Tag Info

New answers tagged

10

Back before Copernicus (Or rather, before his view was accepted), we used to think the earth was the center of our solar system. Therefore, if you search for those models, you can find examples such as: This is, of course, based on observations rather than calculations, but it represents the complication of the solution nonetheless. (Image taken from ...


11

You certainly could define your origin of coordinates to be the center of the Earth. It would be a little tricky, because this would no longer be an inertial frame of reference, so there would be fictitious forces (or Coriolis forces). That is, your equations of motion would no longer look the same. One reason the standard barycenter frame of reference is ...


0

It will oscillate around the center of Earth. To find the equation you will need to solve the generic oscillation problem: the gravity force / acceleration depends on the distance to Earth's center while everything which is further from the center will not impact on the acceleration. $g(x)=G\cdot M(x)/x^2$; $M(x)=\mathrm{average~earth~density}\cdot ...


1

The Earth and the Moon revolve about their barycenter (center of mass of the Earth/Moon system), which is inside the Earth and is about 4,670 Km from the center of the Earth on a line connecting the center of the Earth with the center of the Moon (http://en.wikipedia.org/wiki/Barycentric_coordinates_(astronomy)). The apocenter of the Moon is its center when ...


3

Since a new moon has to have the sun shine on the entire surface facing away from the Earth, the time between 2 new moons is the time for the Earth Moon system to complete a synodic period. The period of two masses around the common center of mass is always the same.


4

In the following the term "charge" refers either to mass or to electric charge and the term "Inverse Square Law" refers either to Newton's Gravitational Law or to Coulomb's Law respectively. SECTION 1 A. The Inverse Square Law for Spheres with uniform surface charge density Proposition A : Let a sphere of radius $\:\rm{R}\:$ with uniform surface ...


3

If we consider the earth as an isolated system there are no reasons to have our planet to change its angular momentum, due to conservation of the latter. However if we consider the earth and its neighbourhood we have that the earth is actually decelerating because of the Moon. The Moon has an orbital period longer then the rotational period of the earth, ...


3

I suspect that you have not understood your "it is believed" source. Most likely, it is referring to the lack of diffuse light supplied by the atmosphere. Without this diffuse light, illuminated areas would be very bright, and shadows would be very dark. Like something illuminated by a spotlight. And that's exactly what happens on the moon, with the ...


0

The explanation of ovality of earth surface is quite illustrative but needs further detailing to predict the geometry of the real surface. Because of the wide variations in the density of the earth from point to point the proportion of gravitational attraction and the centrifugal force over different elements of mass $$dm=\rho\,dv$$ varied from point to ...



Top 50 recent answers are included