Recent content by Petkovsky

Aha, i see now. Thank you.

How many graphs(non isomorphic) can you construct from the degree sequence (3,3,3,3,4). The answer has to be proven of course. The only one I could find was a W5 graph, but i can't prove that it is the only one. I know that for two graphs to be isomorphic, a bijection has to exist between the...

Well this is how I understand it. You have the guy traveling in a rocket, and the one on the earth. The rocket guy's time is greater, he has traveled more into the future, hence the guy on the Earth in his frame of reference has aged more. The Earth guy's time is slower, and in his frame of...

I was reading a bit about wormholes and I run into white holes. Now, everyone keeps saying that white holes violate the second law of thermodynamics, but I can't really understand why. I suspect it has something to do with entropy, but I'm not really sure. Any help would be appreciated.

Sorry, my bad, i have copied it wrong. It says find |a| if a = p-2q. -Solution: (p-2q)^2 = p^2 - 4pq + 4q^2 = 9 - 12sqrt(3) + 16 = 25 - 12sqrt(3) |p-2q| = sqrt(25 - 12sqrt(3)) <= is this correct?

The vectors are in 3D space: 1. It says: |Q| = 2 and |P| = 3. Angle between the vectors is 30. Find a = P - 2Q. -- So for this one, i used the angle formula cos (alpha) = (Q*P) / (|Q| * |P|) and got QP = 3sqrt(3). However i don't know how to proceed from this point on. 2. |a - b| = 22, |a| =...

Yes it does :)

I solved it, thanks for the help anyway.

I mean everything's fine with the syntax, it just won't do its job.

Homework Statement Ok, i need to make a program that will search for a substring in a given string, and replace it with another one.The Attempt at a Solution #include<stdio.h> #include<iostream> #include<string.h> using namespace std;int fsubstitute(char *ulazni, char *prvi, char *drugi)...

Well unfortunatelly i can't even tough i know it, because we haven't covered that part yet.

I need to find Lim (x->0) arcsin(2x)/arcsin(3x) I can do a substitution arcsin(2x) = y => 2x = sin(y) and get arcsin(sin(y)) for the nominator, which is equal to y. However, for the denominator i get arcsin(3/2 sin(y)) which I'm not sure what to do with. Am I on the right path?

Nice problem, i like it. You should set up a system of 2 equations. One will be the distance when the rock falls down and the other the distance when the sound comes up. What is the relation between the two equations and what is the relation between the two times?

Oh, sorry it's B * L * V, i missinterpreted l and /. Tnx, anyway it is a stupid equation the way i wrote it, I should have seen that.

OK, so we have a stick 91cm long which is accelerated by 1m/s/s in a magnetic field B= 0.606T. I need to find the induced voltage at time t = 288ms. So U = B/V which is B/(a*t) When i calculate i get 2 Volts which i think is too much. Plus the solution should be given in mV. Is this the...