @dannym2z]

Learned as a kid.

There was a young lady from Bright
Who could travel much faster than light
She departed one day (in a relative way)
And returned the previous night

* Danny M *

[Nicholas FarrParticipant @nicholasfarr14254]

Hi, for us mere mortals, time is relatively constant here on Earth, as we grow older our body and mind slow down, so our perception of time seems to speed up. Although I still believe they slow the clocks down when you clock in at work.

Regards Nick

[JAParticipant @ja]

A colleague and I time work used to discuss how to get more hours in the day. The best suggestion was to move all the soil at the centre of the Earth to the outside so increasing the Earth's moment of inertia.

JA

[Martin KyteParticipant @martinkyte99762]

Posted by JA on 17/02/2017 09:03:08:

A colleague and I time work used to discuss how to get more hours in the day. The best suggestion was to move all the soil at the centre of the Earth to the outside so increasing the Earth's moment of inertia.

JA

How does that help?

Martin

[Jon GibbsParticipant @jongibbs59756]

Posted by Martin Kyte on 17/02/2017 09:28:47:

Posted by JA on 17/02/2017 09:03:08:

A colleague and I time work used to discuss how to get more hours in the day. The best suggestion was to move all the soil at the centre of the Earth to the outside so increasing the Earth's moment of inertia.

JA

How does that help?

I'm sure it's tongue in cheek but is alluding to the conservation of angular momentum –  I * omega.

Increasing the inertia, I = mass * r^2, will reduce omega, angular velocity – It's the same effect as the spinning ice skater extending and retracting limbs and changing rotational speed.

Trouble is that even if you could move the molten iron at the core out to the surface the gravity would collapse the whole lot in again to roughly the same inertia but I'm sure JA knows this already.

Edited By Jon Gibbs on 17/02/2017 09:43:29

Edited By Jon Gibbs on 17/02/2017 09:49:30

Edited By Jon Gibbs on 17/02/2017 09:51:38

[BWParticipant @bw]

Posted by Michael-w on 14/02/2017 09:56:18:

Posted by Martin Kyte on 14/02/2017 09:05:58:

Hi Bill

It's also interesting to note that the waking human brain has no perception of how long it had been asleep.

regards Martin

When I set my alarm for the night, I will always wake up about 5-10 minutes before it's due to go off and I don't always set it to the same time. Yet if I set no alarm, I will sleep for as long as I like.

 

Michael W

 

+1 on this, its always seemed to be a fairly odd thing to me – In my twenties I tested it by setting alarm to all sorts of strange times and unless I was totally and absolutely tired out the night before I'd usually wake up just a few minutes before the alarm.

Edited By Bill Wood 2 on 06/03/2017 08:39:31

[Frances IoMParticipant @francesiom58905]

many alarm clocks (esp the older mechanical variety but even some radio alarms did) had some form of mechanical latch which could be heard a little before the alarm was activated

[Ady1Participant @ady1]

They proved that velocity slows time thing a while back by putting atomic clocks on a jet plane and leaving the other synchronised ones on the deck

[Martin KyteParticipant @martinkyte99762]

re Bill and Jon :-

Perhaps we need to recognize the difference between elapsed time and actual time. When sleeping we do go through cycles of deep and shallow sleep so there are periods when we are conscious enough to be aware of external cues but still in a "sleep state". Even internally to the extent of being aware that "it's a Saturday and there is no work" or "today is the day I need to go to London".

Your brain chemistry will modulate your level of consciousness (sleep wake cycle) but your consciousness can record the passage of time by memory of events. When unconscious or in deep sleep we are most unaware of external events and have no notion of the passage of time. The brains body clock provides the rhythmical timekeeper to begin to bring us back out of a sleep state into wakefullness. Certainly there is a lot going on in the pre-wakefull state and it is reasonable to suggest this can accelerate or not whether we become full awake sooner. I would suggest trying to wake without putting your alarm clock on for a time when you are normally fully asleep is prone to failure.

Try asking the question the other way round. When you don't have the alarm clock on and you wake up how good are you at knowing how long you have slept before you have looked at the clock. Be aware that you get other clues like birds singing, how light it is etc. We have all certainly been startled by how late it is when we have slept in.

This is a fascinating subject and most definitely complex.

regards Martin

[Fowlers FuryParticipant @fowlersfury]

Whilst keeping the grim reaper from the workshop door, I'm NOT consoled by Freud's (paraphrased) observation:-

"If only youth knew how and age was able".

[Author]

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