Recent content by zbobet2012

The only reliable method of generating random numbers according to a Zipf distribution I have been able to find was here...

That looks better, thank you very much.

Homework Statement What is the probability that a five-card contains the ace of hearts? Homework Equations P(E)=|E|/|S| P(E_{1}\bigcup E_{2})=P(E_{1})+P(E_{2}) + P(E_{1}\bigcap E_{2}) The Attempt at a Solution The number of ways to choose 5 cards from 52*the numbers of ways to get an ace from...

F=f{\mu }_k <---isn't that the force due to friction? Or am I confused? Realizing I kind of messed up my notation, f = 170N and F_{friction}=F

Homework Statement A grindstone in the shape of a solid disk with diameter 0.490 m and a mass of m = 50.0 kg is rotating at omega = 890 rev/min. You press an ax against the rim with a normal force of F = 170 N, and the grindstone comes to rest in 7.20 s. Homework Equations τ=Iα ωz=ω0z+μkαt...

Curious: I wasn't trying to derive how much energy would be transferred in a given circumstance, but how much the ships outer hull would have to withstand to make the collison perfectly elastic. For example we can say that on a pool table momentum is conserved(within the limits of reason)...

After much work I have arrived at what should have been obvious , velocity is a vector quantity. And in a 2d plane that means it is composed of two parts, x and y. Without delving to deeply into any kind of (if basic) vector calculus, the x = vcosφ and y = vsinφ. Therefore the energy actually...

I intended to say energy there, I was being a bit loose with my terminology. Sorry.

The meteorite is assumed to be "at rest" (thus the Vnet next to the .9c). And no the meteorite does not stick to the spaceship, I am assuming the material used on the outer hull is hard enough to prevent elasticity. I am simply asking what the force exerted on the hull will be. I don't think we...

A quick look through the FAQ and search didn't reveal anything so... I know that K.e. = ½MV², however I am looking to find the energy of an impact when φ != 90°. Or to the more specific problem, if I have a Spaceship shaped like a needle moving through space at .9c(Vnet) and a micrometor hits...

Thanks a lot tide, that helps alot. I also think I found a generalized method for finding the x^n term. If we have (\frac{C}{X^k}-X^m)^z than x^n can be found where (-x)^{z-a} where ka=z-ma+n

I know its asking alot, but can you show a step by step on how to solve it? I was out of class for a few days and never got taught how... Thanks alot.

Where did this: 2A=6-A Come from?

I understand how Binomial expansion works, but I don't understand how to solve this problem. Give the term of (2/x^2-x)^6 that has no x.