All Questions
Tagged with earth homework-and-exercises
74
questions
6
votes
4
answers
3k
views
If you could ride an elevator through the earth [duplicate]
What if it was possible to ride an elevator straight through earth. If we take all the heat and pressure problems away, and assume it would be possible: What would happen with gravity? Would gravity ...
8
votes
4
answers
12k
views
Effect on length of day as the polar ice caps melt
If the polar ice caps of the Earth melt, how will the length of the day be affected?
- 247
0
votes
0
answers
623
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Gravity change as a function of time only [duplicate]
Is it possible to find how gravity changes with time? That is, height is not part of the equation.
For example, $g$ can be expressed as a function of height that does not involve time with this ...
- 321
8
votes
2
answers
9k
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How is the Earth heated by a Full Moon?
While the moon is certainly not a good reflector of solar radiation, surely the radiation it reflects back heats the Earth (even if it is a terribly small amount).
How would one go about calculating (...
user28754
-1
votes
2
answers
6k
views
Finding the period of an infinite length pendulum [closed]
What would be the period of a pendulum with an infinite length, assuming a non-rotating Earth? The answer is not infinity.
- 189
1
vote
1
answer
665
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How would a very nearby supernova shockwave and remnants affect the Earth?
I've been reading about supernovae for a while, and I noticed how incredibly fast their shockwave and remnants travel shortly after the explosion. So I thought about how this would affect the earth if ...
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-1
votes
1
answer
2k
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Calculation of 12000 Lunar Orbits/Earth Day [closed]
I am really interested in the calculation of the following speed value in meter-per-second unit:
Speed of something that is able to travel in one earth day the distance that it would take for the ...
7
votes
1
answer
2k
views
How much negative charge do I accumulate by touching the earth?
The Earth carries a negative electric charge of roughly 500 thousand Coulombs (according to different sources I've seen). If I touch the Earth I should therefore pick up some of this electric charge (...
- 79
0
votes
2
answers
5k
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How small the Earth should be for it to become a black hole? [closed]
How small would the earth have to be squashed so that it would become a black hole?
- 598
0
votes
1
answer
168
views
How much energy is needed to curve the space so the Sun will come 1 meter closer to our planet? [closed]
How much energy/work will it take if our planet is:
5.9736×1024 kg
or
3.0×10−6 Suns
to move Sun and Earth 1 meter closer ...
- 604
2
votes
1
answer
2k
views
Application of diffraction problem!
Here is a problem that I am working on, which is the applying the concepts of diffraction to the setting of the sun:
Air has a small, usually negligible index of refraction. It is 1.0002926. This ...
- 25
5
votes
3
answers
17k
views
Does Earth's Rotation Affect Its Shape?
The question I am working on is, "Consider the following.
(a) Find the angular speed of Earth's rotation about its axis. rad/s
(b) How does this rotation affect the shape of Earth?"
I am ...
- 453
0
votes
1
answer
2k
views
Deducing latitude from Foucault Pendulum
Suppose I set up a Foucault pendulum and observe that it precesses at a rate of 216.528 degrees per day. While I am observing this, a total solar eclipse occurs. Where am I, and what is the date?
My ...
- 751
1
vote
0
answers
190
views
How far is the horizon, if a 2m tall man watches to the sea?
How far is the horizon, if a $r=2 m$ tall man watches to the sea?
I have calculated that it would be even just about 6 km. if R = radius of earth( $6370 \cdot10^3$ m ).
By pythagorean theorem we get....
- 735