# Search results

1. ### 3 Problems involving superposition

Isn't the \lambda for the third harmonic \frac{2L}{3}? If you use hookes law, don't we need to know the spring constant k before using this information to solve this problem?
2. ### Maxwell's Speed Distribution

Sorry to keep badgering you here, but I do not see how you get \frac{1}{2}C^{-3/2}\int_{0}^{\infty}\sqrt{x} e^{-x}dx The \sqrt{x} should be an x/C no? We let x = Cv², so that makes v² = x/C. The term you are substituting for there is v² not v. That would make the integral...
3. ### Maxwell's Speed Distribution

Oh ok, so you are saying that the original equation should be: \int 4\pi\ (\frac{M}{2\pi RT})^{3/2} \cdot v^2 \cdot e^{\frac{-Mv^2}{2RT}} dv = 1 instead of: \int 4\pi\ (\frac{M}{2\pi RT})^{3/2} \cdot v^2 \cdot e^{\frac{-Mv^2}{nRT}} dv = 1 ?
4. ### Maxwell's Speed Distribution

Thanks for the reply, but I still seem to be a little lost. If I let C = \frac{M}{2RT} , that leaves me with 4 \pi \cdot ( \frac{C}{ \pi})^{3/2} \int \frac{x}{C} ... . I don't see how making the C = \frac{M}{2RT} helps me in the latter half of the integral because I have a n term in there...
5. ### Maxwell's Speed Distribution

Homework Statement Given Maxwell's probability distribution function, P(v) = 4\pi\ (\frac{M}{2\pi RT})^{3/2} \cdot v^2 \cdot e^{\frac{-Mv^2}{nRT}} Where v = velocity, M = molar mass, R = Universal Gas Constant, n = # of mols, T = temperature, solve \int P(v) dv =1 from 0 to...
6. ### Experimental Proof of Electrical Charge

Hi, I have a question about the transfer of electrical charge from object to another. Basically, my professor stated that if you rub a rod with certain matierials, the rod will become charged. This is due to the convention that Ben Franklin came up with called the triboelectric series. So...
7. ### Find the Potential as a function of position

Homework Statement A rod of length L carries a charge Q uniformly distributed along its length. The rod lies along the y-axis with one end at the origin. Find the potential as a function of position along the x-axis Homework Equations dV=\vec{E}\cdotp d\vec{l} V=\frac{kq}{r}...
8. ### Force of gravity if the Earth's radius, r = r/2

Oh cool, thanks neutrino, that way is much easier. Thanks!
9. ### Force of gravity if the Earth's radius, r = r/2

Oh my... so simple huh?! ^_^ Thank you. It looks like I calculated the radius of the Earth in meters when it should have been kilometers!! Thanks for seeing that for me.
10. ### Force of gravity if the Earth's radius, r = r/2

Problem: Suppose that the Earth retained its present mass but was somehow compressed to half its present radius. What would be the value of g at the surface of this new, compact planet? My work: So, this seems pretty simple, and I get the right answer, but I seem to be off by a lot of...
11. ### Newtons Law problem

Oh ok, I see. One question, in problem a) why does T1sin60 = T2? Does this always hold true?
12. ### Newtons Law problem

Actually, I did draw the FBD. It is just a little hard to show on the forum so I did not show it. But just so you believe me, here it is, or what I think it should be. http://answerboard.cramster.com/answer-board/image/f82c0c65fe75d2ff30bd3844a0167c55.jpg [Broken] Here is my work...
13. ### Newtons Law problem

Yeah, I drew the free body diagrams, and that is how I figured out the parts that I did, but I am still stuck on the others.
14. ### Newtons Law problem

Hello, I have a question with a simple Tension - Mass problem. Here is the question: For the systems in Equilibrium, find the unknown tensions and masses. a) http://answerboard.cramster.com/answer-board/image/ed663c5fcb01e8fb6c7522cf963b49f1.jpg [Broken] b)...
15. ### Basic Kinematics Question

So that's it? Just do it mathmatically and it is fine? Awesome, I solved for the intersection time to be .6 hours and then plugged that back into my equation for Car A and got a distance of 4.8 km. Does that sound good? Thank you for your help Bishop!!
16. ### Basic Kinematics Question

Hello, I am having an issue with this simple kinematics problem. I have the question visualized, well, at least I think I do. Here is the question: Two cars are traveling along a straight road. Car A maintains a constand speed of 80 km/h; car B maintains a constant speed of 110 km/h...