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1

Every month there is a new moon. The moon isn't visible on this day. You've seen it before. That's how dark it would be.


-1

Earth behaves like a magnet because the molten iron core of the earth interacts with the movement of electron on the surface of the planet. Use a compass to determine the direction of the north and south magnetic poles. So, the earth behaves magnet


2

If you're asking how intense the earthquake feels, this is well described by the peak ground acceleration (PGA). By this I mean that the sensations people report are well correlated with the PGA. The Richter scale measures the energy released by the earthquake, but this is not necessarily correlated with the PGA and therefore with what people feel. It ...


1

I doubt this is correct due to how the Richter scale functions. The Richter scale is in log 10. This means that to go up 1, you multiply by 10. Therefore, 7 is 10 times more powerful than 6.


4

Alpha decay, which is why it generally comes from natural gas fields where the alphas are trapped with the methane (in the US there are several in Kansas, Oklahoma, and Texas with reasonable fractions). There is a long history of helium in the US, where the Bureau of Land Management has been responsible for the helium reserve since the days of giant ...


0

The mean radius of the earth's orbit has not changed perceptably in the last 1000 years, or even in the last 10,000 years. In the long run, though... The dominant mechanism in the long run is the solar wind, which is estimated to cause a mass loss of 7-9 x 10^-14 per year. As solar mass is lost, conservation of angular momentum causes the earth's orbit to ...


4

Is there evidence to support that the earth has a molten core? Yes. We have these things called volcanoes: ;)


20

There is pretty strong evidence falling into groups Seismological As transversal waves do not propagate through liquid. By monitoring the travel times and types of seismic waves globally after earth quakes, one can reconstruct the velocity profile for the different kinds of waves in inner of the earth. Then one can see that the transversal waves are ...


9

Shear-waves propagate in solids, but not in liquids. Pressure waves propagate in both. Earthquakes generate both kinds and seismographs can be built which are sensitive to the two kinds separately. Both kinds of waves have shadows on the opposite side of the Earth, but the differing size and shapes of those shadows show that the outer core is liquid but the ...


1

You seem to be asking for a distance above the event horizon at which time dilation due to the gravitational acceleration of the black hole would convert 4 billion years to 1 second. As all time is relative, what you really are asking for is the distance above the event horizon at which it would APPEAR to someone on Earth that an event which takes 4 billion ...


1

A few things: 1) time dilation is only a relative effect. A clock on earth would tick differently than one far from the milky way, but people on Earth would notice no abnormal effect. 2) To first order, time dialation effects are governed by the gravitational potential energy at a point. It turns out that the time dilation due to the mass of the ordinary ...


0

I think you can't do it with this data. because time dilation of our so-called "UNIVERSAL TIME" is lagging behind w.r.to a body in deep void because of mainly due to earth's gravitation, not sun or the center black hole of milky way proof: $$R=\frac{CT}{2\pi}\sqrt[2]{\frac{\Delta t}{t}}$$ where $T$ : time period of revolution of milky way. ...


3

In your context, the second interpretation is correct. The fact is that falling objects accelerate both on Earth and on the Moon. The sentence is saying that the amount of this acceleration, regardless the source, is six times greater on Earth than on the Moon. In other words, things accelerate towards the surface of Earth six times faster than they ...


0

The leading theory for formation of the Moon is that a large object collided with the Earth and threw off a cloud of debris. This cloud then clumped together under it's own gravity to form the Moon. Simulations of the cloud show it formed outside the Roche limit - at around 1.3 times the Roche limit in fact. So the Moon has never been closer to the Earth ...


2

Gravitational force is really weak compared to the other fundamental forces, so it's very difficult to measure the gravitational constant. This is how Cavendish did it without knowing the Earth's mass: He put two lead balls on either end of a long bar. He hung the bar at its center from a long twisted wire with known torque. Then, he placed two really ...


0

Brionius dealt with the value of G. Cavendish's experiments also confirmed the product of masses term. The inverse-square portion of Newton's Theory of Universal Gravitation was immediately accepted, since it straightforwardly produces Keppler's Laws. Further thought shows that, in order to produce stable orbits, the exponent must be exactly 2 - no more, no ...


0

This is explained in the Wikipedia article on the Cavendish Experiment. Cavendish measured the gravitational attraction between two known masses using a torsion balance apparatus, which allowed him to calculate $G$ (to a surprising degree of accuracy given that it was done in the 1790s). That measurement did not involve the mass of the Earth. Once $G$ was ...


1

You dont know the mass of earth, but you know the force earth apply to you. This is F=mg, where g is 9.8 m/seg^2 Buut this is equal to the gravitation force, F=GmM/r^2. G is the gravitation constant, M the mass of earth, m your mass and r the radio of earth. Cavendish was who messure the earth mass. In that time, Cavendish knew the radio of earth and G (he ...


1

Short version: The Earth is round because it was molten once. It would definitely matter if our planet were a cube, because gravity near the points would be off from "vertical." Longer version: Smaller objects in our solar system are indeed more oddly shaped - they often look like a bunch of small blobs stuck together. They slowly build up in size as bits ...



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