Recent content by heliocentricprose

Homework Statement What is the power of a machine that does 1800 N-m of work per minute? Homework Equations KE = m*v^2/2 V = sqrt(2KE/m) The Attempt at a Solution I don't know what N-m are... so I'm not sure what to do..

I see. Thank you for your answers.

In that case, how old are the particles making up the Earth from their own perspective?

I've read that the universe is 13.7 billion years old. Also, I've read that time passes "slower" when an object is close to a large mass as opposed to an object close to a smaller mass. Take two galaxies. One galaxy is half the mass of the other. At this moment, has 13.7 billion years passed...

http://en.wikipedia.org/wiki/Haldane%27s_Dilemma This paper states that rates of beneficial mutations can not account for the time that has passed between the first homonids and humans. Has this been resolved? How?

So this means there are 1/100000000 nucleotide changes per generation?

"calculated that the per locus rate of mutation for hemophilia in humans is 10^-5 per generation" "Comparisons of pseudogenes and of synonymous sites between humans and chimpanzees have suggested mutation rates on the order of 10^-8" 10^-5 10^-8 What do these numbers represent? Base...

Is the uncertainty in the wave-function caused by our inability to measure the particles without affecting them?

On average, what percent of the human genecode changes each generation? I know there's somesort of mutation rate, but I haven't studied biology for several years and I'm not exactly sure how to calculate it.

General relativity says that the gravitational "field" is just the warping of space by mass. I like to think of the ball on the trampoline analogy. Is dark energy, basically negative pressure, be caused by the natural curvature of spacetime? http://www.geocities.com/ixi_dima_ixi/gr.JPG

How much different are the DNA of chimps and humans. I've read in a magazine that it is 98-99 percent. But, my friend tells me 95%. Who is right? And what is the difference between 98 and 95 percent in terms of the quantity of genetic code?

e=mc^2 is easy enough to understand... however, how do you define energy? It's a motion of an atom, correct? What about dark energy? Does it have some sort of mass association as well?

We all know that if we break up an atom, we get a lot of energy in return. I'm having trouble visualizing what this equation actually means. Does it mean that a large amount of energy is required to bring matter together? Does it mean a large amount of energy can be converted mass? Isn't energy...

Yes Phobos, I thought so. Some people need more, I guess. @Evo :D yes I know how to use Google, but if I don't know what information is the best, how can I find what I need. Thanks for your input. And iansmith, that's exactly what I was looking for, thanks.

Wow, I simply can't wrap my head around that just yet. I don't quite understand what you mean by scale factor in your first sentence. What is recession speed with distance? Also, If the Hubble constant changes, why is it called a constant? How is it possible that the Hubble constant...