Tagged Questions
3
votes
2answers
65 views
Orbits within a $-\vec{r}$ field
Let's say that we have a cold dark matter theory, so we imagine weakly interacting particles. Now, let's say that one of those dark-matter particles has a rare interaction while traveling through the ...
0
votes
1answer
94 views
Effect on mass of Earth if it stops revolving around Sun
If the object in motion gains mass, will it affect the change in mass of Earth if it stops revolving around Sun, since mass is responsible for gravity how will be the gravitational force change?
2
votes
1answer
125 views
How does one measure Earth's speed of revolution around the sun?
I know that there are several formulae that one can plug numbers into to arrive an estimate of Earth's speed around the sun (Kepler's third law for instance), but I'm wondering how these things are ...
-1
votes
3answers
171 views
Escape velocity from Earth
We know the escape velocity from the Earth is 11.2km/s. Isn't it the velocity required to escape from earth if we go normal to the surface of earth? i.e while we derive the formula for the escape ...
1
vote
1answer
170 views
Result of increasing the radius of earth?
How can increasing the radius of earth may cause an impact on the solar system ? Like, would earth may start making a bigger orbit (due to increase in size and wait) or vice versa ? or else ?
PS: The ...
6
votes
2answers
150 views
Is it possible to use a balloon to float so high in the atmosphere that you can be gravitationally pulled towards a satellite?
A recent joke on the comedy panel show 8 out of 10 cats prompted this question. I'm pretty sure the answer's no, but hopefully someone can surprise me.
If you put a person in a balloon, such that ...
0
votes
1answer
108 views
What is the gravity at the center of the Earth? [duplicate]
Possible Duplicate:
Would you be weightless at the center of the Earth?
Supposing there is a cavity at the center of the Earth, what is the gravity there? What will be its direction and ...
1
vote
1answer
111 views
How can the properties of the Earth be determined?
How can the properties of the Earth be determined? And how is the gravitational constant then determined from them?
A satellite can determine the G.M.. But, how they are individually determined ...
-4
votes
1answer
6k views
What is the extent of Earth's gravitational pull?
Where the gravitational pull of Earth exist up to?
What distance from Earth it will be zero?
How do the skydivers fly at a same altitude?
Won't they feel gravitational pull?
What is the Earth's ...
16
votes
8answers
13k views
Why doesn't the Moon fall upon Earth?
Why doesn't the Moon, or for that matter anything rotating another larger body, ever fall into the larger body?
18
votes
4answers
1k views
Would you be weightless at the center of the Earth?
If you could travel to the center of the Earth (or any planet), would you be weightless there?
