Recent content by vodkasoup

Here is the question: I have correctly calculated the power produced by the thrust force (P = Force x Velocity = 9.0 × 104W) , the work done by the thrust force over 3 minutes (W = Power x Time = 9.0 × 104 × 3.0 × 60 = 1.6 × 107 J) , and the gain in potential energy over this period (mgh =...

Hi all, 1. Homework Statement A system of non-degenerate multi-level atoms are all in their lowest energy state. Calculate the entropy of the system. Homework Equations S = kbTln(Ω) S = Q / T dU = TdS - pdV The Attempt at a Solution I'm not sure how to proceed. I know that Ω is the...

I managed to get access to the site linked using my uni library account and read the article; however again the correction factor mentioned is not the same as that in my experiment and the method differs from what I have been asked to do. I thank you for being good enough to help me drvrm, but...

Thank you for your reply drvrm. I've read through the study you linked, and it seems to be concerned only with the determination using the Balmer series; as I mentioned, I was previously able to derive the Rydberg constant from the Balmer series of H via the same graphical method as described...

Homework Statement Not sure if this belongs in the 'Advanced' section so apologies if it does not. I am using a monochromator to measure spectrum lines from a rubidium lamp. From the data (wavelength of spectral lines plus transition number 'n') I am asked to use a graphical method to...

Thanks Chet. How do I derive voltage with respect to time? If ω=1.4V and I derive with respect to time, I just end up with 0. Though obviously I'm not doing it correctly. Also, what is the value of 'V' that I am supposed to use? The gradient of my graph?

Angular acceleration is the rate of change of angular velocity, right? But I'm still not sure how that relates to the gradient of my graph of changing voltage over time.

Homework Statement I recently conducted an experiment to determine the moment of inertia of a disc using a tachometer attached to a disc marked with reflected strips, a weight, and an oscilloscope. The resulting oscilloscope data was plugged into fitplot to generate a graph of voltage...

Ah. Whoops. Thank you very much!

Homework Statement A conducting sheet 10m x 10m x 1mm carries a charge of 1 mC. What is the electric field magnitude in kV m-1 just above the centre of the sheet?Homework Equations ρ=Q/Volume E=ρ/2ε0 The Attempt at a Solution I have arrived at an answer by the following: ρ = 1x10-3C / 10m...

Hi again! I think, for the introductory course I'm doing, the instructor setting the questions has given the force in the elastic as constant and then neglected to mention it...as the answer I get from using the above is correct, and Hooke's Law etc hasn't been covered. I shall bear it in...

Hello tiny-tim! Thanks for your reply, and please excuse my rudeness in taking so long to reply back. Ah, it seems I have been a bit silly with this one. So I use the energy, or work, done by the catapult from the point when the string is released to the point where the ball leaves the string...

Homework Statement A catapult (slingshot) is used to fire a ball of mass 0.2kg vertically into the air. The elastic is stretched so that there is a tension of 40N in both 'sides' of the slingshot, ie on the elastic on either side of the mass (I am trying to describe a diagram here, so...

Thanks for your replies ehild and eumyang, you were a great help.

Whoops...I'll blame that one on lack of sleep! ;) So I'm on the right track? The equation of the perpendicular line is now (I hope) 3x-5y-16=0.