Universal Definition and 477 Threads

The Explorer VIII satellite, placed into orbit November 3, 1960, to investigate the ionosphere, had the following orbit parameters: perigee, 459 km; apogee, 2289 km (both distances above the Earth's surface); period, 112.7 min. Find the ratio vp/va of the speed at perigee to that at apogee.

An object is released from rest at an altitude h above the surface of the Earth. a) Show that its speed at a distance r from Earth's center, where R_{E}\leq r\leq R_{E}+h, is given by v=\sqrt{2GM_{E}(\frac{1}{r}-\frac{1}{R_{E}+h})} b)Assume the release altitude is 500km. Perform the...

As you get further away from the Earth's surface your gravitational potential energy increases, but when you get closer center of the universe (or something like that) your gravitational potential is decreasing... ? Meaning when you are the FURTHEST away from the Earth's surface your...

we all learn this law. It state that the force between two bodies of mass m_1 and m_2 is attractive in nature. The gravitational attraction F is directly proportional to the product of the masses of the two bodies and inversely proportional to the square of the distance between them. From the...

[FONT=Verdana]I've heard from someone that if you superimpose enough pictures human faces (of all races) on top of each other, you get something like a universal human face. I mean like if you have several samples and superimpose all faces from each sample, the end result from each sample would...

A simple[trivial?] postulate that gives a "Universal Set" and resolves the "set of all sets" paradox[in the geometric sense]: A circle of radius R, is isomorphic to a circle of radius 1/R. [1/R]<--->[R] For any arbitrarily large circle of radius R, there is an exact correspondence with...

Brian D. Josephson Department of Physics, University of Cambridge The point in regard to mathematical thinking, which motivates our model, is the following. Consider first of all what the brain does in visual perception. Here the primary information from the visual receptors goes...

I was wondering if there is any real evidence within the field of quantum mechanics to support the idea of a universal collective consciousness? any ideas... :cool:

Light speed relative to universal speed... HI guys, Just a simple request for confirmation that I have it right. It may seem so obvious to you but to me I just need to confirm with currently held thought ( this forum ) that the photon travels at relativistically zero velocity with the...

Here is the definition of "algorithm": http://en.wikipedia.org/wiki/Algorithm DNA is an algorithm, a finite set of instructions, which can construct a carbon based life form. The life form physically contains the DNA and the DNA contains the life form in an "abstract" sense. At a...

"Time's arrow, or what universal property is asymmetric, anyway?" A lot has been made of time's arrow not appearing in the equations of Newton, statistical mechanics, relativity and quantum mechanics - none preferring that past precedes the future or vice versa. Some very specific particle...

The federal government will create a Health Care Oversight Agency with 1 representative from each state and employees with all necessary skills. The president will appoint the director after the first year following a presidential election if a 9-year tenure has transpired. The appointment will...

A "concept" question... I think the answer is yes... which means it probably is a definite "no." The sun is directly below us at midnight, in line with the Earth's center. Are we then heavier at midnight, due to the sun's gravitational force on us, than we are at noon? Explain.

http://www.desargues.univ-lyon1.fr/home/lygeros/Mensa/mclassi.html If so, why?

My english teacher (we talk about everything in english class) said that the universe, without a doubt, would continue expanding forever. I remember reading in a book tho that there were several theories about this and none was for certain and they depended on the density of the universe which...

Can anyone give me a definition and explain why it appears in Newtons law of gravitation.

Is there such a thing in our Universe as a "Universal Shape"? By that, I mean, is there one shape that everything else in the universe is made up of? I suspect that a "circle" would be more fitting if there as such a universal shape. If everything in the Universe is made up of Atoms...

A couple of questions about Universal Gravitation.. When satellites are launched with velocities greater or lesser than the required launch velocity [Underroot(G*Mass of earth/Radius of Earth)], their orbits become elliptical with the Earth as the near or far focus. Why? Also, 'The Earth...

I posted this a while back on the old MKaku forums. I saved it in NotePad and decided to post it again. I just changed a few things and fixed some typos. --- I was thinking about how the Universe came to be, with the atoms, and the subatomic particles, and all the other stuff. Then I thought...

Anyone ever stop to think that the only thing that makes sense out of anything at all is consciousness? Hmm ... Perhaps our brains and bodies are merely receptacles, linked to this thing called Universal Consciousness? Think about it. How else could we ever possibly agree that 1 + 1 = 2? If...

Ok, here's the problem: Neutron stars are extremely dense objects that are formed from the remnants of supernova explosions. Many rotate very rapidly. Suppose that the mass of a certain spherical neutron star is twice the mass of the Sun and its radius is 5.0 km. Determine the greatest...

I'm having a little bit of a problem with this one. Here's the question: X-ray pulses from Cygnus X-1, a celestial x-ray source, have been recorded during high-altitude rocket flights. The signals can be interpreted as originating when a blob of ionized matter orbits a black hole with a...

I've read that the Big Bang is sometimes referred to as the "Big Cool," since it is likely that the early universe cooled very suddenly, and thus expanded rapidly. I've also read that the entropy of the universe is always increasing (ok, that's obvious), and as entropy increases the average...

http://www.boredofstudies.org/community/attachment.php?s=&postid=266675 when doing this question, isn't the radius of the planet supposed to be added to the altitude of the satellite? having said that, would the term 'orbit' mean that the satellite is 35 000km away from the centre of mass...

If we have two electrons. Now put each one of them in a separate identical box and observe their properties, and collect as much information as possible, would you have obtain an identical result?

how do we know that the expansion of space is universal ,rather than local to our observable portion of it?

out of every physicist known to man who would you think could solve the universe calculation? 1 calcution based on the entire universe I would say einstein and Newton could do it, but would take an extreme length of time.