- #1
omiros
- 30
- 0
This isn't a homework problem, but something that has being buzzing in my head.
I've been thinking about it cause at huge distances from Earth g changes and also in what happens for really dense objected and small things could change too.
The real equation for gravity no matter which body we are talking about with a spherical symmetry, is Fg=GmM1M2/(r+s)2,
with r = the radius of the main body and s = the distance of the body from the surface of the other one.
Let's consider M1the main one and M2the one that can be viewed as a particle. We know that ΔK = -∫s0Fds , however the force is chaning all through the 'free fall' and makes things more complicated.
The solution that I find is Fg=GmM1M2s/(r2+rs)
Where do I need the help?
I don't know if this is the right solution and I also don't know how to interprete the limiting cases, like limr→0 and lims→0 at the same time(in the center).
What are all the 3 different equations that describe the variance of the force?
Also could someone transform the energy equations if both bodies are 'big' but with different radius(not same r or mass)?
What energy do they have before they collide?
What would happen if they were like earth? (not spherical, with equations)
I've been thinking about it cause at huge distances from Earth g changes and also in what happens for really dense objected and small things could change too.
The real equation for gravity no matter which body we are talking about with a spherical symmetry, is Fg=GmM1M2/(r+s)2,
with r = the radius of the main body and s = the distance of the body from the surface of the other one.
Let's consider M1the main one and M2the one that can be viewed as a particle. We know that ΔK = -∫s0Fds , however the force is chaning all through the 'free fall' and makes things more complicated.
The solution that I find is Fg=GmM1M2s/(r2+rs)
Where do I need the help?
I don't know if this is the right solution and I also don't know how to interprete the limiting cases, like limr→0 and lims→0 at the same time(in the center).
What are all the 3 different equations that describe the variance of the force?
Also could someone transform the energy equations if both bodies are 'big' but with different radius(not same r or mass)?
What energy do they have before they collide?
What would happen if they were like earth? (not spherical, with equations)