All Questions
88
questions
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4
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What is acceleration due to gravity at the centre of the earth? [duplicate]
When I asked my teacher that what is the acceleration at the centre of earth, he replied that it is 0 as when we move inside the earth, the effective mass decreases i.e. the mass that exerts ...
- 592
4
votes
2
answers
2k
views
Does the Earth emit gravitational waves?
We know about Bohr's model and his vague postulate challenging Rutherford regarding discrete orbits and not emitting electromagnetic waves during this.
Extending this idea to our solar system, does ...
- 2,091
0
votes
1
answer
2k
views
Gravitational force on object inside Earth
When we find the gravitational field on an object that lies inside Earth we simplify the problem by considering the sphere whose radius is the distance of the object from the center of Earth. We use ...
-2
votes
1
answer
489
views
What will happen if rotation of Earth will get reverse? [duplicate]
Today one question pop up into my mind... What will happen if Earth spinning about its axis and around the sun will start moving in reverse direction... Whether it will affect us... What are all ...
1
vote
0
answers
27
views
Estimation of Equatorial Bulge of the Earth [duplicate]
My dynamics lecture notes repeat the Earth's equatorial bulge can be approximated as:
$$ \approx \frac{\Omega^2R}{g} \approx \frac{1}{300} $$
(Do they mean R/300?)
They also include statements like:
...
- 683
0
votes
0
answers
32
views
Gravitational potential energy on the Earth's surface [duplicate]
We assume that gravitational potential energy at a height $h$ from the Earth's surface is $mgh$. Is that accurate or only approximately correct ?
Here is my approach.
On the surface of the Earth,
$...
user174490
1
vote
1
answer
275
views
Air pressure at 500 km under sea level
Suppose you could drill a well 500 km deep without it closing in on itself, so that essentially you would have a 500 km deep hole in the ground filled with nothing but air. Also, suppose that the air ...
- 11
0
votes
0
answers
31
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What if we jump into center of the Earth? [duplicate]
What if we dug a tunnel through the center of the earth connecting the two ends (like two poles).
Suppose we have these condition in our tunnel.
1:There is no heat at all.
2:The tunnel be vacuumed (...
user176552
0
votes
1
answer
129
views
How does gravity change nearing the core in free fall? [duplicate]
The Pole to Pole Mole Hole-
If there were to somehow be a cylinder going from the North to South Poles, all the way through Earth, then what would happen halfway down (The Core). If something fell ...
-2
votes
2
answers
346
views
Will the Earth flatten out?
Since the rotation of the earth makes it more flat,due to the centrifugal forces, is it not possible for the force to completely flatten out earth into a plane ?
- 12.5k
-1
votes
3
answers
323
views
Gravitational pull of the earth
Where is the gravitational force actually present in earth? In air, in soil or is it in the deep core of earth? Well, the core seems the most probable answer out of the three. But then, gravity in ...
- 1
0
votes
4
answers
2k
views
Pressure and gravity at the center of the earth
I apologize if this sounds stupid, but as someone without a lot of physics training I was wondering...Regarding gravitational forces, since it is this that brings the dust and rocks together to form ...
- 11
0
votes
3
answers
104
views
Go deep to get light(er)? [duplicate]
I happened to look upon a section of Yakov Perelman's Physics for Entertainment, part I, the author was discussing the relation with distance from centre of earth, and the attraction.
When $d>r_{...
- 65
1
vote
0
answers
35
views
If Earth spun faster, would I be able to jump higher? [duplicate]
I'm asking mostly in relation to the forces acting on a person, but it would also be nice to know if there would be any impact on muscle strength, similar to when an astronaut goes into space.
- 11
0
votes
1
answer
250
views
Why is the weight of a constant mass different on the poles and on the equator? [duplicate]
I know of an explanation that the Earth is a inertial frame of reference since it is rotating about its own axis, and since this is happening there is a centrifugal "force" or effect which counters ...
- 332