All Questions
Tagged with newtonian-gravity reference-frames
228
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Simple Analytical mechanics problem [closed]
I am trying to solve a simple problem stated as follows:
"There are two cartesian reference frames k $(o;x,y,z)$ and K $(O;X,Y,Z)$ with the first one being still (inertial) and the second one (K)...
0
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1
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Circular motion of planet around star
The question says that the planet moves in a circular orbit around the massive star. But the graph says that velocity of the star wrt the COM of star-planet system varies with time. But my confusion ...
- 74
7
votes
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Are orbital eccentricities in a binary system always the same?
Some excercises on Kepler laws and binary system use this relation $$\frac{r_1}{r_2} = \frac{a_1}{a_2},$$
where $r$ is the distance from the center of mass to each object and $a$ is the semi-major ...
- 133
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Separate the rotational acceleration from the gravity
I tried to plot the magnetometer and accelerometer readings: Fig1 and Fig2, respectively. The readings were collected by rotating the sensors around x,y,z axes. As you can see, the mag readings (Fig1) ...
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Where would the centre of gravity be for 4D shapes?
Say, hypothetically, we took a hypersphere where would the centre of gravity be for such an object.
- 124
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3
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What exactly will happen if you jump in the upward direction from a roof of on a moving car?
I'm not a physicist and I'm a little bit puzzled with the image below:
I know it's a joke but if we assume we don't have air resistance what exactly will happen if someone jump in the upward ...
- 13
1
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1
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79
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How does Lagrange point $L_2$ provide even meta-stability if centrifugal force isn't real?
I recall hearing, perhaps colloquially, that a centrifugal force doesn't exist. It can be mistakenly felt but, it is not a real force. Given this, how does the $L_2$ orbital point exist beyond the ...
- 460
2
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224
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Gravitational forces of a building
In trying to understand the gravitational forces of a building, I have devised a thought experiment:
A building is floating in space. The building's mass is asymmetrically distributed. Inside it also ...
- 1,153
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378
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Why do the 2 planets in a two-planet system orbit around the center of mass?
When reading the Feynman Lectures (chapter 7, volume 1), Feynman was explaining the formation of tides on the Earth and said the following:
The moon does not just go around the earth, the earth and ...
- 87
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112
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What is the intuition behind excluding the effect of gravity from accelerometer data
In the unit of accelerometer and linear acceleration, I see that accelerometer is angular and the linear acceleration is linear. There is the impact of gravity on the accelerometer. However, ...
- 109
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Can the apparent weight in a elevator accelerating downwards be compared to that of body submerged in a fluid
Can the apparent weight of a person ( here I mean what a weighing scale would read if that person were to stand on it ) in a elevator going downwards( NOTE: the acceleration is less than the ...
- 801
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96
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How can this contradiction be avoided and be corrected?
Suppose we have a situation with a massive planet and a rocket is sent from a height $h$ with speed $v$ greater than escape speed. Now initial angular momentum is finite as $mvh$, but as we know it ...
- 512
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2
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39
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Apparent weight in diurnal motion
An object of mass $m$ is on the equatorial plane. Now it is moving in a circle of radius equal to the radius of earth $R$. The object is moving with angular acceleration $\omega$. Let us observe from ...
- 1,179
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3
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579
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Two particles rotating about their center of mass
Two bodies each of mass $m$ are rotating about their center of mass where the radius is $r$.
Here centripetal force of each body is $\frac{mv^2}{r}$ where $v$ is the linear speed. Now, gravitational ...
- 1,179
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What happens to a person in an elevator with a downward acceleration greater than $g$?
So I've been learning about the apparent weight of a person in an elevator accelerating upwards or downwards. I learnt that:
If it accelerates upwards with an acceleration a, Apparent weight = m (g+a)...
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