All Questions
62
questions
0
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121
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Which gravitational differences we would feel if the sun disappeared?
I would like to start by stating that I'm not a physicist, I'm purely a curious individual.
I've been speculating about the differences the loss of the sun's gravitational field would have on us and ...
- 247
2
votes
1
answer
72
views
Will a man acquire orbit if we suppose Earth is rotating fast enough?
if we consider that the rotation of earth is mush faster (30000km/h), so if a man standing on earth jumps 1 meter above will it acquire orbit if we ignore atmospheric friction
- 21
1
vote
2
answers
136
views
Will the moon ever proceed to lose its orbit and hit the earth?
Assume that the moon it orbiting the earth in a circular trajectory.
It will experience an acceleration directed towards the centre of the earth given by $\frac{GM}{R^2}$ where $G$ is the universal ...
- 335
0
votes
2
answers
83
views
Why can't we feel Earth's acceleration? [duplicate]
The centripetal force on Earth is constantly exposing Earth to the acceleration. Why can't we feel this change of direction?
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0
votes
1
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69
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Getting 600 n/kg when calculating the gravity for Earth [closed]
Basic Problem:
So, I'm trying to figure out how to calculate the gravitational force of the earth. I am using Desmos to graph the equation so that will explain where $x$ and $y$ come from. Whenever I ...
1
vote
0
answers
22
views
Centre of Gravity of Earth-Moon Elevator [closed]
Suppose you have a cylindrical elevator that resembles a rod of mass $m$, cross-sectional area $A$ and uniform density $\rho$, with a length $L$ spanning the distance between the Earth and the Moon. ...
- 119
1
vote
3
answers
95
views
Is Earth's surface gravity termed $g$ derived from Newton's universal law of gravity?
Trying to apply the basic Newton law $F = m a$ to a falling apple and a paper clip I encountered a problem I consider a beginner's: The fact that all objects are subject to the same acceleration ...
- 146
0
votes
1
answer
60
views
If the Earth and the Moon were smaller, would moon tides be more or less intense?
If the Earth and Moon were smaller (and everything on them too, but keeping the same average density and the same "relative" distances, I mean... the same proportions!), would the tides ...
- 11
0
votes
1
answer
319
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NASA's explanation on tidal acceleration
I've found an animation in NASA's website, illustrating tidal acceleration effect between the moon and earth.
It's the forth animation from the top in this page:
https://moon.nasa.gov/moon-in-motion/...
1
vote
3
answers
105
views
Would a projectile launched with the escape velocity reach a final velocity of 0 as time approached infinity?
I just wanted to check my understanding of escape velocity.
If a projectile was to launch and have the exact velocity as the escape velocity of the earth,
it would have a final velocity of 0 correct?
...
- 51
3
votes
1
answer
95
views
Can a pendulum at resting equilibrium position still demonstrate the Earth's rotation?
I conducted an experiment in my youth, creating a 'sand pendulum' hanging from the bedroom ceiling to a bowl of flour. I did not set the pendulum into motion, but rather wanted to see if the force of ...
- 31
2
votes
2
answers
470
views
How Newton weighed the mass of the earth without gravitational constant $G$?
I am only wondering about how Newton weighed the mass of the earth if he didn't have the value of gravitational constant $G$, so how he did it? I read about some explanations but i hadn't understand ...
6
votes
2
answers
278
views
How would a rope around Earth fall? [duplicate]
I have searched and saw a similar question but i dont know if it's exactly the same.
If I had a rope around earth, let's say a few meters above (and supposing a flat surface, and suddenly dropped it ...
0
votes
1
answer
216
views
Would the moon eventually hit the Earth?
The moon is rotating around the earth in elliptic or approximately circular orbit with speed $v$. Its acceleration have two components tangential and radial one. It is the radial acceleration ...
user230437
1
vote
1
answer
85
views
Placement of the spaceports on our Earth
Why are spaceports located at certain points (site/place) on our Earth?
Is there a physical reason I don't really know about?
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