Questions tagged [earth]

Earth is the planet on which we live, the 3rd planet from the Sun. Questions using this tag should be about Earth the planet and not Earth-like planets nor earth, as in dirt or soil.

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190 views

By how much does starlight heat the Earth?

According to this, the stars in the night sky have a cumulative magnitude of -6.5. This is very dim, so I expect the heat generated to be tiny, but I'm wondering how tiny. Moonlight does measurably ...
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42 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 ...
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Had the centrifugal force of the rotation of Earth in the past forced liquid, hot Pangea to be positioned near the Equator?

Had the centrifugal force of the rotation of Earth in the past forced liquid, hot Pangea to be positioned near the Equator? Maybe also a question for 'GSE' but if we deal with centrifugal forces and ...
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Can Earth's Magnetic Field Be as Less as -85μT and as Much as +70.46μT?

What did create the question? I was analyzing a data set where the researchers have used objective data. They have calculated earth's magnetic field through sensors and that research was conducted in ...
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39 views

Ocean warming by induced electric current for wandering magnetic poles?

In a post on the co-rotation of Earth and its magnetic field (Does the geomagnetic field rotate?), John Rennie raised the point that, if Earth's magnetic field were rotating about its dipole axis, it ...
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Being the Earth modelized as a big magnet (or solenoid), which would be the field intensity of such a model inside the solenoid or magnet axis?

This question has arisen from the Carl Friedrich Gauss’ statement that the Earth could be modeled, concerning his calculations about the earth’s magnetic potential, as a big magnet, himself having ...
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308 views

Estimating the Pressure of Earth's Center

The pressure of a medium of density $\rho$ and in a graviational field with strength $g$ at a depth of $z+dz$ is equal to the pressure at $z$ plus the pressure caused by the weight of a slab of volume ...
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59 views

How long would rising hot air from a 15,000 meter (49,000 ft) hole in the earth's surface stay warm for?

The deepest hole drilled in the earth is the Kora Borehole. At 15,000 meters (49,000 ft), the temperature was projected to reach 570 degrees F (299°C), so drilling was abandoned. My question is, if ...
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Velocity Profile of the Upper Atmosphere

Consider an Earth-Centered Inertial (ECI) frame in which the tangential (to Earth's surface) velocity is measured. Now consider obtaining constant average velocity profiles of the atmosphere as a ...
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163 views

Maximum temperature possible on earth

What is maximum temperature that can we have on earth on a single day? Lets say an air mass is static over an area and there is no way for air mass to move, sun warming it up would increase ...
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55 views

Different time between equinoxes

I calculated from here that there are 16 104 096 seconds between the vernal and autumnal equinox, if I made no mistake, this is some 650 592 s longer than the other half orbit. I imagine this is due ...
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Is there a resonance within the earth, separate from the Schuman resonance?

In a very recent biography of Nikola Tesla by Bernard Carlson, the author explains that Tesla measured the resonant frequency of the earth using his invention - the amplifying transmitter. Tesla came ...
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How did the Moon survive next to the Earth since earth and Moon came into existence?

What mechanism(s) prevented the gravitational effect of the earth on the moon from shattering the moon when it was closer to the earth than the Roche Limit some 4.5 billion years ago?
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Terrestrial Space Elevator Construction - Plausability

Framework If there was a cable constructed at the equator about the circumference of the Earth, and if this cable had sufficient strength to remain intact while erect, call this tensile strength T. ...
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Could there be a planet just as the Earth, but bigger?

Could there be a planet twice or thrice the size of Earth but while being the same? and by the same I mean, hosting the same life as Earth, having a day last 24 hours and a year 365 days. Basically, ...
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120 views

Could water physically makeup the core of a planet or otherwise large celestial mass?

Knowing very little about the nature of water, wondering how it might behave at the centre of a planet or centre of an another massive gravitational body. Could water take such pressures or might it ...
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Computing Latitude Given Quiescent Gyroscope Data

Suppose I place a gyroscope in a theoretically perfectly quiescent, closed room. Let its output be given as a vector ${\bf v} = (v_x, v_y, v_z)$ indicating rate of rotation around three orthogonal ...
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24 views

Atmospheres and oceans on lower gravity planets

Using Earth as an example, how much less gravity could the planet exert and still retain its atmosphere and oceans? Or is it a matter of size, mass, magnetosphere, place in the solar system, all of ...
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30 views

What path would it produce if someone kept on going after their shadow (on Earth)?

Imagine someone is standing on the surface of the Earth (let's assume it is completely flat) and they start going exactly in the direction their shadow is cast (that is, exactly opposite of where the ...
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56 views

If Earth is oblate why don't oceans flow to the Poles?

The Poles are ~21 km downhill from the equator in a spherical coordinate system. So why doesn't water pool there?
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55 views

Would the Earth have weighed the same if no life had developed on it?

I was reading this question and talking about it with my flatmate when a question came up. Ignoring the effects of losing or gaining mass due to cosmic dust, meteorites, and atmospheric losses as ...
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126 views

Difference between Critical and orbital velocity

What is the difference between orbital and critical velocity of satallite ? I have read that critical velocity is constant value and it does not depend upon altitude. It only gives the velocity of ...
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88 views

Earth's surface area

Here we are trying to calculate the earth's surface area via geodetic coordinates: \begin{align} x&=(R\,p(\lambda)+h)\sin\lambda\,\cos\phi\\ y&=(R\,p(\lambda)+h)\sin\lambda\,\sin\phi\\ z&...
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Is the period a physical observable in General Relativity?

I am currently seeing the classical tests of GR. To justify the introduction of a test based on the Doppler effect, the professor says that the previous test ( Shapiro and echo-radar test ) is based ...
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How much time does it take in Earth to generate the energy supply that the sun produces in one second?

According to this article which I ignore if it's correct The amount of energy the sun emits every second is , the amount of energy the sun emits by second is 4x10^33 ergs . And according to this other ...
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1answer
55 views

How can I obtain the position of the Earth on the orbit for given date?

I would like to be able calculate (or at least download some time-series data of) the position of the Earth on it's orbit at given date. For my purposes, it would be sufficient to account for the ...
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63 views

Does Earth's precession rate change with the seasons?

As Earth's precession is caused by the differential solar, etc., attraction to its 'spare tire', then does the rate go to ~zero at the equinoxes and ~twice the average at the solstices? (preferred ...
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What are ShadowBands during SolarEclipse and how can it be reproduced?

I recently got to know about different phases of a solar eclipse and its impact on Earth and its living creatures.., but one of the most interesting and not well explained phenomenon is the ...
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On the formation of Earth's moon

NASA states that : The moon was formed ~4.5 billion years ago, about 30–50 million years after the origin of the Solar System, out of debris thrown into orbit by a massive collision between a ...
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2answers
213 views

Proportional acceleration due to changing density of the Earth

My question has to to do with a recent video Minutephysics posted about the time it takes for a person to fall through the earth, found here http://www.youtube.com/watch?v=urQCmMiHKQk At around 4:05,...
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What is this bright spot in the sky?

I took this picture a few minutes ago (35 minutes ago, currently 1828 here) As you can see there's a VERY bright spot on the right that shows a spectrum on the one side. I am pretty confident it's ...
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To what altitudes does cosmic radiation penetrate?

How far does high energy (Cosmic) radiation penetrate(km above sea level) into the planet earth? And at what rate(/m^2/s)? (limited set of rates here) (The Aurora is low energy protons that stop at 90 ...
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Earth's magnetic effect on my magnet

My magnet seems to work independently of, and unaffected by, the Earth's magnetic field, yet the magnetic field of my magnet changes as I introduce some other similar magnets of varied sizes into its ...
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745 views

Compute and plot satellite position on 2D Earth map

I would like to create a simple satellite tracking software, that will compute the position of a satellite at any time, and show its location on a 2D map of Earth. Let's assume it is possible to ...
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Interaction of geomagnetism on free falling coil

Take the Earth, or a similarly large body with an Electromagnetic field. For now - expect atmosphere. Then take a much smaller object - say the size of bus, containing a coil with many windings. If ...
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174 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....
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Does anyone know where I can find values of gravity?

Does anyone know where I can find the values of gravity at different places across the globe and at different heights? I am doing an assessment on gravity and can't find any data for the values of ...
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Can energy be retained if the pressure still stay's the same?

added pressure = Heat, Thought about this for a while what if it was, Pressure = Same heat as before when pressure increased. Is this true?
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Will Earth's rotation be altered if a circularly polarized gravitational wave passes through it?

I have read this question: If you rotate a polarized classical electromagnetic wave by 180° about its axis of propagation, you don't get the same wave back; you get the same wave phase-shifted by ...
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What is the unit $P_s$ in this chart about quantum spin oscillation in a magnetic field?

I came across this in an 'Up and Atom' video on YouTube, hosted by Jade Tan-Holmes. It is the third video in her quantum-biology series, about bird navigation, at 13:30 of the video.... The one axis ...
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At the time when Earth was hot liquid why the Si-Al layer covered only partially the Si-Mg layer?

At the time when Earth was hot liquid, why did the Si-Mg layer covered the entire surface, while a less denser Si-Al layer covered only partially the Si-Mg layer? I am very curious as to how a ...
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What is Earth’s total external magnetic flux?

What’s the total magnetic flux of Earth’s exterior magnetic field (webers)? I know Earth’s magnetic field is a little complex, so for simplicity let this be the integral of the surface-normal ...
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Earth's surface radiation

Earth's surface radiation I have been researching Earth's energy balance at various latitudes and have posted my work so far on Wordpress at https://hotgas.club with the title "Earth's Radiative ...
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1answer
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How can i analyse this motion?

Hello (Im from south Korea. im sorry for my english in physics.) im curious about this gravitational spiral motion. can its trajectory and time took to collide be guessable? or can i calculate this ...
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Angle of dip and Magnetic meridian

I was recently studying Earth's magnetism. I came across two definitions of angle of dip. " it is the angle made by the dip needle with the horizontal to the earths surface " it is the ...
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Will a neodymium magnet levitate on ice at Earth's North and South Pole?

Will a neodymium magnet levitate on ice at NP or SP? Asking just because these magnets are powerful and the Earth magnetism is fairly stronger at poles than at the Equator.
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Why does the rotation axis of the Earth wobble over time?

I've learned recently that the rotation axis of Earth (axial tilt or obliquity) oscillates between 22.1 and 24.5 degrees. I would like to understand why does that happen. Having a basic understanding ...
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If Earth slows down its rotation due to tides will this be diminished by the friction between its different layers as they cool down?

If we suppose that planets act simmilarly to galaxies or planetary systems which inner parts move faster than the outer will then the possibly faster inner layers of Earth speed up the surface by ...
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52 views

What will pole reversal cause to modern world and civilization?

I don't think it's just a matter of reorienting maps and recalibrating compasses. In any case, how long does a inversion last? hours, days, weeks, years? If it lasts days or more.... would Sun fry ...
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Would the change of Earth's speed of rotation induce a magnetic attraction between two charged particles?

When two negatively charged particles are standing still regarding the ground I assume there will be only an electric repulsion between them with no any magnetic interaction. But let say we can speed ...