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1. ### A How to reduce an integral in phase space to a one-dimensional form?

It is indeed a decay process of the form ##1\rightarrow 2##, in particular, a Higgs decaying to an electron pair. You're suggesting using the same procedure of going into the Higgs CoM frame on the last equation? Nonetheless, I have no idea on how to move on from there.

45. ### 4-disk Squared Gyroscope problem

Homework Statement A rigid, square-shaped, structure with negligible mass contains 4 disks in rotation as you can see in the figure. Each disk has mass m, moment of inertia I about its rotation axis and angular velocity ws. Also, the plane of the structure coincides with the horizontal plane...
46. ### Gyrocompass motion: Zero torque in the free axis

Ah yes, of course! My bad! Thank you! :)
47. ### Gyrocompass motion: Zero torque in the free axis

Oh! Indeed! It is that simple. And so, the sum of all contributions to the torque along that axis equals the cross product R x F, in this case is zero, since the angle between R and F is zero. Thank you!.
48. ### Gyrocompass motion: Zero torque in the free axis

Hi! At the moment I'm studying rigid body motion, more specifically, the gyrocompass. As you can see in the attached picture (Introduction to Mechanics -Kleppner-Kolenkow-Chap.7), the gyrocompass rotates about the z axis and the spin angular momentum is reoriented towards the z axis, creating a...