Tidal Definition and 160 Threads

[Mentor's Note: Post moved to it's own thread] I there a tidal swell or circulatory effect in the atmosphere caused by the moons gravity ?

What is TIDAL ACCELERATION or TIDAL DECELERAION? Also, could some one please explain me it's forumlae?

In http://arxiv.org/pdf/gr-qc/0103044v5.pdf in page 6 it is written about a tidal forces on a sphere built up from test particles. It is written that ball also starts to being squashed in the horizontal directions. I do not understand this. Because gradient of gravitational force is mainly in...

Consider the following; We have Earth with two moons in orbit (discounting the existence of our own moon for the sake of this hypothetical scenario). One moon is the size and mass of Pluto, orbiting around 70,000km from Earth. The other is the size and mass of Pluto's moon, Charon, orbiting...

The weak field approximation in the Newtonian limit shows that the coordinate acceleration along a geodesic is related to the gravitational force. The geodesic deviation equation relates the coordinate acceleration between adjacent geodesics to tidal forces. If I drop 2 balls together from the...

Would an Earth-like planet while getting a tidal lock, get it influenced by landscape of surface? So that the most stable state would be to have a continent on the center of the side close to its star and the other on the exactly opposite side? Or maybe because of hydrostatic equilibrium such...

So my co-workers and I have had a dispute after hearing a podcast on NPR about Earth's rotation. One question was about what would happen if one side of the Earth always faced the sun (tidal locked) and another question was about what would happen if the Earth stopped rotating. From what I've...

Would a planet before getting a tidal lock to its star have for some transitory period days which would be centuries long? Or is there a threshold where it would just get from long days suddenly to tidal lock with everything levelling out?

I don't understand, how can tidal forces make the orbits more circular? Perhaps it has something to do with the fact that in elliptical orbits (unlike in circular orbits) the velocity is not always perpendicular to the acceleration? Or maybe it does not have to do with the tidal forces from the...

If the gravitational effect of the moon influences tidal forces on earth, doesn't that violate the 2nd law of thermodynamics? If gravity is a force and not energy, and only forms of energy can convert into other forms of energy. Then how can gravity create tidal forces, which are kinetic energy...

I can fairly understand the concept of gravity as a curvature in space time in general relativity, but so far I could not understand completely the tidal forces explained by the curvature of spacetime. When the moon is on one side of the earth, the oceans on this side come closer to the moon...

I have some 3-D model output for a river system that is tidally forced at the entrance. Right now, I'm trying to perform some linear regression on the harmonic constants of various tidal constituents at for several locations along the river compared to the observed tidal data. A linear...

Homework Statement Hey guys, I have a problem where we measured the gravity on separate floors of a building using a gravometer. It gave us values in mgals. So each floor has a distance of 0.5m. How do we take this into account as we move up and down the floors? As we move up, there's and...

Hello, I live in an area with large tides averaging 15 ft, twice daily. The city has a huge floating dock system in a large harbor held in place by fixed steel pilings. I have no idea what the weight is but it is a huge harbor housing a large fishing and personal use fleet. The docks are...

Hi! New here. Be gentle. Kinda an idea that popped into my head a little while ago: Are the tidal forces of some black holes powerful enough to separate quark groups? Google seems to be a bit iffy on the subject.

I'm struggling to get my head around tidal acceleration. I get what is IS, I know how to calculate it, but what I'm not sure is how to apply it in a way that's meaningful to me. So. If we took a stationary Earth (i.e. non rotating, tide-locked) and have the moon magically appear in orbit and...

Hello, My question is regarding effect of sun's gravity on earth. I want to know that if sun's gravity can change Earth's landscape in long duration (i.e. billion of years ) or not?? Means if Earth is dead planet and all other planets are not present in the solar system and Earth is as near...

I’ve read a bunch of post about how the universe does not exist inside, nor is, a black-hole. Still, for my question I would like to assume the universe exists within an event horizon (actually highly curved space-time, that locally, appears flat), and has a massive singularity at the...

Ok I know our moon is getting farther away due to gravity (tidal force indirect), basically giving it kinetic energy and exchanging that for orbital energy. If the moon was in retrograde orbit, i.e. Triton around Neptune, it would work the opposite way and pull the moon closer to the...

Could the formation of rings occur on a planet which is tidal locked?

Hi, I'm an intern in an energy research company and I'm asking if anyone has any links or channels to papers or studies conducted on the effects of barnacle growth or other causes of surface roughness on tidal turbines? I apologize in advance if I have posted under the wrong part of physics...

The Moon is close enough to Earth that it is tidally locked, however it is also slowly but steadily moving into a wider orbit around Earth. Will there be a point in tile when the Moon is no longer locked and able to freely rotate and if so how far apart would that need to be? Don

Not homework here but merely curiosity. I was reading that on Titan there are rivers of methane, and that at least one is 400km long. Now I was thinking about the Earth and moon; imagine that the moon becomes a copy of Earth exactly, keeps all of it's features and becomes the diameter of the...

How can I plot the tidal force vectors on the surface the Earth in Mathematica or Python? The potential energy of the tidal force on the poles are $$ U = -GM_{moon}m_{water}\left(\frac{1}{d}+\frac{x}{d_0^2}\right) $$ where ##d_0## is the distance between the moon and the Earth 384400 km. The...

Given the tidal force $$ -\alpha\left(\frac{\hat{\mathbf{d}}}{d^2}-\frac{\hat{\mathbf{d}}_0}{d_0^2}\right) $$ How is the potential of the tidal force $$ -\alpha\left(\frac{1}{d}+\frac{x}{d_0^2}\right) $$ where ##-\nabla U_{tide} = \mathbf{F}_{tide}##. Idon't see how we get the force by taking...

The fact the moon always faces us the same way fascinates me. Apparently the explanation is that our tidal bulge, and its tidal bulge "sync", which sort of makes sense. I wanted to know a bit more about this, if you guys don't mind helping a layman understand it all. Do we have evidence...

How do the “tidal forces warming moons” theories hold when [..] How do the “tidal forces warming moons” theories hold when apart from heating from expansion, there may be also cooling from contraction? I can understand a temporary heating, from the tital forces exerted on the moon but...

Is Tidal Energy a "creation" of energy? I would like to discuss very basic idea about conversion of energy. Every form of energy we utilize (solar energy, wind energy, geothermal, fossil, hydro, etc) can be traced back to the exhaustion of some kind of energy and mass. Say solar energy, it is...

Theoretically; As any mass approaching the core of a black hole, then would the tidal force difference effect the quantum level and rip apart matter? Also at the very centre of a black hole would gravity cease to exert its force since in any direction the "pull" would be equal?

Tides on Earth are described with Newton's theory of gravitation. Relativistic effects on tides theoretically become measurable on very strong gravitational fields, possibly becoming twice as strong as tides predicted by Newtonian gravity: http://adsabs.harvard.edu/abs/1983ApJ...264..620N...

We have noted (see references below) using wave and tidal energy, along the US coast as a clean energy source. This is especially feasible in places like Maine where there are very steep tidal fluctuations (I've experience them first-hand, VERRY STEEP ). So this summer they are fixing to do...

I'm world-building for a SF-story and need some help figuring out what the ocean tides would look like. My planet orbits a close binary star system; it does not have any satellites itself. The mass of the binary is 5/3 Mo [solar masses]. The orbit is closer than that of Earth and is highly...

I was thinking about (for experience, since somebody's probably already done it) making a sort of generator, with the shaft of the turbine connected to four perpendicular flat pieces. In water, waves would smash against the pieces, rotating the shaft and hopefully generating electricity. The...

How would one go about calculating the size of a tidal bulge created by the moon? I know how to calculate the gravity between two points and to calculate the attractive force of matter to the center of the Earth in the bulge you would subtract its opposite direction attraction to the matter...

As I understand it, the rate of rotation of a body is slowed as a consequence of the grater gravitational attraction on the mass displaced by tidal forces as this displacement is pulled forward by the effected bodies rotation thus acting to provide a counter rotational force until tidal lock is...

Anybody could explain me the difference between tidal forces and gravitational waves? My question emerges from the fact that gravitational waves has never been detected and also considering that tidal forces are very well understood by current physicist. Thanks AG

Why does tidal force strectechs the Earth and creates two tidal bulges, like pulling on a rubber band, instead of pulling Earth and moon together?

Since the tectonic plates ride on the convection currents in the molten mantle, I was wondering if tidal effects could create currents in the molten mantle. The reason I am asking I found this http://bowie.gsfc.nasa.gov/ggfc/tides/intro.html" where it states: This made me wonder if...

Okay, I'm nervous. I feel a bit like I'm standing in front of an auditorium and am about to make a speech... I'm a fiction writer... Wait! Don't go yet! I'm one of these hillbilies who *needs* some help! I'm working on a science fiction bit and I do believe in research. I'm always...

I'm having trouble imagining how an orbiting object would get distorted by tides --- in the first instance, say, the distortion of an initial uniform dense ball of coffee grounds (of the sort John Baez likes to imagine in his web pages). I know and understand why, if it were infalling radially...

The following diagram and approach illustrates my recent thinking and revisiting on some of the calculations for the radial tidal forces and perhaps even the "force" during a flyby. Suppose we consider a series of geodesics , all flying by our massive object M, at points a, b, c,...z on a...

Hey folks I'm learning about graviational perturbations on satellites due to planets and, mainly for now, the Moon. In the book I'm reading on this, they say that gravitational perturbations due to celestial bodies are not casued by the full gravitational attraction of them but only by the...

From another thread this question came up: What about tidal forces? Although they could be incredibly small (and I don't think anyone denies they exist) you could conceive of a test in a closed room that detects tidal forces (if it is gravity) and when it doesn't detect them it is uniform...

I got to thinking about this recently, when thinking about various proposed "renewable energy" systems based on tidal energy capture. Tidal energy is, basically, caused by the interaction of the kinetic energy of rotation of the earth/oceans, the kinetic energy of the moon's orbit, and the...

Given a black hole metric g_{\mu\nu} how does one calculate the tidal forces near the black hole horizon? Is there any more quantities that may be required to answer this?

How is Weyl Tensor associated with tidal force? I checked my book, the acceleration in tidal effect can be expressed as: ac=-RabdcZawbZd Note: Za is the tangent of geodesics, wb is the separation vector I cannot see from this equation how Weyl Tensor affects tidal force. It is...

I know that it corresponds to the 1/r^3 term in the Taylor series expansion of the gravitational force. But Taylor series expansions can't give me any physical intuition. By physical intuition, I mean that I want to know why the coefficients for the 1/r^3 term are the way they are.

I'm sure you all know what I mean by tidal dissipation function but it's... Q = \frac{2 \pi E_0}{\Delta E} and describes how much dissipation is produced. \Delta E is the energy lost over one cycle and E_0 is the peak energy stored during the cycle. So my questions are: How do we estimate...

some telecomunication satellites in orbits are made to be kept oriented in a certain way where their reception and broadcasting antenna or whatever is called should awalys face the Earth so while orbiting the satellite has to be interlocked with the surface of the earth. My question is: can the...

Suppose we have an astronaut orbiting Object X. His feet are tidally locked with it. He is close enough that there is a gravity difference between his feet and his head, say 0.3 g at his feet and -0.3 g at his head. What exactly will this feel like? What about lesser or stronger gravity differences?