# Questions tagged [tidal-effect]

The force on parts of an extended body in a non-uniform gravitational field, due to residual gravitational attraction between the overall effect on the body and the expected effect on the point in question. Tidal forces are most notably in large moons orbiting near their primaries.

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### How does spaghettification work in general relativity?

Imagine a neutron star is being consumed by a black hole, so I think matter from the star is being stretched as it follows the curvature of the spacetime around the black hole. If that is the case ...
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### How can I determine the total energy and power provided by an ocean wave when it reaches shore?

When an ocean wave travels to the shoreline and breaks, how much energy is released? I did some research on finding out a formula to calculate how much energy is stored and then released by ocean ...
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### Falling stones attached by a string

Suppose we have two stones, one "big" (A) and one "small" (B), the smaller one over the big one at the moment of free fall. Suppose also that a string of a certain length is ...
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### Wouldn't Millers planet be ripped to shreds by extreme tidal forces?

If you can survive lava-like temperatures there is another issue for the well-being of Miller's planet from Interstellar. Time passes on the planet 61000 times more slowly than for an observer far ...
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### How large can a sphere of water in low earth orbit get?

Imagine that er have a large space station in low earth orbit, and inside that space station is a large sphere of water. How large can that sphere of water get before tidal forces overwhelm surface ...
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### Why would black hole rip me apart?

According to my understanding of General Relativity, gravity is not a force and an observer which is falling freely under the influence of gravity should be considered inertial. Now, I have come ...
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### Could we be sucked up entirely by a micro black hole?

The hot question about being ripped apart in a black hole (no one can deny physics is boring!) got me thinking. If you cross the event horizon of a supermassive bkack hole, nothing noticeable will ...
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### Is the gravitational tidal force equivalent to expanding space?

If you fall towards a black hole, the particles in front and the back of you, in the direction of the center, are accelerating away from you. So, seen from a freely frame, can we say that space is ...
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### Problem calculating tidal deformability in GR

everyone. I am trying to calculate tidal deformation of a neutron star (NS), only keeping linear terms like it was done in Hinderer's papers https://doi.org/10.1086/533487 and https://doi.org/10.1103/...
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### Tidal forces in daily situations: where to find it?

I'm trying to look for something that I'm not used to. My search is related to Tidal forces and the purpose is: making a qualitative explanation (@ High School level) of this phenomenon, using daily ...
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### NASA's explanation on tidal acceleration

I've found an animation in NASA's website, illustrating tidal acceleration effect between the moon and earth. It's the forth animation from the top in this page: https://moon.nasa.gov/moon-in-motion/...
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### Are there tidal forces between the solar system and the galactic centre?

Tidal forces are experienced within a system moving in free fall around a bigger object because of the different strength of gravity over the system. The difference can be calculated between the far ...
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### How does Schwarzschild spacetime bend a free falling rigid body?

How does Schwarzschild space-time bend a free falling rigid body? Will it be stretched or squeezed? How much it will be modified? Can we find an effect of Lorentz contraction? When will the assumption ...
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### More volume with more mass?

Regarding to the Schwarzschild solution, is there more volume with more mass? Lets take for example a space shuttle (spheric for simplicity) in an stationary orbit at the position $r_1$. The black ...
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### Einstein equivalence principle

I know that there are two different formulations of Einstein's equivalence principle: the weak version says that the inertial and gravitational mass are equal. On the other hand the strong version ...
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### How to compute the Ocean tidal effect by giving the lat+long for specific location on a website?

I am quite new in this and interested in computation of contribution of the Ocean tidal gravity. I am following the website (http://massloading.net/ondemand_form.html) to get the data but I want to ...
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### Could a set of rogue double planets (binary planets) be habitable due to tidal forces?

I want to write a story about rogue double planets and was wondering if it's possible to have a double planet where either both or one of the planets are habitable due to tidal forces even if the ...
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### Does a uniform gravitational field exist? Is there any acceleration in a uniform gravity field?

This question arose in the Space Exploration forum, by non-physicists, so it likely sounds naïve. The question involved the plausibility of using a very strong gravitational field to accelerate an ...
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### Can you explain tides in our water bodies with respect to Theory of General Relativity and spacetime curvature?

We read everywhere that Moon's "gravitational pull" causes tidal waves. Is there any explanation of this "gravitational pull" in terms of General Relativity and curvature of ...
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### Earth, Moon, gravitatioal pull

Does the gravitational pull that causes tides, also affect the Earth's land mass. Does it affect the atoms, molecules, is there a slight bulge to the actual Earth / Land itself?
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### Do you really die if spaghettified by a black hole?

Considering gravity acts by stretching spacetime and all forces (EM, nuclear etc...) are relative to spacetime, can we then consider that regardless of how stretched you are to an observer outside the ...
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### Weight dependency on the location on Earth relative to Sun

In this post a theoretical physicist says that one will weigh less at the point on the Earth closest to the Sun due to the Sun's gravity, which makes sense to me. But he also says that one will weigh ...
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### Can an observer in a double tidal locked system figure out it is orbiting?

Tidal locking, when the spin rate of a body matches the orbital rate so that it always faces the other body with the same side, usually occurs for just one of the bodies in orbit. However, there are ...
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### How does one calculate the tidal force in the throat of a wormhole?

If you were to attempt to open a wormhole from Earth to Alpha Centauri (4.37 LY), and its throat were to be a radius of 1m, while its mouth were to be 1.5m radius, how many newtons of force would be ...
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### Tidal Forces on a Body at a Fixed Altitude

It's a thought experiment which I've been running in my mind for long in order to understand tidal forces. Any suggestions/ideas are appreciated. Assume a perfectly spherical planet with no atmosphere....
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### What is the difference of gravity between lowest tides and highest tides?

I know tides are due to gravitional gradients so the difference of gravity between places does not need to be big in order to generate tides. Regardless, what difference are we talking about, ...
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### Why is the orbital resonance of the Galilean moons stable?

It is well known that the orbits of Ganymede, Europa and Io are in a 4:2:1 resonance. Most online sources (including but not limited to Wikipedia) say that such an orbital resonance, along with the 3:...