The energy generation rate for p-p fusion has an approximate dependence on density and temperature given by:
E= e (p/pc)(T/Tc)^4
i don't know how to write all the symbols so in the above:
E is epsilon, e is epsilon at the centre of the star, p is the density, pc is density at the centre...
I have tried working on this the last few days, but have been unable to decide what is going on. I know there must be an easy way to do this, but for some reason i am stuck. Any help? Thanks
Consider the Lyman photons for Hydrogen-like atoms with Z greater than one. Which of these atoms have Lyman alpha photons in the 1)visible 2)UV 3)X-ray and 4)gamma-ray parts of the spectrum? Can list ranges of values of Z in the answers.
My thoughts are to use
1/lambda=...
This is a pretty straight forward question. Does anyone know who exactly first determined the value of absolute zero and when it was. I am getting conflicting information about it.
this is not a question i have to answer, just a little bit of information i would like to include in a physics...
Question:
A typical white dwarf has a mass of 1 solar mass and a radius of 10 thousand km. A typical neutron star has a mass of 1.5 solar masses and a radius of 30km. Given that there's a natural speed limit in Nature, namely the speed of light, is it possible to have a contact binary...
just wanted to let anyone who helped out with this know that my friend and i figured out, by looking at the derivative of the answer the prof gave, that there is a typo in the original question. it should not be 5x^3 (1+x^2)^1/2, but 5x (1+x^2)^1/3. it was written in such a way that i don't...
sorry, but I'm not sure how your answer is equivalent to the answer she was given ie)15/8(1+x^2)^4/3 +C. also, i guess i wasn't clear in my last post. they haven't done trig subs, by parts, partial fractions, etc, nothing like that yet. all they have done is u subs. this isn't even my...
wow. that is unlike either answer i posted. i guess i should have stated that the only special way they have learned to solve integrals is with a u sub. did you see what exactly i did wrong in the way i tried to solve it? sometimes one needs an extra pair of eyes to find the error.
this should be easy, but I'm struggling. I'm trying to help a friend solve:
integral(5x^3(1+x^2)^1/2), sorry i don't know how to do the integral sign.
i did a u sub with u=1+x^2, du=2xdx
and u-1=x^2
so:
(5/2)integral((u-1)(u)^1/2)
i get (1+x^2)^5/2-10/6(1+x^2)^3/2 +C
the...
this is probably a stupid question, but what exactly qualifies as macroscopic ie)what is the actual range?
also, i get the question now. it was much simpler than what i was trying to make it out to be. thanks for the imput. you physics guys rock.
so the size of macroscopic objects is much larger than what the uncertainty in their positions. I'm not sure what this means in regards to quantum mechanics. i find quantum physics so confusing and i highly respect anyone who understands and enjoys it.
i have a question where it asks me to find the uncertainty in a ball's postion (m=50g). i have that part all figured out, but then it asks me what the answer indicates about the relevance of quantum mechanics to macroscopic objects. (the answer was approx. 10^-32m, a very small uncertainty)...