[jolly]

With regards to your dc battery you have still created a circuit.
 
:why that same delay should not exist when the gravity is being destroyed?:

Why on earth are you thinking about destroying gravity?

The tides are affected by the sun, moon and earths gravity and probably by other things to- just because they follow the moon- really doesnt prove anything as if it was just the moon the tides could be larger or smaller- The other things affect the tides to- but how? does the earths gravity increase or decrease the tide- how does the sun affect it- You do not know is the answer.

[another_someone]

With regards to your dc battery you have still created a circuit.

Indeed, since you cannot have a current without a circuit (and I started by referring to a current), but I was merely stating that there was no need to include an appliance in the circuit.
 

:why that same delay should not exist when the gravity is being destroyed?:

Why on earth are you thinking about destroying gravity?

It was in response to Steven's comment about what would happen if the Sun disappeared - if the Sun instantaneously absented itself, then its gravity would also absent itself - and this whole discussion is premised on the question how long would it take for the Earth to respond to the loss of gravity brought about by the loss of the Sun.

The tides are affected by the sun, moon and earths gravity and probably by other things to- just because they follow the moon- really doesn't prove anything as if it was just the moon the tides could be larger or smaller- The other things affect the tides to- but how? does the earths gravity increase or decrease the tide- how does the sun affect it- You do not know is the answer.

As I said before - absolute proof on anything is an impossibility - one cannot even provide absolute proof that the Earth and the Sun even exist.

On the other hand, the correlation of the tides with the Moon's orbits, and that the tides are highly predictable (even the effect of the Sun and nearby planets can be calculated), that the degree of certainty in the model we have of the tides is very high indeed.

So, the answer is that we do believe we know the effect the Sun, the Earth, and the Moon has on the tides - it is not that difficult a calculation to make with modern computers.

[jolly]

1, gravity and electricity are different So why are you using an analogy about electricity to explain gravity.

"the question how long would it take for the Earth to respond to the loss of gravity brought about by the loss of the Sun."

As I said striaght away as even residual effects would not be anything compared to the others.


"So, the answer is that we do believe we know the effect the Sun, the Earth, and the Moon has on the tides - it is not that difficult a calculation to make with modern computers."

Well yeah 'believe' not know. Best assumption. As I said before- how- does the earths gravity increase or decrease the tide?- how does the sun affect it?- You do not know is the answer. you assume the answer, but dont actually know.

[Batroost]

how- does the earths gravity increase or decrease the tide?-

The tide arises because the Earth isn't flat. No hang-on that sounds stupid... What I mean is that because the Earth isn't flat it is spread out at a range of distances from both the Sun and the Moon. For example, the side of the Earth that is in daylight is (a bit) closer to the Sun than the side that is in darkness. The same applies to the sides facing and away from the Moon - much smaller than the sun but also 400 x closer.

It is this difference in gravitational pull from front-to-back that gives an imbalance in gravitation. It's a small difference (about 1/10,000,000th of the Earth's gravity) but acting on a large mobile body of water the effect is clearly measureable as a small 'bulge'. Throw in the Earth's spin and the Moon's orbit around the Earth and everything works. What complicates tide prediction is teh funnelling effects of landmasses i.e. tide heights close to land, in inlets and channels are much more varied than in open ocean.

If you want to see the maths (and it's not hard to follow) have a look at the link from:

http://www.clupeid.demon.co.uk/tides/simple.html

Best wishes,

Batroost

[jolly]

how- does the earths gravity increase or decrease the tide?-

The tide arises because the Earth isn't flat. No hang-on that sounds stupid... What I mean is that because the Earth isn't flat it is spread out at a range of distances from both the Sun and the Moon. For example, the side of the Earth that is in daylight is (a bit) closer to the Sun than the side that is in darkness. The same applies to the sides facing and away from the Moon - much smaller than the sun but also 400 x closer.

Well thats not gravity thats the shape of the earth your talking about!

It is this difference in gravitational pull from front-to-back that gives an imbalance in gravitation. It's a small difference (about 1/10,000,000th of the Earth's gravity) but acting on a large mobile body of water the effect is clearly measureable as a small 'bulge'. Throw in the Earth's spin and the Moon's orbit around the Earth and everything works. What complicates tide prediction is teh funnelling effects of landmasses i.e. tide heights close to land, in inlets and channels are much more varied than in open ocean.

If you want to see the maths (and it's not hard to follow) have a look at the link from:

http://www.clupeid.demon.co.uk/tides/simple.html

Best wishes,

Batroost

So you measure the earth gravity as a small buldge how do you know thats the earths gravity effect, I certainly wouldnt think that the earths gravity would cause a buldge- If anythink it would resitict the tides flow and size!

by the way love the link:

"The Sun also has quite a large effect, but for all practical purposes we can ignore the effects of all the other heavenly bodies".

And on the moon:

"The answer is that it's also moving sideways. As it travels sideways, which would take it away from the Earth, it also falls downwards, and the net movement keeps it at (approximately) the same distance". (not true I'm afraid its moving away!)

And on the Sun:

"Exactly the same reasoning applies to the effect of the Sun, although in this case the centre of mass is within the Sun, and the centrifugal force on the near side of the Earth is actually downward. It's no coincidence that in both cases the forces balance, because the centrifugal force is proportional to the orbital speed, which in turn is related to the mass and distance of the orbiting bodies".

(Right so if these forces balence each other then there should be no tide- as they would neutralize each other out!  Not the case is it?)

And my fav

"practical influence on the height of the tide is not included in this theory at all" Anyway.lol

[jolly]

Is'nt it About time we had a new question?

[Mjhavok]

QUESTION:DOES MIXING ALCOHOLIC DRINKS GET YOU DRUNK FASTER?

[Batroost]

Is'nt it About time we had a new question?

A new way for Trolly to say "LAST POST!"....?

[JimBob]

QUESTION:DOES MIXING ALCOHOLIC DRINKS GET YOU DRUNK FASTER?

From vast experience - NO. It is simple - alcohol (of any nature) in per second = drink in X minutes

[jolly]

surely it can- if the drinks that are mixed produce more alcohol through a chemical reaction?

And

Is'nt it About time we had a new question?

A new way for Trolly to say "LAST POST!"....?

What´s that bat, sour grapes?

[guest6180]

All I know is that...

"Beer before wine makes you feel fine, wine before beer makes you feel queer"

I don't know if there is any scientific reasoning for this but a few unintentional experiments that I have conducted seem to verify it!

[dentstudent]

If this is the right place for the question of the week, then it's a little out of date! I think there are a few who would like to contribute, but tricky when the question isn't here!

[Karen W.]

ASK the question Stuart!

[Mjhavok]

QUESTION OF THE WEEK


Q1: How can birds sit on power lines without getting electrocuted?

Q2: What is the memory capacity of the human brain?

Q3: What is the furthest object visible to the naked eye?

Q4: Why do mints make your breath feel cold?

Q5: What makes Super Glue so strong?

FIVE QUESTIONS. Enjoy!

[Karen W.]

YAYYYYYY! Thanks Steven! Good questions especially the bird one! Hummmm?

[lightarrow]

QUESTION OF THE WEEK

Q1: How can birds sit on power lines without getting electrocuted?

Because they switch off the master switch before doing it!
(Someone says it's actually because they only touch one pole of the line, but I think birds are much more intelligent).

[Spanner_Monkey]

wow I just read through this whole thread and my brain is on overload! you guys really know your stuff!

[Karen W.]

Alberto, what do you mean by, "one pole of the line,"

What is the makeup of a birds feet! Are they hollow boned in their feet also or are their feet made from something which would not conduct electricity? Are the lines safe to touch because perhaps they are coated .. Are they only dangerous when they are frayed or broken??? I am really not sure...

[paul.fr]

Karen,

when a bird sits on a power line, it is only on the one line. You will have noticed that there are two line, should the bird (be rather big and)reach other and touch the other one then it will end up at KFC (or KFB).

The bird is not completing a circuit or touching ground. This is why, when you touch a live wire you will get a shock. You are providing a ground.

[kdlynn]

and if six geese land on the top wire, break it, and fall on the second one they will also fry. and land in our parking lot at work as we are all trying to figure out why the lights went out