Tagged Questions
5
votes
3answers
108 views
Is it possible to have a singularity with zero mass?
A singularity, by the definition I know, is a point in space with infinite of a property such as density.
Density is Mass/Volume.
Since the volume of a singularity is 0, then the density will thus ...
-2
votes
1answer
118 views
Suppose a hollow metal sphere filled with helium is dropped in a body of water
What are the conditions that would cause said sphere to sink or float?
What if the sphere was full of ice instead?
2
votes
1answer
115 views
Planetary Gravity and its effects
This is my first question on the Physics portion of Stack Exchange. I was hoping to get some light on the topic of gravity. I don't have much background knowledge of physics so I might as well start ...
1
vote
1answer
120 views
What is the definition of density as a function?
(Before I start, I don't know which tag is suitable for this post. Please retag my post if it bothers you.)
Let's say there is a string on $[0,1]$ with a mass given by $m(x)$. ($m(x)$ means the mass ...
0
votes
3answers
94 views
Center Of Mass Troubles
I understand the concept of Center Of Mass(com), but I am having a difficult time interpreting the equation of the simplified case of one-dimension.
The book I am reading defines the position of the ...
7
votes
2answers
934 views
'Density' of a proton
I was doing some exercises the other day, when I came across this question in my book:
A proton weighs about 1.66 x 10-24 g and has a diameter of
about 10-15 m. What is its density in g/cm3?
...
11
votes
4answers
875 views
Why does a black hole have a finite mass?
I mean besides the obvious "it has to have finite mass or it would suck up the universe." A singularity is a dimensionless point in space with infinite density, if I'm not mistaken. If something is ...
