Edit: thread moved by mod from non technical forum, hence lack of the template.
Using arguments from MO theory, state why the trends in homonuclear bond energies for rows 1 and 3 of the periodic table in graph D differ so markedly.
S
State, with reasons, whether Si or Ge has the higher...
Homework Statement
So I'm trying to find the modulus and argument of
cosh(iπ)
Homework EquationsThe Attempt at a Solution
so far coshπi = ½(eiπ+e-iπ) I am now a bit stuck as what to do as i have two terms in the form eix and I'm not sure homework to combine them to get the argument?
so i = √-1 so i2 = -1. so 1/i must equal 1/(-1)1/2 = (-1)-1/2? is that what you were getting at fresh-_42?
So axmls 1/i = i/i^2 = -i! Thanks both of you!
Homework Statement
So this is a really simple problem and i know I'm missing something really obvious but i just can't spot it.
Homework EquationsThe Attempt at a Solution
so in the second part above I get :
e-x - ex/2i. However I don't get the next bit as the 2i on the denominator is...
So the limits would be t is from 0 to t and x from R to x which gives √R2/g2(π/2 - arcsin(x/r)) = t.
Rearranging sin(π/2 - t√(g2/R2)) = cos(t√(g2/R2) = x! Thank you! think I've finally got there!
so eventually after making substitutions i get √r/√g ∫ du/√(1-u2) = √r/√g arcsin(x/r) (where u = x/r)
and rearranging get x = Rsin(t√g/√R). However the next part of the question ( and that at t=0 c should = r) implies that it should be cos. Any ideas or have i just made a slip with signs...
Ok i still can't get this to work out:
so after integrating i get -gm/R(x2/2 -R2/2) = mv2/2
Rearranging i get v = √(gR - gx2/R) = dx/dt
Then rearranging to integrate again -
dx(gR - gx2/R)-1/2 = 1dt
and integrating
R/gx (gR - gx2/R)1/2
This isn't right but I've played around and can't get it...
Homework Statement
The question is pretty long and wordy so apologies in advance!
Inside the Earth the gravitational field falls off linearly as one approaches the centre. An accurate description of motion in a very deep hole would therefore be to use Newton’s law, f = ma, but with the force...
I think that kind of makes sense. So you can view the relative change in velocity as being greater than c but it doesn't actually go faster than c? Any chance of a hint of how to do the second part of my question?