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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Why are there no reported experimental deviations from the Equivalence Principle due to nonhomogeneous gravitational fields?
Wikipedia says: [The assumption of? -ed] Uniformity of the gravitational field eliminates measurable tidal forces originating from a radial divergent gravitational field (e.g., the Earth) upon finite ...
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Tidal Forces vs. Einstein’s Equivalence Principle [duplicate]
The essence of Einstein’s Equivalence Principle is that in General Relativity a free falling object’s inertial frame of reference is equivalent to the inertial frame of reference of an object floating ...
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What is the meaning of the "dissipation function" $Q$ in the formula for tidal locking time?
Wikipedia gives the following formula for the time scale over which an orbiting body becomes tidally locked: $$t_\text{lock} = \frac{\omega a^6 I Q}{3 G m_p^2 k_2 R^5}.$$ The article defines each ...
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What force is the tidal force and which force is it? [closed]
1st force - Nuclear Strong Force, 2nd force - Weak Force, 3rd force - EMF, 4th force - gravity, so is this a new force? Where is the math formula to show this is a force of the universe? I didn't see ...
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If we put a floating ball at a high tide point on the ocean would it roll to low tide (assuming no friction)?
Imagine we had a perfectly floating, frictionless ball we could place on the high tide point of the ocean, per the diagram below. Would it roll to low tide? If we originally placed it at low tide ...
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Very Long Free Falling Rod
My Question Is Whenever A Rod with long height free falling horizontal It's two ends feel two different acceleration because of gravity reduce when we are at height So Point A Have Smaller ...
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Would a non-rotating perfectly spherical planet covered in water have tides?
The equilibrium tide model is the simplest Newtonian model to predict principal tidal frequency. It considers that the Moon causes tides due to gravitational differentials over Earth, creating two ...
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Time to reach singularity of a black hole after tidal forces become painful
According to Problem 2.18 in D. Raine and E. Thomas, Black Holes, third edition, for a standard observer of height two meters the infall time from the threshold of pain to death at the singularity is ...
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What if we leash the Moon? [closed]
It is understood that the Moon's kinetic energy is being chipped away at by the friction of the tides it generates with the Earth below, and that this causes its velocity to slow down and consequently ...
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How can the Moon be accelerated by a tidal pull yet see its orbit slow down? [duplicate]
The further away a moon orbits around a planet, the slower its orbit, both in angular speed and tangential speed. In the case of the moon, I am a bit confused, because due to tides, it is accelerated ...
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Could bacteria survive on a (highly contrived) neutron star? [closed]
Just a weird thought I had -- Typically, ordinary atomic matter can't withstand the conditions on the surface of a neutron star. Though heat is one obstacle, the main issue is of course the absurd ...
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Would there be tidal differences either side of a wall built through the ocean?
I'm trying to understand tidal forces. Here's a puzzle I've come up with. Suppose we build a wall which partitions the ocean north-to-south. There is no way for water to pass from one side to the ...
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How can you safely enter a black hole? [duplicate]
In a hard science fiction novel, suppose we want our heroes to enter a black hole. What laws of physics could we tweak to make it theoretically possible, albeit a technological feat?
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Turning Io into a electrical generator
Ok, so a while ago, I found out that Io's interaction with Jupiter's magnetic field produces around 3 million amperes at around 400,000 volts. if a hunk of rock can produce that much energy, that ...
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How Strong does the tidal force has to be to pull debris off a planet?
How strong do tidal forces have to be to rip stuff off of a planet? I have this question: A planet covered in loose debris with radius $r$ orbits a black hole of mass $M=1\cdot 10^{35} \text{ kg}$ in ...
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