Recent content by mainguy

great thanks man!

Hi physics folk, Thought you guys would be able to clarify something, self study learner here getting into quantum. So I've just learned about the De Broglie relation and The Photoelectric effect and am bamboozled (in a good way). The notion being that light is absorbed in packets. However I'm...

Hi guys, thanks for helping with this! I'm a little stuck with this question about the derivation for relativistic mass. 1. Homework Statement By considering the inelastic collision of two balls as perceived in different reference frames show that the relativistic mass is equal to the rest...

Thanks a bunch for guiding me through this, it's really helpful. So I thought the bouyant force is, taking x as the distance from the starting position where Fb = mg (L + h - x)*Aρg Where h = h0sinwt mx'' = mg - LAρg - hsinwtAρg + xAρg Then the first two terms cancel as they're equal in...

Oh ok, is it: mx'' = mg - Bouyant froce And the bouyant force varies according to sine?

Ah my bad, haha, sorry it was late. So then the equation looks fairly similar, as x is surely just hsinwt? So F = - hAρgsin(wt) If we integrate this a few times w X = C - hρgsin(wt)/Lω2 X = C - (hgT2/4π2)sin(wt) But C is 0 as at t = 0 x = 0 So amplitude is just the part out front of sin...

Thanks, so there is a restoring force proportional to the displacement from equilibrium: F = -xAρ Still no idea where to take this

In the absence of the wave surely the differential is just the bouyancy take away the weight or: mx'' = ρLAg - mg Then when the waves are added L becomes a function of t: mx'' = ρAg(L + hsin(wt)) - mg But this just leads down another dead end :/ I feel like I'm missing some fundamental...

Hi all, would appreciate a spot of help on this problem which originally comes from Feynman's introductory physics course. 1. Homework Statement 'A spar buoy of uniform cross-section floats in a vertical position with a length L submerged when there are no waves on the ocean. What is the...

So you mean to say the question is unanswerable? I'm not sure what you mean o_O

As always a fairly devious problem from Feynman, it's getting the better of me and I imagine some of you may be able to solve! Excuse the poor drawing. He writes 'Consider cylinders radius πcm, he cylinders are chopped into thirds and two thirds are connected as shown in fig. The thirds have...

So here's a mystery one of you may be able to solve. I noticed that the reflection of light from the fingerprints on my iPhone screen depend on it's orientation toward a light source. For instance, use your finger to make two perpendicular smudges across the screen. You'll find that the smudge...

Okay, you seem to have shed some light on it. So the sign of the function if obviously changing, I assume bn is the same for -6.5 as 6.5. bnsin(nx∏/3) taking x as 6.5 sure this means the value of the latter half of the equation, sin(nx∏/3), = -1/2? I'm still a bit confused here, as I...

Homework Statement This question tests your ability to find, and evaluate, a sine Fourier series of a function. f(x) = 3 Find the Fourier series for this function in the form Ʃbnsin(nx∏/3) from n = 1 to infinity Where bn = 2/3∫f(x)sin(nx∏/3).dx where the integral is from 0 to 3 What is the...

1. ei∏/3z3 = 1/(1+i) 3. Wasn't sure at all how to start...Attempted to rearrange, bringing the exponential to the right and expanding using Euler's theorem, but it didn't work. I'll be really grateful to anyone generous enough to help :) thanks