Whats wrong with Gravity?

[Pommie]

I thought GPS satellites did about 10,000Kph.

Mike.

 

[Roff]

1 s / sqrt (1 - (4 000km/s^2)/(300 000km/s^2)

sooo new t = 1.00000889s

so in a day that's : 7.68s

The OP is wrong...as one would expect.

v = 4*10^3 (4km/s, not 4000km/sec)
c = 3*10^8
v^2/c^2 = 1.78*10^-10
1-v^2/c^2 = 0.999999999822
sqrt(0.999999999822) = 0.999999999911
1/0.999999999911 = 1.000000000089
0.000000000089*60*60*24 equates to 7.68 microseconds per day.

 

[birdman0_o]

I'm embarrassed, going to bed.

Who knows where the OP got 10 minutes from....sigh

 

[tcmtech]

I'm surprised that the obvious question hasn't been asked, "Does a satellite rust faster on the ground with the battery (+) connected to the hull vs one in space with the battery (-) connected to the hull?"

I know somebody you could ask!
(By the way I hope your satellite doesn't have any rust on it.)

You made me laugh.


one equation and the answers range from 87.27 seconds to 12.97 minutes down to 7.68 micro seconds!
Now is this the final answer?

I'm embarrassed, going to bed.

birdman you made my day!
Are you my old math teacher in disguise?

You made me laugh even harder!

 

[tytower]

No doubt you are all experts in quantum physics . You know that's the one where the probability of white being black has been proved to be about 99.99%.

Now instead of dicking around why don't you google up the title and look for the TV show. It was on night before last in Australia , it is presented by a guy who heads that new particle bombardment ring they built in sweden ? was it . https://public.web.cern.ch/public/en/LHC/LHC-en.html

I would like to know whether this statement by the GPS yanks has any merit or not.
Stop knocking me and get on with learning a bit .
Importantly get to the TV show and watch it if you have the bandwith . Then criticise all you want .
Its a legitimate question.

 

[3v0]

Watched a TV show called this last night.
Fella presenting claimed a Particle Physics Doctorship
Reckoned GPS has to be adjusted periodically because the clocks on board the satellites run faster with the lesser gravity.
...
He passed over it very quickly claiming it was 10 minutes a day! Now he was at a US Airforce base with no airstrip which specialised in GPS for the military.
...
Thanks IA

google gps satellite time dilation

Wikipedia

The effect of gravitational frequency shift on the GPS system is due to General Relativity, which states that a clock closer to a massive object will be slower than a clock farther away. Applied to the GPS system, the receivers are much closer to Earth than the satellites, causing the GPS clocks to appear faster by a factor of 5×10^(-10), or about 45 μs/day. Gravitational frequency shift is also a noticeable effect.
Combining the time dilation and gravitational frequency shift, clocks on the GPS satellites tick approximately 38 μs/day faster than clocks on the ground or in GPS receivers.​

 

[mramos1]

1 s / sqrt (1 - (4 000km/s^2)/(300 000km/s^2)

sooo new t = 1.00000889s

so in a day that's : 7.68s

The OP is wrong...as one would expect.

Must be TCM's old math teacher, I do not see any triangles or letters in this one.

Had some good laughs here.

 

[tytower]

3v0 One of your better posts .That was useful .
I wonder a little though when they say

The engineers who designed the GPS system included these relativistic effects when they designed and deployed the system. For example, to counteract the General Relativistic effect once on orbit, they slowed down the ticking frequency of the atomic clocks before they were launched so that once they were in their proper orbit stations their clocks would appear to tick at the correct rate as compared to the reference atomic clocks at the GPS ground stations. Further, each GPS receiver has built into it a microcomputer that (among other things) performs the necessary relativistic calculations when determining the user's location.

So they either have to keep adjusting their clocks as they claimed or the above was applied before launch . I wonder which?

 

[3v0]

3v0 One of your better posts .That was useful .

Beauty is in the eye of the beholder. I expect the same holds for the quality of posts. The post where I used crashsite's physics to show how to make antigravity work was much better.

I wonder a little though when they say

So they either have to keep adjusting their clocks as they claimed or the above was applied before launch . I wonder which?

Time keeping is not exact even with atomic clocks.

Offical time on earth is not determined by one atomic clock but the average of several. This is because atomic clocks do not keep perfect time. They are just the best we have.

The atomic clocks in orbit were adjusted for some ideal orbit. I expect satellites are not always in their ideal orbits. I am not sure if the orbital variance is enough to effect the GPS system, but in terms of time it is factor.

These were the easy ones, there could be additional factors. So it is not supervising that some fine time adjustment is needed in GPS receivers.

3v0

 

[birdman0_o]

Further, each GPS receiver has built into it a microcomputer that (among other things) performs the necessary relativistic calculations when determining the user's location.

I thought the satellite just told the receiver where IT was , not the other way around, I can't imagine each one processing millions of signals??

 

[Roff]

I thought the satellite just told the receiver where IT was , ...

I think that's what he said.

 

[birdman0_o]

I don't think so, I wonder what his reference is....probably his friends LOL

 

[Roff]

I don't think so, I wonder what his reference is....probably his friends LOL

The receivers he was referring to are those in the hands (vehicles, etc.) of users on the ground. They don't have to transmit anything back to the satellite, and the quote didn't read that way to me.

 

[birdman0_o]

You are right. So I can't do Math or read English

This thread is making me feel terribly stupid.

 

[Roff]

You are right. So I can't do Math or read English

This thread is making me feel terribly stupid.

Bedtime for birdman again.

Me too.

 

[Boncuk]

Pillepalle, fast or slow clocks.

Women look at gravity from another point of view. It forces them to wear bras.

 

[birdman0_o]

Pillepalle, fast or slow clocks.

Women look at gravity from another point of view. It forces them to wear bras.

And forces old men to wear underwear

 

[Roff]

And forces old men to wear underwear

I'm old now, but I've worn underwear all my life, primarily for protection from errant zippers.

 

[3v0]

And forces old men to wear underwear

LOL....

In time gravity will get us all.

3v0

 

[mramos1]

Roff and 3v0,

Yep, his day will come. He can count on it.