All Questions
87
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How faster is the effect of force exerted by gravity? [duplicate]
We all know that Earth revolves around the Sun due to Gravitational force of the Sun. Also we know that it takes just over 8 minutes for the Sun's light to reach Earth.
Now let us say, hypothetically ...
- 109
1
vote
1
answer
306
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Why does earth spins? [duplicate]
I understand the governing force causing the earth's cycle around the sun is gravity. It can be described by Keplar's law. But what causes the earth's spin? what is its governing law?
- 1,975
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3k
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Does gravity change the closer you are to the Earth's core? [duplicate]
Very simple question that has bugged me for some time, does the acceleration produced by gravitation (e.g. $9.8\: \mathrm{m/s^2}$) would change if we placed an observer closer to the planet's core? I ...
1
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3
answers
9k
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Speed of the Moon
Why the motion of the Moon looks very slow in the sky? Doesn't it need the high speed in order to escape the earth's gravity?
- 4,194
4
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2
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584
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Does the Earth have a semi-solid body at its core because of lower pressure at the center of the Earth?
I have read that the Earth has a semi-solid iron body at its core, even though that object is surrounded by liquid magma.... I'm wondering if this is because of a pressure (and resulting temperature) ...
- 141
5
votes
1
answer
2k
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If the Moon had gravity as strong as the Earth's, and a magnetic field, could it have supported life?
If the Moon had gravity as strong as Earth's, and a magnetic field, could it have supported life? Because if the Moon had as much gravity as Earth, it could have retained more water than is present ...
- 163
0
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1
answer
466
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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 intensity?...
- 257
4
votes
3
answers
11k
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If the earth would stop spinning, what would happen?
What would happen if the earth would stop spinning? How much heavier would we be? I mean absolutely stop spinning. How much does the centrifugal force affect us?
If you give technical answers (please ...
- 321
5
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4
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8k
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Could we make a trebuchet that could launch objects to a stable orbit?
Inspired by this xkcd, which calculated the energy requirements for accelerating individual humans to escape velocity (regardless of consideration for what that would do to your organs), I am ...
- 3,241
5
votes
5
answers
4k
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Why doesn't the Earth release you as soon as you escape it?
I've always wondered, that since the Earth is moving at a very fast velocity around the Sun, why is it that when astronauts leave the Earth, the Earth doesn't immediately move away from them at ...
- 1,158
-3
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1
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Gravity anomaly in Lacnov, Slovakia: Gravity ashamed
http://www.youtube.com/watch?v=4qxwqNqL-Nc
http://tvnoviny.sk/sekcia/spravy/technologie/v-lacnove-sa-predmety-kotulaju-do-kopca.html
(Sorry: above links in Slovak.)
Can someone explain this to me? ...
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39
votes
5
answers
34k
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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?
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