# Questions tagged [gravitational-force]

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### Joseph Weber's aluminum cylinder

Joseph Weber used a massive aluminum cylinder and measured its deformation, in his attempt to detect gravitational waves. Why did he choose aluminium? Would a solid diamond deform as much as solid ...
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### Does the escape velocity formula take into account how a gravitationally bound object's distance to its primary increases before coming back down?

Confusing title, I know. Imagine a perfect, homogenous sphere with an exact radius of $1,000 \text{km}$ and an exact mass of $8 \times 10^{15} \text{kg}$. If you use the formula for escape velocity \$...
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### What is the force responsible for the output of whiteholes?

When we think of black holes and big celestial objects we think of objects being pulled towards them with a strong force. And that force turns out to be the gravitational force but then for the theory ...
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### BH rotating at maximum speed and extremal BH

Academic problem: What should be the rotational speed of a planet at the equator such as there is no surface gravity? Plugging centripetal force=gravitational force... $$mv^2/R=GMm/R^2$$ we get, ...