All Questions
65
questions
1
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2
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680
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Accurate Equation for Earth's Gravitational Binding Energy
This is a relatively important question for anyone who can answer it. I am trying to find the equation that accurately solves for Earth's Gravitational Binding Energy. The information below is from ...
- 273
0
votes
1
answer
315
views
Finding G.P.E. of a system of particles
we want to calculate the P.E(potential energy) of a system containing 3particles p1,p2,p3.the point of observation is P.so now we should add up the P.E at P due to p1,p2,p3 to get the net potential ...
- 289
-2
votes
2
answers
217
views
Gravitational potential energy in CM frame
If the centre of mass is taken as the origin, then the gravitational potential energy of two bodies is
\begin{equation}
V=-\frac{Gm_{1}m_{2}}{(r_{1}+r_{2})}
\end{equation}
where $r_{1}$ and $r_{2}$ ...
- 158
0
votes
3
answers
499
views
How do I get the negative sign in the expression for Gravitational Potential Energy?
From universal law of gravitation, gravitational force exerted on a body of mass m by another body of mass M is
$$ \mathbf F = \frac{GMm}{x^2} $$
where x is the distance between the ...
-2
votes
1
answer
135
views
A question on Gravitational potential [closed]
For a uniform solid sphere of radius $r$ and mass $m$, if the gravitational potential on the surface is assumed to be zero, find the potential at the center.
I can't seem to figure out a way to do ...
1
vote
3
answers
1k
views
I've a problem understanding Absolute Gravitational Potential Energy?
My current concept about potential energy is that 'If work is done on a body when it is at a point (taken as zero P.E), it covers some distance. Afterward, when it is allowed to move freely it does ...
- 164
1
vote
2
answers
307
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Deriving gravitational potential energy - why is $r_0 = \infty$?
I'm wondering about some assumptions I have to make in deriving the gravitational potential energy. This arises from the following exercise:
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Since the net force acting on the satellite is ...
- 3,200
0
votes
2
answers
2k
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Getting 2 different answers when finding spring constant $k$ when gravity is involved
OK, so I've been wracking my brain for the past hour trying to figure out how to calculate k in a problem like this:
A mass of 10 kg is attached to a spring hanging from the ceiling. It is released,...
1
vote
1
answer
315
views
Finding the spring compression length for an object to reach $U = 0$ [closed]
I have a question on the following, pertaining to only parts c and d (b was shown to provide the mass of the asteroid and radius):
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I'm going to define the mass of the asteroid here as $M_A$ and ...
- 3,200
0
votes
3
answers
3k
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Is my derivation of the potential energy formula $m*g*h$ correct?
I've just wondered where the formula $E_{pot} = mgh$ you learn at school comes from so I've tried to work it out - is my reasoning correct?
The change in energy is given by
$$\Delta E=\int_{e}^{e+h}G\...
- 1,012
-1
votes
1
answer
1k
views
Gain in Potential Energy
What is the gain in the potential energy of an object of mass $m$ raised from the surface of earth to a height equal to radius $R$ of the earth?
I tried this problem in two ways and got two answers.
...
- 174
0
votes
2
answers
189
views
Finding the potential energy using a conservation of energy
The force experienced by a particle of mass $m$ in a planet's gravitational field along the z-axis, where $G$ is a constant is
$$F = -\frac{GmM}{z^2}$$
What is the potential energy corresponding ...
- 25
-1
votes
2
answers
91
views
Problem with derivation of potential enery of two body in Gravitational energy
Maybe what I'm going to ask sounds stupid but it means a lot to me that's why I'm asking. I've problem with just a single step in derivation.
Let's start. I'm keeping in mind the direction of each ...
- 27
2
votes
1
answer
1k
views
Binding energy of a galaxy?
I'm a novice in physics and new to the forms, so please forgive me if this is a dumb question or if this is in the wrong section to be posted, but how would one find the gravitational binding energy ...
- 21
2
votes
2
answers
540
views
Gravitational binding energy of 2D circle [closed]
I'm interested in calculating the gravitational binding energy for an object modelled by 2D circle for a small collision simulator.
In the simulation, I'm using a 2D equivalents of 3D properties (e.g ...
- 31