# Recent content by ness9660

1. ### Identifying an element from Emission Spectrum

I cant really find any wavelengths to compare my calculated wavelengths to, just pictures of spectra, you cant make a positive id on that. e.g. I have a blue/violet 1st order to the right of center, wave length=348.99, and to the left of center=523.359. Looking at this...
2. ### Identifying an element from Emission Spectrum

Using data collected from a spectrometer, with a diffraction grating of 100 lines/mm, I have collected a set of data. From this I have calculated wavelengths for the 1st and 2nd order lines of the three brightest visible colors, which were Blue/Violet, Green, and Orange. To complete my lab...
3. ### Isoceles triangle in absolute geometry

Im working to prove that an interior point on a chord is also interior to the circle containing the chord. Ive got the entire proof almost finished and laid out, however im stuck on one part. My proof would be complete if I could show this: Given an isoceles triangle, in absolute geometry...
4. ### Radiated power, what does this even mean?

Honestly, Im not even sure exactly what radiated power means. Why is the 18.4mW not the radiated power of the light bulb? I thought electrical energy was essentially work, which is a product of power and time, so how could radiated power be anything except 18.4mW? Are they referring to...
5. ### Electric field lines

I know that the electric field lines between two oppositely charged points are symmetric, but I cant seem tof ind any refrence as to when this symmetry breaks down. I want to say that electric field lines do not maintain symmetry if the two charges are not equal but opposite, e.g. a -4 and +4...
6. ### Coaxial pair of infinitely long charged solid conductors

A) By definition linear charge density is Q/L. So for the inner conductor with 2λ I want to say it is 2Q/infinity but this cannot be right. Im sure using Guass's law produces a correct answer but I cannot see anyway to relate it to λ or length of the conductors for that matter B) For...
7. ### Capacitors connected in series.

Well you would have \frac{1}{C_{eq}}=\frac{1}{C_1}+\frac{1}{C_2} and \frac{1}{C_{eq}}=\frac{1}{C_1}+\frac{1}{C_3} and finally \frac{1}{C_{eq}}=\frac{1}{C_1}+\frac{1}{C_2}+\frac{1}{C_3} but how could you find the final charge without using a voltage?
8. ### Capacitors connected in series.

Ive tried so many different ways using the formula for series capacitors and Q=CV and Ive had no luck solving this problem. There must be some rule (or trick) Im missing involving combing C12 and C13 that im completely missing. Can anyone offer any insight into solving this problem?
9. ### Equivalent Impedence problem

Nevermind, I feel dumb now. I completly missed that j^2=-1
10. ### Equivalent Impedence problem

Given this problem and its solution: http://img230.imageshack.us/img230/9239/quest13lf.gif [Broken] I think the given solution is wrong. The equivalent impedence is R + jwL || 1/jwC, right? When I work out jwL || 1/jwC, I get ((jwL) * (1/jwC))/ (jwL + 1/jwC) = jwL / (j(w^2)CL + 1)...
11. ### Confusion regarding sin and cos

Generally Im confused about the use of sin and cos in physics problems. http://img188.imageshack.us/img188/3162/eg2gu.gif [Broken] The torque about the beam's attachment to the wall is: T * 8 * sin(53) Where T is the tension of the wire. Why is sin the choice and not cos...
12. ### Wave length of a transverse wave

Actually I just figured it out, thanks for the help!
13. ### Wave length of a transverse wave

Thanks, after that it was easy to solve. Iam still however lost on the first problem. So is it .83333 of a cycle out of phase, but Im still unsure as how to relate this to wavelength?
14. ### Wave length of a transverse wave

For #2, here is the full question: http://img137.imageshack.us/img137/8669/q229ni.gif [Broken] As for the first problem, their cycles are out of phase (5pi/3)/2pi = .83333, right? so if the points are 30cm apart, the wavelength is .8333 *30cm?
15. ### Wave length of a transverse wave

1) A transverse wave of frequency 25 Hz propa- gates down a string. Two points 30 cm apart are out of phase by (5*pi)/3 What is the wave length of the wave? An- swer in units of cm. Im kinda lost here, Im unsure how wave length will relate to the given info. Im sure the phase is part of...