Recent content by -sandro-

Hi, yes by amplitude I mean the actual physical amplitude of a wave as you described. :) Tomorrow I'm going to send an email to my professor because I clearly remember he said that (while showing the video) in class.

Ok, so what about this video example? It clearly shows amplitudes are higher at longer distances for surface waves.

OK so we all know that seismic waves decrease in amplitude at about 1/r, the decay is slower than P and S-waves but it's there. So how do you explain that when I see examples of seismograms of the same earthquake from stations at different distance you can sometimes notice that surface waves...

Homework Statement Find the potential of a fluid whose density varies with height according to this relation: ρ = a (H-z2) + 1.5 kg/m3 being H=20m, 15m <= z <= 20m, Mtotal= 200kg. The fluid is inside a cylinder of radius = 2m and height = 5m. Homework Equations Bernoulli equation...

Hello, I was reading articles about EMR and health and I realized I never got how "output power" is related to frequency. Let's talk about energy, the rule is: the higher the frequency (shorter wavelength) the higher is the energy transported by the wave. Now power, power is the energy...

I didn't can you please tell me what equation you used to find the time to fall to point D? For the change in ME from D to E seems like you're confirming what I already said, good!:D

I haven't yet because I wasn't able to get the equation for distance in respect to time to find the time and plug it into the velocity equation. Also I'm very confused about final speed at E after DE, I know that at point D the centripetal force will be mV^2/R being V the speed found after the...

I'm having problems with finding the velocity at D. At class we've been told what the drag force is and how to find the terminal velocity of a point mass object which g/Cd that would equal to 19.6m/s. But how do I get the speed after 2m knowing the terminal velocity?

Thank you! about the curved path, doesn't sliding a circular path downwards increase its Angelita speed due to gravity?

humm I think I just got it wrong. I thought that having a centripetal acceleration would increase the tangential velocity from D to E but that actually keeps it constant ( uniform circular motion) so If I have the initial velocity at D (considering the drag force) so the weight at E would the...

Reviewing the drawing it seems like the scale is positioned at the end of the curved surface so the centripetal force will matter to measure the weight. Is that what you meant? Basically I'm getting that by weight the question is asking what is the F of the centripetal force. Weight = Force =...

It's only between C e D then the ball will follow the curved path with no external force. In what way does centripetal force affect the speed of the object when it goes to E?

I'm a little familiar with the drag force, so I have to find the velocity at point E? Is weight measured affected at all by the velocity? I find it odd the professor i just asking for a simple "m times g" :D I think the part I can't really solve is the curved path where I'm given the R (i...

OK, sorry but this is the first time I use elastic potential energy. Any help about the following questions? I have no idea how to proceed. And thank you"!

I get a value of K = 27048N/m...isn't this too high? maybe wrong calculations