**2.697 newtonian-gravity questions.**

It is well-known that Birkhoff's theorem and the classification of LTB spacetimes proves one version of Newton's shell theorem in the context of GR. Another statement in Newtonian gravity, often ...

I have the following question based on a paragraph from my Physics textbook (I am translating, so the result might not be the most elegant):
It states that due to the centripetal force resulting from ...

how do you calculate the tipping angle of a box? That is the maximum angle a which a box can reach before tipping over. help, please!

If there were two masses with a third exactly in the middle of those two, which way would the middle mass be pulled?

In chapter 7 of the Feynman Lectures Volume 1, Feynman explains that the Earth is round due to gravitation as everything attracts everything else. He also says that it is not an exact sphere since it ...

I've just read here that:
Equatorial radius = 6378.16 kilometers. Polar radius = 6356.78
kilometers, so the difference in circumference is 71.1 kilometers. It
is not a perfect sphere, but kind ...

When two balls of different masses are dropped from equal height, they reach the ground at the same time. Can anyone explain this in terms of physics?

I have recently read about newtons law and i dont seem to understand why G is used. what is the logic behind G?

What is difference between 9.8 N (Kgwt) and 9.8 m/s^2 (g)?
What is difference between kg weight and gravity? I am not so good in physics so please explain in a lot of detail (but sorry for this silly ...

Newtons universal law of gravitation states that
$$F=\dfrac{GMm}{d^{2}}$$
where $d$ is the distance between the center of mass of the two masses. Now a ring's center of mass is not in the ring. So ...

Imagine water striking a water wheel. We can find the torque applied by calculating the force of the water and multiplying by the distance from the center.
To calculate force, we can use the formula ...

A book, Exercises for the Feynman Lectures on Physics, has recently been published. It consists of homework problems to provide practice with the techniques and concepts used in the famous Feynman ...

Assuming that it were possible to do so, if a tunnel from one side of a planet to the other were lined with copper wire, could dropping magnets down the hole be used to generate power?

I am trying to work out the mathematics behind the design of an old mechanical brake tester. The device sits in the passenger foot well of a vehicle and tests the brake efficiency. The device is ...

I am interested in making a simplified model that represents only the effect that the moon has on Earths tides.
In this model I am going to assume that the earth is completely spherical (with no ...

I have built a ringworld calculator that gets around lack of strength by adding in a non-rotating counterweight to balance the force applied by the spinning habitable ring. For small rings with ...

I’m casually learning physics and have noticed that Newton’s law of gravitation and the electrostatic force formulas look similar. I’ve asked this question before but would really appreciate another ...

Is it possible to consider Newton's universal gravitational constant, $G$, as inverse of vacuum permittivity of mass?
$$\epsilon_m=\frac {1}{4\pi G}$$
if so, then vacuum permeability of mass will be:...

I am a newbie in water system design but I am currently faced with the exact situation below on my land, and I need to know whether gravity alone is sufficient in order to fill Tank 2 from Tank 1, as ...

Say we want to calculate the gravitational potential everywhere around(outside) a solid, circular, right cylinder.
We want to use Poisson's equation for gravity for that (Laplace(U) = -4*pi*density ...

Suppose I have an approximately rectangular prism composed entirely of folded paper. If I place 600lbs on top of these rectangular sheets of paper, the paper should compress. How does this affect ...

I have two questions.
1) The first one has to do with the formula for deriving Gravitational Potential Energy. I learned that, for the derivation of Gravitational Potential Energy given large ...

I have heard from here that stable orbits (ones that require a large amount of force to push it significantly out of it's elliptical path) can only exist in a three spatial dimensions because gravity ...

A rocket is launched vertically from the surface of the earth with an
initial velocity of 10 km/s. How far above the surface of the earth
would it go? Radius of the earth = 6400 km; g=9.8 m/s^2.
...

I'm creating a logo and want it to be as exact as possible.
The logo idea is a "Newtonian cradle", but with only 2 balls and on straight steel wire (can't be bend).
What would happen if I dropped ...

I’m very new to physics and have noticed that Newton’s law of gravitation and the electrostatic force formulas look similar. Is it possible they are related? Can the charge of particles be interpreted ...

I understand that space elevators are extremely hypothetical (bordering on pure fiction), but they are supposed to be theoretically possible.
My questions is about what longidtudes a lunar space ...

I just found a question in my textbook which asked how the period of the vertical oscillation will change if the spring and block system is moved to the moon, and the gravity due to acceleration is ...

I found an interesting problem online which has been confusing me for quite a while. Basically, two solid cubes of side length $a$ touch each other along one of their faces, and I am to find how many ...

I was hoping to get help with both a specific example and a general idea of how to do the problem.
Here's my current understanding, which may or may not be correct:
When objects are thrown from a ...

Newton's gravitational law states that
$F = G*\frac{M*m}{d^2}$
Intuitively it means that the greater the masses, the stronger the force, but it is more precise than that, it is proportional to the ...

The shell theorem states that a spherically symmetric body $S$ of mass $m$ has a gravitational field identical to that of a point particle $P$ of mass $m$ located at the center of $S$.
We can ask the ...

Newton's third law states that whenever a force acts on you, you act on it with the same force, just with an opposite direction(except it's stated a little fancier). Now if an apple is falling through ...

When a load is resting on an inclined plane, there is force $mg \sin(x)$ that's vertical to the inclined plane and force $mg \cos(x)$ horizontal to the plane acting on it like this:
My textbook says ...

I am wondering if my line of thought is correct - and thus the resulting answer to the problem above would be correct.
As we know the gravitational force (of two point masses) is given by $$F = G\...

My textbook tells me that the areal velocity of a body under central force is expressed by $\vec A$ = $r^2$$\dot\theta$$\hat k$. How can I express this in Cartesian coordinates, since the above ...

If an object, say a car, is rolling totally frictionless on a flat surface, is the gravity (perpendicular to the car's vector) still slowing it down, i.e., interfering with Newton's 1st law? Or will ...

The most general force that can fulfil the first part of Newton's Shell theorem (any spherically symmetric body affects external bodies as if its mass were concentrated at its centre) is an inverse ...

I was wondering how to prove the analog of Newton's shell theorem for 2 dimensions, in which gravity obeys an inverse-linear law. Meaning:
that an anywhere inside a circle, the gravitational field ...

I have heard this problem many times before from various sources, but I am quoting Feynman's words from his Lectures On Physics (Vol : 1) , just in case you want it to be authentic.
Therefore, ...

Feynman in second Messenger Lecture said that potential at the center of ball with small radius $a$ is equal to average potential on surface of ball minus $G$ times mass inside the ball divided by $2a$...

Gauss says that there should be no field within a hollow shell, spherical or cylindrical. But when I integrate the contributions to gravitational potential from a cylindrical shell to an off-axis ...

If gravity was the only force present would gravity, beside pulling, also stop the rotation / spin of a small object its pulling towards it over time?
What would be the effect on an uneven object and ...

Consider the following figure
where $R=\sqrt{(x-x')^2+(y-y')^2+(z-z')^2}=|\mathbf{r}-\mathbf{r}'|$ is the module of the $\mathbf{R}$ vector depends not only on the location of the $P$ point but also ...

If I hang a rope from two points that are at the same height above the ground, what is the mathematical function that describes the shape of the rope between the two points? Assuming the mass of the ...

I came across this definition of a conservative force:
"conservative force is a force which doesn't change the total mechanical energy".
So does that mean that if gravity is an external force to ...

Just as the title says, what's keeping the moon in its orbit around the earth while sun's gravity is greater, why doesn't it deviate and take an orbit (purely elliptical without moving around the ...

Asked to find the tension of a point that is halfway up a rope (where the rope has mass), given the system:
The solution of the problem (FBD included) is as follows. In this diagram (Tm = tension at ...

My friend told me if a shooter moving back at same speed of firing, so when he fires then bullet comes out of the gun and falls on the ground without hitting the target.
I am amazed by this ...

I was wondering what precisely would happen to parts detached by objects in orbit. To specify:
Let a large object of mass $m$ is in a stable orbit around a planet with mass $M$ at a distance $r$ ...

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