Thanks. I copied and pasted from Word and assume the bold was inherited from the the 3 titles in the template. Apologies for that.
I cannot work out to insert nice equations like the two that you have inserted above. And yes, I need to prove that:
E(Xr)=Γ((r/B)+1) - your first equation
When I...
Homework Statement
I have f(x) = BxB-1e-x^B
I need to show that E(Xr) = Ƭ(Gamma)(R/B + 1)
Homework Equations
I know that E(Xr) = f(x)
The Attempt at a Solution
Attempt at part of solution
I started by saying let u = xB so du = BxB-1dx
Can I say then that if u = xB, then Xr = ur/B...
However, if I have ∫BxB-1 e-xB dx, can I not integrate by substitution?
Let u = xB so du = BxB-1dx which gives:
∫e-udu and therefore the answer is -e-xB + c
I know that is not correct, but I thought I could integrate by either substitution OR parts? This integration is key to me understanding...
ok. I have integrated ∫xn ex using parts and I get:
xn ex - ∫exnxn-1 this equates (I hope) to:
ex(xn - nxn-1) this can be simplified obvs. Is this correct?
Thanks
Hi. I think I jumped too eagerly into my latest module, as I am positive it makes many assumptions on previous experience. I am obviously lacking.
I have created a question in Word, but the equations don;t appear to be copying into this thread. So I have uploaded question instead. If this is...
Hi
The question is about diseased trees in an area (Poisson process), and states that λ = 15 diseased trees in a km square. I need to calculate expected distance from a point in the square to a diseased tree.
Now I thought that this means that P(diseased tree = 0) ~ Po(15) = 3.059 x 10^-7
Or...
Thank-you both. For some reason I was making it way more complicated than it needed to be. Going to work through a few more examples now.
Again, a huge thanks :)
Thanks v much. I cannot find this in my notes at all. Assuming the -108V is due to 3sf? Rather than my 108.5V?
So 150V at the origin. I then resolve in the x and y direction. Cannot work out though why it is 150V - 150V -108V, when we're looking at the +x/y directions? Like I said, this should...
Homework Statement
In a certain region of space, there is a uniform electric field of magnitude
25.0 V m^-1 directed at 30.0 degrees to the direction of the positive x-axis and at 60.0 degrees to the direction of the positive y-axis. (There is no z component of the electric field.) The electric...
I have a complete brain freeze sorry, and cannot work this out.
I have a helium atom of 4.0 amu and there are 6.0 x 10^24 atoms. How do I calculate the total mass in kg please?
Thanks