Earth Definition and 1000 Threads

I am not sure if this would be where i would post this but here goes a question i been wondering about earth 3.6 or 3.7 billion years ago life emerges on our planet.. so we go from a rock that is not getting any bigger on its own with life that grow and grows when it dies there is leftovers...

... Continued from part 14. The Sands of Duna Part 15: Coming in fast Collinsmark is not affiliated with Squad nor Kerbal Space Program We are coming in fast. Really, really fast. Might was well fold up the solar arrays. There's areobraking in the near future. [Figure 122...

Homework Statement Suppose that the electric field in the Earth's atmosphere is E = 92 N/C, pointing downward. Determine the electric charge in the Earth. Homework Equations The Attempt at a Solution I suppose that I'm supposed to construct a Gaussian around the Earth and find the...

Homework Statement The Earth is not a uniform sphere, but has regions of varying density. Consider a simple model of the Earth divided into three regions-inner core, outer core, and mantle. Each region is taken to have a unique constant density (the average density of that region in the real...

Homework Statement A tunnel is drilled from the surface of the earth(mass assumed to be M and radius to be R) to its center . A body of mass m is dropped from the surface to the center through the tunnel. What will be the velocity with which the body of mass m will hit the tunnel...

Hello, Firstly, let me point out that I do not have much knowledge in physics. However, after reading a certain book, I wanted to find out more about time dilation. I spent a few days reading about it. Here is the problem: Homework Statement I would like to be able to calculate the...

I was wondering about how to speed up time because I was bored, so I considered rotating my body clockwise (in the northern hemisphere) in order to speed up the rotation of the Earth by creating angular momentum opposite to that of the earth. I was thinking that this would then speed up the...

They're the first water clouds ever seen beyond our solar system by Ken Croswell, author of The Alchemy of the Heavens: Searching for Meaning in the Milky Way Astronomers have found signs of water ice clouds on an object just 7.3 light-years from Earth—less than twice the distance of...

I want to know whether a person can float in the space just 100 km above the Earth's surface. If we would float, what are the factors that make us float? And if we don't, what are the factors that keep us from floating in the space? Those object need to orbit around Earth at high speed like...

This is my first posting, so forgive me for any errors I am making. A quick review of topics in the past shows that my question has been touched on in the past, but was not (in my opinion) given any serious attention or consideration. Over the past 5 years or so, I have witnessed (almost...

Imagine that you could dig a hole up to the very center of the Earth and sit there. What will you experience? Complete weightlessness or the experience of being torn apart in every direction?

Hi Folks, Why does a parachutist experience 0g (assuming falling in a vacuum, no drag) when falling towards the earth? How can he not experience gravity when he is in a gravitational field which is pulling him towards the earth. Im sure this is a classical question but I have not found a...

If you can "catch up" to the light reflected from the Earth at that time in the past. What kind of resolution would you get? Could you zoom into the surface such that people/animals could be visible.

Dark Matter constitutes 26.8% (wikipedia) of the observable universe. So where is it? I ask this question because although it is said to be not visible. It must interact with light matter at a gravitational level. It only makes sense to me that dark matter must be all around us and...

What is the potential of Earth with respect to (wrt) infinity (C=710uF)? I am assuming that infinity is the correct reference here. Suppose a capacitor that's normally used in an electric/electronic circuit is a) discharged by connecting its two (2) terminals. b) then they are...

First time writing , hope all goes well. Looking to understand the properties of rare Earth magnets, are you able to reverse the polarity of two magnets that are stuck together and separate them with an electromagnetic pulse or any other instrument ? Please if this is the wrong forum ...

why gravity on Earth is very strong on the north atlantic ocean? ok, obviously where there is thick crust like himalaya (everest), huge land mass - more gravity, but the ocean?! where the crust is thin?! source http://en.wikipedia.org/wiki/File:GRACE_globe_animation.gif

How Earth is considered to inertial frame of reference?

Why the Earth is rotating around the sun? I know the centripetal force is required for the rotation of Earth around the sun. But initially there is required some force on Earth to rotate around the sun.

Hi, everyone. I read how occurs magnetic field in Earth. However, the temperature of outer and inner core is bigger than Curie temperature of iron. So, I have one question. If they have bigger temperature than Curie temperature, how they can have magnetic properties? Thank you.

What features of our Earth amaze you the most? They can be natural wonders, science phenomenons, landforms, etc. Share anything that you think captures the essence of Earth's beauty. Hopefully I can learn some things that I did not know before. These are my favorite natural wonders...

I have an object (A) at some altitude above the Earth ellipsoid, and a point (B) on the surface of the Earth. Since you're not confined to the surface of the Earth as you travel from A (at altitude), to B, I'm getting confused. If I were to create a (Cartesian) vector pointing from object...

I am not sure if I should start a new thread or revive an old thread this because it is the same topic. Location of tests: Scandinavia I simply want to know why and how a current carrying conductor parallel to Earth surface moves perpendicularly to the current flow and parallel...

Homework Statement A person on Earth weighs 750N. What would the person weigh on a planet with 1.2 times the radius and 1.9 times the mass? Homework Equations mg=Gmme/re2 The two ms cancel, leaving: g=Gme/re2 The Attempt at a Solution Since the two ms cancel out, I thought that the...

I may have some confusion with the terms "pressure" and "gravity" here. If hypothetically we could sink towards the centre of the Earth, say with our feet pointing towards it, as we start to sink intuitively pressure on top of us would gradually increase, as it does when we sink into the ocean...

Is the value of g at the center of the Earth zero or infinite ?

I tried to make the title as descriptive as I could without being overly long. Anyway, I've been trying to work this out but I'm having some difficulty. We all know the strength of the electromagnetic force is very much greater than the gravitational force. I'm not sure what it is as it's a...

Hello everyone! If a ball is released from the top of a very tall building, would it land ahead in the direction Earth is rotating (to the east) or would it lag behind i.e the Earth "moves out" from underneath it so it lands to the west? I think it should land ahead to the east since its...

dear sir the charge on clouds and ground can be different and this causes lightning due rain only. i want to know more about the process that causes it

... Continued from part fifteen. To the Mun! Part sixteen: Home, sweet home [Figure 234: Service module separation (1/2)] [Figure 235: Service module separation (2/2)] [Figure 236: Reentry (1/2)] [Figure 237: Reentry (2/2)] [Figure 238] [Figure 239]...

Homework Statement suppose there is tunnel through the Earth which dose not cross center. If the drop object in this tunnel, how many time it takes to reach end of tunnel? earth is perfect sphere, there is no friction too Giving data: Earth mass and radius Homework EquationsThe Attempt at a...

I read an articles that the convection of the inner core of the Earth which is assume to be liquid metal produces Earth's magnetic field, is this true? Has scientists did a demo?

As far as I'm informed time slows down the lower the gravity and the faster we move. Let's say I go out in space with an analog clock and orbit the Earth. When I come back to Earth after, let's say, a week will my analog clock show different time from the clocks on the planet ?

How long would it take for an apple to fall to the Earth if it were as far away as the Moon and how do you calculate that? And, say the apple appeared out of nowhere stationary (relative to the Sun) at that distance, would the movement of the Earth leave the apple behind or would the apple...

First post Heey Why does the air move at the same velocity as the Earth ? Assuming there is no wind. I fear my question will be misunderstood so I'll expand a bit. The zero velocity for air (no wind) is the same velocity as the earth. Wind = slower/higher velocity relative to the velocity of...

Is carbon dioxide at relatively the same concentrations in China, America and Antarctica for example? Or (I'm not discussing altitudes) does the concentration of carbon dioxide fluctuate based on where you are on the Earth? Assuming that all measurements are made at the same altitude, would the...

Is it true that a pinhead size if the Sun's core if materialised on the Earth would be too dangerous to go within 90 miles of it? I read from Wikipedia that the energy produced in the Sun's core is about 270 watts/m3. About the same as an active compost heap. I know the pinhead of core matter...

Been reading laymen's books on general relativity and I'm in need some clarification! ... Line 1: The shortest path from a point 9.8 meters above the surface of the Earth to another point at the same location in space but 1 second later in time. Line 2: The shortest path from a point 9.8...

Hi,does exist any simulation of Sun and Earth circulation with data of lasting of day and night in different places on Earth during seasons? Thanks a lot

Homework Statement Alright, this is probably going to be a long one. For a school project I am trying to simulate (in 2D) our moon's orbit around the earth, to eventually simulate a spaceship doing a hohmann transfer between LEO and LLO whilst being affected by both the Earth's gravity and...

Homework Statement We have given coordinates on the Earth from where we are shooting to the Moon (bullet has really small mass). The Moon orbit and therefore Moon position in time t is known. The task is to compute the initial velocity vector (the angle and velocity of the bullet), so the...

Homework Statement The solar constant, the amount of solar energy reaching the Earth per unit time and area above the atmosphere and an element of area perpendicular to the direction from sunlight is 1.36 kW / m². For an element of area whose normal makes a angle q with the direction of...

This question has came up to my mind and I think it really isn't easy as it sounds. In Newtonian physics we could use the Earth as the basic frame and compare velocities of cars, planes etc. on our planet. But in relativistic physics, things get complicated because, as we are in a...

If a fast moving and heavy object strikes earth,can it change its spin or rotation or both?

You have two trains sitting on the equator (one on each side of the equator so they don't collide -.-). Train one is moving East with the rotation of the earth, train two in moving west against it. both trains accelerate to a speed close to the speed of light, using the same amount of energy. So...

The International Space Station now has a set of High Def cameras hooked up to a live stream. High Definition Earth Viewing When it's on the dark side of the earth, it will often appear black. You can use this image to check it's location. Refresh the page to get the current location.

First off I'd like to say my understanding of physics isn't very good, so I'm sorry if this question is a non sequitur. Suppose we have two entangled particles, one on Earth, and the other on a ship that is traveling away from Earth at near to light speed. According to quantum...

I hope this is interesting... I am standing on the Earth's surface, I want to know the angle created with an Isosceles triangle 10' across by 3,960 miles on each side. I know the answer is just under 90 degrees, but need a more precise number. The problem came up when discussing whether a...

I hope I posted this in the right section. Here are two questions I have. 1) If I pull on a very heavy object, that object's mass resists my attempt to accelerate it. This is known as inertia. When that object resists my attempt to accelerate it, it essentially pulls back on me with an equal...

I posted about this on a muber of threads, but answers I red didn't really made me clear some confusion about this, so I apologize in asking about this but I'm just hoping of a convincing answer. In talking relativity, most examples are given without any reference to our everyday lifes, since...