All Questions
65
questions
-1
votes
2
answers
2k
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Potential at Center of Earth
If using the surface of the earth as a reference point how much work is needed for gravity to pull me to the center. Is it negative infinity or am I wrong? Also is a single value of potential ...
- 53
1
vote
2
answers
2k
views
Potential and kinetic energy on spherical surface
A small particle of mass $m$ is atop of a semi-sphere as shown in the figure. A little push was given to the particle. Prove that the particle will leave the spherical surface at a height of (2/3)$R$.
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- 495
2
votes
1
answer
1k
views
Gravitational binding energy and integrated potential energy not the same?
Before looking up the formula for the gravitational binding energy of a uniform sphere, I simply figured that the general formula for binding energy of an arbitrarily-shaped mass distribution would be ...
- 10.5k
1
vote
1
answer
1k
views
Calculate magnitude of force acting on some area by falling object
I have simple question: is it possible to calculate magnitude of force acting on some area by falling object?
Let's say I have an object with mass $5\text{ kg}$. I drop that object in height 1 meter....
- 139
2
votes
2
answers
557
views
Escape velocity to intersection of two gravitational fields
Find the minimal velocity needed for a meteorite of mass $m$ to get to
earth from the moon. Hint: the distance between the center of earth
and the center of moon is $\approx 60 R_E$, and the ...
- 685