All Questions
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questions
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What is the locus of the velocity vectors of a spaceship moving in some distance from a black hole?
Someone with a background in mathematics and limited knowledge of physics asks the following question:
Starting from rest, a spaceship is momentarily pushed with a specific amount of kinetic energy in ...
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-2
votes
1
answer
328
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Do black holes exert infinite forces?
Black holes have infinite mass so according to Newton's law of universal gravitation should exert and infinite amount of gravity force.
- 90
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3
answers
119
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Answering simple questions about black holes to someone not knowing GR
In the Newtonian description of a black hole, it is a gravitating astrophysical object for which the escape velocity exceeds the speed of light in vacuum ($c$). But what does this actually mean for a ...
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3
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Is this definition of "escape velocity" correct? [duplicate]
According to Wikipedia:
In physics, escape velocity is the minimum speed needed for an object to escape from the gravitational influence of a massive body.
But, say, I have a spaceship in low ...
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2
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229
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Can a body ever experience acceleration this strong?
Using the Schwarzschild radius formula, I approximated the Sun's Schwarzschild radius to be $3\text{ km}$. Now assuming I have a body (not a human body) which is at a distance of $10\text{ km}$ from ...
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Force of gravity in the event horizon [closed]
I recently posted a question about black holes and gravity (this) and I discovered the Schwarzschild radius: $r_s=\frac{2GM}{c^2}$.
I thought with a friend of mine about the actual force (in Newtons) ...
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