EdEarl

I do not know what you need to satisfy your question, because you have presented all the evidence I need to answer your question for myself. Thus, the only things I can say are obvious, for example there are two values in each bit of a binary number, either 0 or 1, and dividing a whole number by 2 always gives a remainder of either 0 or 1, and multiplying a fraction by 2 gives a whole number of either 0 or 1 plus a fraction. Moreover, the number 2 is the only number that gives the correct answer. If you can precisely explain what is is you do not understand, I might understand what you need.

Television modulates audio as FM ad video as AM. See: Wikipedia. IDK for a fact, but I suspect that some military radars use a combination of AM pulse modulation (for target range and direction data) and detect Doppler frequency change of returned signals (for target speed and acceleration). To avoid detection, it might also FM modulate the carrier into spread spectrum.

That's a good image for fracking. IMO it should be banned unless people's lives depend on fracking to get more oil or gas. I'd prefer we quickly build renewable energy production till we can supply 90+% of our needs, use oil & gas sparingly, and use no coal.

Ultimately we need to switch to much lighter weight electric cars, hopefully with super-capacitors for electricity for storage. Regardless of storage technology, prices are coming down, driving distance is increasing, and we will be able to eliminate burning most oil and coal. Unfortunately, total transition will take decades, even with technology available today, because there are power plants and cars with good service years remaining that are currently being used. An even bigger problem is the powerful people who want to extend the use of coal and oil, and who buy political decisions in their favor. I wish you luck in keeping that oil in the ground, and that you avoiding fracking in the area.

It seems no one can help you here on scienceforums. Hope you can find help elsewhere.

Welcome Dr. Enjoy scienceforums.

It is misleading to say density affects gravity. It is better to say that as two masses get closer to each other, the force of gravity between them gets stronger, and it is possible to get closer to a dense object than one that is not dense.

The Newtonian force of gravity is given by the following formula: F = G {m_1 m_2}/{r^2} See Wikipedia Assuming your two bodies are attracted to a third body that is placed at the same distance from your two bodies, the more massive body will attract with more force. Density is not a factor. IIRC an object with mass distributed (e.g., galaxy) is the same as the mass of a point object of equal mass at the center of the distributed mass, for things outside the volume of distribution (e.g., things outside the galaxy).

I have no idea whether stretched or created is correct; I think no one knows. I do not know whether stretched or created is correct; I think no one knows.

A rubber sheet will stretch evenly all the way across in all directions if pulled evenly in x and y, thus the grains of sand will spread evenly. Try it with a rubber band that you put marks on every 1/2 inch or so. all the marks will become further apart, evenly.

Hi Mark, You aren't the first, nor will you be the last, to pose questions as if they were statements. I believe folks here do not hold it against anyone for doing so (some are also guilty of the same). The main thing is that you use the experience for learning, instead of pontificating about a pet "theory," because we get folks who really know the world is flat (or some such thing) and who cannot or will not understand. Welcome to scienceforums, lurk in the shadows or say something; we don't bite hard enough to make you bleed.

Hi mpmcd101 IDK what mpmcd101 means. It's too difficult to remember. I'd call you M, but that was taken by Flemming. How about 101? You found a good place to test your understanding, and to learn.

IIRC, the simplest Lisp interpreter can compute anything computable (i.e., Turing machine equivalent) using the following functions: car, cdr, cons, eq and atom. Although, open and close parenthesis are used extensively, too. In addition, we would have () = NIL, which is the empty list and can be used for False. We might also need atom T = True. See: http://stackoverflow.com/questions/2731611/really-minimum-lisp A 2-sate, 3-symbol Turing machine has been proven universal. See: http://en.wikipedia.org/wiki/Wolfram%27s_2-state_3-symbol_Turing_machine

Space is expanding everywhere, locally and at a distance, at about the same rate, and matter is distributed evenly throughout space, both locally and at a distance. That's my understanding. Now clusters of galaxies may be gravitationally bound, e.g., Andromeda and the Milky Way that are moving toward each other, which belong to the Laniakea Supercluster.

The juxtaposition of your statements make me think you believe space is thinner at distances we see as far away (i.e., 12B light years), which is not the case as I understand it. On the other hand, I may misunderstand your statements. The Cosmic Microwave Background radiation shows the universe is almost homogenous, because the temperature of that radiation is 2.72548±0.00057 K. In other words, the density at 12BLY is about the same as nearby.

Also posted in homework.

You only need to pose the question once.

Jobs! I don't know how to answer this question. My guess is that a doctor is more likely to find work than a physicist. Since IBM's Watson won playing Jeopardy, some people think many skilled jobs may some day be replaced by computer programs. We would like to know how fast this transition will occur and what are the consequences. Will this scenario affect you and your job? No one knows, and there are other unknowns, such as Climate Change and World Politics. Thus, I don't know how to answer your jobs question.

I volunteered for three years service in the US Army, after which, the government helped pay for my college education. Although, I also worked while I was at the University. The Army sent me to school to repair Nike missile systems, a choice I made as part of my volunteer service, which meant I was able to get a better than minimum wage job.

No one can answer that question for you. I'd say that if you enjoy interacting with people, then being and medical doctor would probably be a good job for you. Although, there are some specialties, pathology and radiology, for example, that require a doctor who does not interact with people. Some kinds of research would require someone with knowledge of both biology and physics, e.g., nanotechnology. At my university were a couple of MD--PhD Electrical Engineers, who specialized in developing medical electronics. (Electronics is all physics). If you want to bad enough, you may be able to satisfy both your parents and yourself.

Speed variation as load changes indicates you do not have a synchronous motor. Synchronous motors change speed with a change in AC frequency. You may have an induction motor.

Yes, it's true about electromagnetic radiation, which includes gamma rays, but my oversight. Electromagnetic include, gamma-rays, ultraviolet, x-rays, infra-red, microwaves, light, and radio waves. However, your TV does not emit harmful electromagnetic waves. If you bury your TV in zeolite it will stop most electromagnetic radiation, emitted by your TV. However, it is not particularly effective for that purpose, especially for higher energy EMF such as gamma radiation. To attenuate EMF use a Faraday cage.

The three kinds of radiation are alpha, beta and gamma. Although, high speed ions, atoms and molecules can also damage tissue. I think zeolite would not be good at stopping radiation, except alpha an beta, because it is porous, like a sponge; thus, contains much air.

I think Elon Musk is technically competent and an astute businessman; thus, I believe he will master the landings, refurbish the rockets economically, and reduce the cost of putting things in space.

The time between theoretical work and observation seems to be increasing. Einstein wrote about general relativity in 1915, but it was 1919 before light was observed bending around the Sun, which was first observation of effects predicted by relativity. Higgs and other theorists wrote about a boson about forty years before it was discovered. The hypothesis called String Theory is not a bad hypothesis, it may be incorrect, it may be unprovable, but we have no alternative except to wait to see if it can be proven or not. Perhaps one day another unifying hypothesis will be developed to rival String Theory, we must wait for it, too. Patience is difficult.