Recent content by em370

Mod note: Reproduced contents of image with broken link: i = j x k j = k x i k = i x j Wikipedia says this about the standard basis vectors. Does this work for all (i.e, non basis) vectors? For example, if you know A = B X C does that mean C = A X B and B = C X A?

If a object with mass and density just below what is required to form a black hole is traveling near the speed of light relative to an observer, its mass should appear to increase, and its length contract, to the observer. The objects mass and density will increase pass the threshold necessary...

I feel very pathetic for asking this but if you have to round 0.45 to the nearest whole number do you take the 5 into account as it would round the 4 to 5 and round to 1 or just base the rounding off the first decimal.

My goal is to be able to get a Phd in physics and do research, particularly in theoretical physics. Most of the posts I've seen so far have been very depressing on this subject. I am in my sophomore year of high school, straight A's all honors core classes (or ap if available). I've talked...

The dart would start to accelerate downwards due to gravity once it leaves your hand, but that happens when you are at ground level as well so you shouldn't have to adjust your aim.

Hello, I'm currently a sophomore in high school and my school counselor suggested trying to get an internship in the field next summer (2013) but I'm not sure how to go about it. My main interest is physics research just to be clear, not engineering. Does emailing professors work or will it...

I took all of the data from this website https://www.cfa.harvard.edu/~dfabricant/huchra/zcat/ so I can't vouch for how the testing was done but harvard is a reputable university. I did notice that the line was shifted upwards quite a bit but I thought whatever may be forcing objects within 10...

For a science project I used Harvard's zcat data to construct a graph in excel of the velocity and distance of distant objects. I expected velocity to increase with distance due to the expansion of space but it seemed to only begin once the object was 10 Mpc from Earth. I included the graph...

How would one go about calculating the size of a tidal bulge created by the moon? I know how to calculate the gravity between two points and to calculate the attractive force of matter to the center of the Earth in the bulge you would subtract its opposite direction attraction to the matter...

Are singularities actually finitely dense? The basis of the singularity is that gravity is so strong that the object contracts without stopping and will never slow down as their is nothing to stop it( I could be wrong in this as shown by my previous immense lack of understanding). Will it...

Ya my teacher told me that when an object approaches light speed it would contract, time would move slower for that object making it appear to move slowly, and that its mass would increase so that it would take more energy to make the object accelerate. So just to clear things up if you went...

I have wondered about this as well. The only time I heard of how things actually get out of a black hole is when I read The universe in a nutshell. It said that there are things called zero-point fluctuations in a vacuum in which a particle and antiparticle are created then annihilate each...

Really? My teacher said that its speed would appear to decrease, not just the speed of its functions. Sorry about my misconceptions. Also I type my previous post before you posted this one, thanks for answering my question.

Okay reading back I realized I probably phrased this really poorly. I learned that a black hole is an object with a gravitational force faster than the speed of light which is why it is called a black hole since light can't escape. I also learned that as things approach the speed of light they...

Because that's the most common element in space. The center of the black will probably contain the heavier elements the star fused so the shell will likely contain hydrogen from space and from the part of the star that was blown away during the end of the red super giant phase. Helium will...