Recent content by mathilin

Homework Statement Assume that a point source of light gives 3 watt = 3 J/s of light energy. a) assume uniform radiation in all dirrections, find the light intensity in ev/m2*s b)Assuming some reasonable size for an atom, **** the energy/time incident on the atom for this intensity.Homework...

Got it, thanks for the help.

Maybe i oculd just do 1760-1320=440 (is this the fundamental frequency?)

This just tells me what i already know. I don't know the tension in the string, and can't solve for the velocity, so I'm back to square one.

Homework Statement a 32 cm violin string with linear mass density is .36 gm/m is placed near a loudspeaker that is fed by an audio oscillator of variable frequency. It is found that hte string is set into oscillations at frequencies 1320 Hz and 1760 Hz as the frequency of the audio oscillator...

ohh, it makes so much sense once I see it mapped out. Thanks for all of your help, I'll do the other state now!

It might by the -F of the spring, because F=-kx. If this were true, I don't see how this would help though. Assuming that is correct the equation would reduce to. (1/2)*k*(A^2 + F + ΔL^2) + mg(h+A)

Yea here it is verbatim. A mass "m" is attached to the free end of a light vertical spring (unstretched length l) of spring constant "k" and suspended form a ceiling. The spring stetches delta L under the load and comes to equlibrium at a height "h" above the ground level (y=0). The mass is...

Yes exactly, I just phrased it poorly.

A is just the distance that it moves up or down in either dirrection. For example, at its max height, h is h+A.

Homework Statement I have to prove that the total energy of a spring mass system is equal to (1/2)k(delta L^2 + A^2) The spring is in three sates, equilibrium (I proved that already), maximally stretched, and maximally compressed. The spring is at equilibrium at a height h above ground level...