# Search results for query: *

1. ### Simple integral

\frac{1}{z^2}\int\cos\theta d\theta \frac{1}{z^2}\sin\theta +c ?
2. ### Simple integral

x^2=z^2tan^2\theta dx=zsec^2\theta{d\theta} \int\frac{1}{(x^2+z^2)^\frac{3}{2}}dx \int\frac{zsec^2\theta}{(z^2+z^2tan^2\theta)^\frac{3}{2}}d\theta \int\frac{zsec^2\theta}{(z^2(1+tan^2\theta)^\frac{3}{2}}d\theta \int\frac{zsec^2\theta}{z^2(sec^2\theta)^\frac{3}{2}}d\theta...
3. ### Simple integral

Unfortunately I took 4+ years of university calculus over two decades ago. I've gone well beyond this but obviously haven't used these skills in a very long time, which is why I'm having trouble getting started. I'm not looking for anyone to do my homework for me, I just can't remember very much...
4. ### Simple integral

That doesn't seem right- how would that help? Seems like substitution would work here... This seems closer... \int(x^2+z^2)^\frac{-3}{2}}dx \frac{(z^2+x^2)^\frac{-1}{2}}{\frac{-1}{2}} I kind of see the \frac{x}{z^2} term, but why no \frac{x^3}{3}
5. ### Simple integral

Here's an easy one, I know the answer but can't get there... Homework Statement \int\frac{1}{(x^2+z^2)^\frac{3}{2}}dx Homework Equations na The Attempt at a Solution I know this approach is wrong, but why? Or am I not finishing somehow? \int\frac{1}{x^3}dx+\int\frac{1}{z^3}dx...
6. ### 4-momentum problem

verbatim- "Show the threshold for triplet production is 4m0c^2 using the concept of conservation of 4-momentum." Sorry for the paraphrase.
7. ### 4-momentum problem

I'm having trouble understanding conservation of 4-momentum. My problem is about dertermining the threshold for triplet production from a photon and an electron using 4-momentum conservation. The answer is 4m0c^2. So far, I say the initial energy is: E1^2=(pc)^2 + (m0c^2)^2=(hv)^2+(m0c^2)^2...
8. ### Triplet production threshold

I can understand why the threshold for pair priduction is 2m0c^2. But why is the threshold for triplet production 4m0c^2? Thanks.

I'm a bit confused about the way radiation is said to 'transfer' its energy to matter. I must be looking at it the wrong way, so I'd appreciate it if someone could explain what I am missing. I don't see how energy is transferred to atoms through ionization. The way I see it is charged...
10. ### 'simple' deacy problem

Ok, I figured it out. I need to take the binding energy and subtract it from the total mass of the separate nucleons to calculate the true mass to find Q. Hooray!
11. ### Question about nuclear cross sections

Thanks so much, you reply helped me see what I had suspected. Now on to bigger and more confusing problems...
12. ### 'simple' deacy problem

I think I am doing this correctly, but getting a strange result. Here's the original problem dealing with decay modes: The isobars 37Ar and 37Cl have binding energies/nucleon of 8.279 Mev and 8.336 Mev, respectively. Show which nuclide decay to the other spontaneously and by what decay mode...
13. ### Question about nuclear cross sections

This is a small part of a homework problem in which I need to calculate neutron flux. I have the neutron beam hitting a copper target, and two reactions take place Co-59(n,p)Co60metastable (cross section=19barn) and Co-59(n,p)Co60ground (cs=18barn). What is the cross section overall? Do I simply...
14. ### Neutron flux problem

Hello. I'm a little unsure of how to proceed on this problem... Here it is: A 3-Gev proton flux is monitored by measuring 24Na activity induced in 25 microm (6.85 microg/cm2) aluminum foil via 27Al(p, 3pn)24Na reaction (for 3 Gev protons, cross section = 9.1 mb). Exactly 15 hr after the end...
15. ### Error propagation

Always the easy things we forget... I know how errors propogate through multiplication or division when every term has an error, but how do I propagate errors in equations when only one term has an uncertainty? I want to say just multiply and divide the uncertainty value by the constants, i.e...
16. ### Adding/subtracting in polar coordinates?

Thanks. I thought that was the only way to do it. Sorry for not being so clear. I was trying to add complex numbers in the polar form.
17. ### Adding/subtracting in polar coordinates?

How do you add or subtract in polar coordinates if not given the rectangular coordinates? Thanks.