Recent content by quantumworld

Hey, u could join the GRE yahoo group, they have all the test posted.

Thank u Tide I did solve it! :biggrin: I used the formula (Mgd/I)^.5 where I = I of the first mass + I of the second mass and Mgd is like the reduced mass times its distance from the pivot. so the key thing to remember, is that, when we calculate I, we do it separately for each mass, and...

A long, straight, and massless rod pivots about one end in a vertical plane. In configuration I, two small identical masses are attached to the free end; in configuration II, one mass is moved to the center of the rod. What is the ratio of the frequency of small oscillations of configuration II...

:biggrin: I thought they are the same, because we eat pies at pi day :biggrin: .

yes indeed, thank u Pat, it is clear now :approve: . I don't know what I was thinking when I said photon energies couldn't be different. Thank u for clearing that up. But for some reason, I thought that a pion traveling in the K direction could decay into 2 photons that arent in the k...

I will surely wait, thank u so much! :smile:

Pat, I think I lost u :( I understand that the vector sum is less than the sum of the magnitudes, but doesn't mean that they are opposite in direction, it just means that there is an angle between them, but not necessarily opposite in direction. And also, I thought that all photons will...

A Pie zero meson ( rest-mass energy 135 Mev) is moving with velocity .8c K in the laboratory rest frame when it decays into 2 photons, gamma1 and gamma2. In the pie zero rest frame, gamma1 is emitted forward and gamma2 is emitted backward relative to the pie zero direction of flight. The...

Here is a question that I am having a hard time understanding. 75) the period of a hypothetical Earth satellite orbiting at sea level would be 80 minutes. In terms of the Earth's radius Re, the radius of a synchronous satellite orbit ( period 24 hours) is mostly: (A) 3 Re (B) 7 Re (C) 18...

thanks Norman for the input, I did write it in terms of estates, and I got that m = 1, thus evalues should be 1, -1 , 0, but I think I missed something here... :bugeye:

52) At a given instant of time, a rigid rotator is in the state psi(theta,phi) = (3/4)^.5 sin(theta)sin(phi), where theta is the polar angle relative to the z-axis and phi is the azimuthal angle. Measurement will find which of the following possible values of the z-component of the angular...

THank you Healey, and ehild ! :smile: I do remember something about this mirror image, and now I got it right, but it is kindof a magical solution, instead of dealing with the mess of charges on the conducting plate, we could treated as a mirror image, I wonder how did they come up with...

exactly...

Dear reader, here is a question that I stumbled upon, and I would like some insight on it :bugeye: two positive charges q and 2q coulombs are located on the x-axis at x = .5a and 1.5a, respectively. There is an infinite, grounded conduction plane at x =0. What is the magnitude of the...

are u doing part a? are u sure they are asking for the force, or for the work done...?