Recent content by LucasGB

Nice questions! The tracks are 1m wide, and I'm thinking just about my face.

For the sake of simplicity, let's say it's directly above my head (in the zenith).

While I was strolling across a race track the other day under intense sunlight, I found myself pondering over an interesting little problem and I would like to hear opinion about it. Cutting to the chase: would I be hit by more reflected sunlight if I walked on the yellow, more reflective...

So lambda = beta?

Hello, Suppose you observe some foam. The foam is formed by a set of bubbles, and each bubble blows up after a random time. The density function of the time each bubble will take to blow up is probably exponential, with rate lambda. The total amount of foam (Q) must also decay exponentially...

No, it's from a mathematical model of behavior. I'm an experimental psychologist.

Help simplifying an equation - URGENT, PLEASE! Hello folks, I'm trying to simplify the following equation: V = (a(1+a^n)-Q(1+a))/((a^n)*(1+a)) I really need to eliminate the divisor. Thanks in advance, Estêvão

Thanks for the reply. Yes, I know they date from the Big Bang, what I mean is how long they have been in our bodies. Apparently, the original research on this topic was published on the 1953 Smithsonian Institute Annual Report. So, if anyone has access to this (I don't)...

How "Old" Are The Atoms In Our Body? Richard Feynman once said, "So what is this mind of ours: what are these atoms with consciousness? Last week’s potatoes! They now can remember what was going on in my mind a year ago — a mind which has long ago been replaced. To note that the thing I call...

Wow, Quantum Mechanics is subtle. Thank you all for your help. A little bit off-topic: what would you recommend as the best introduction to Quantum Mechanics? Is Griffith's book good?

Very cool, thanks.

I see, that's very interesting. So even if I build my pencil with the most rigid material existent, seen from afar, it would always have that "noodly", "twisty" property?

Suppose I hold a pencil by its tip and turn it around 20°, around the axis which goes through the pencil's length. The pencil's base, at the other extremity, a few centimeters away, will also turn by 20°. Now suppose this is a huge pencil which stretches from the Earth to the sun. By turning its...

Thank you for both your replies. 2. Why would the entanglement disappear? 4. Isn't this exactly what the uncertainty principle is about?

I know this is probably an extremely simple question, but anyway... I shoot two particles towards each other. They collide, and then go their separate ways. Then I measure the position of particle A with full precision. This will allow me to determine with full certainty the position of...