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Q: Illustrate on an Argand diagram vectors representing complex numbers z+w and z-w, for any complex number z and w. a) If |z| = |w| what can be said about arg [ (z-w)/(z+w) ]? I can see that the question is about rhombus properties: the diagonals of rhombus perpendicularly bisect. My question...

you revived an ancient thread btw

More importantly, gamma rays have high energy which is why they are dangerous. Gamma rays have sufficient penetrating power to go through the skin. Now compare this to radio waves. Higher penetrating power but less energy. Not dangerous.

Noo attenuation is mainly caused by spreading out of waves and then secondarily absorption of the waves. So for sound waves, they attenuate because they spread out in space.

The intensity of the EM wave follows the inverse square law. This is simply because the measured intensity at a point away from the EM wave source is weaker due to the EM waves spreading out. However, the individual EM waves that have spread out will continue to propagate forever. The reason...

Modulation is the storing of information in EM waves; I don't think it affects propagation. In fact, EM waves should propagate forever so long as they are not absorbed. The reason why a signal (i.e. modulated wave) loses strength is because of attenuation (the signal spreading out and being...

Thanks! That helped a lot

Q: "If O,A,P,Q respectively represent complex numbers 0, 1, z1, z2, construct the point R so that △OAP is similar to △ORQ. Find the complex number represented by R. A: R = z1/z2. Now, consider arg(R) = arg z1 - arg z2 My diagram: Notice how this will result in arg(r) = arg z1 + arg z2 which...

There's also what power of 2,5,7,13 is a divisor of 100!

Oh two separate questions: 1. what power of 2 is a divisor of 10! 2. what power of 10...

How do I do this Q? Find what power of 2,10 is a divisor of 10! (I'm assuming highest power but the question doesn't say)

I was at a chemistry competition held at one of the uni's and a lot of the selective (or private) schools which I won't name were acting very elitist to lesser schools.

Why do you just spoon feed answers?

-_- I've been so consistent all year and the ONE TIME my mind chooses to burn out on me is right before trials. Jeez. Looking at work makes me sick now

I consider maths to be my best subject but I hate it.... Edit: Too repetitive for my liking

Re: Why is it current that kills? Why is AC more dangerous than DC - damage to the bo So both are dangerous in their own rights; you cannot definitively say one is more dangerous than the other. Is this correct? I'm just confused because people always talk about this type of stuff. No need to...

Re: Why is it current that kills? Why is AC more dangerous than DC - damage to the bo Oh yeah Edison** So both are dangerous in that they can cause electrocution, but AC seems more dangerous based off what rumbleroar said about? Is this correct?

Re: Why is it current that kills? Why is AC more dangerous than DC - damage to the bo One is definitely more dangerous than the other (relates to the Edison vs Westinghouse electrical debate)

Just look at the math lol... this has nothing to do with T.Lee or some textbook. OP found a contradiction in two different, (seemingly) valid methods and that's the problem