Recent content by Brendan Graham

Regarding (a), "if I applied no external forces or torques to my system, and now the thing is spinning...", of the original post; sometime before T=1s, the experimenter compressed each of the springs with a required force, thus clearly, an external vector force (torque about the fulcrum) was...

In the TWT, a stimulus rotating EM field modulates a DC electron beam naturally accompanied by its orthogonal magnetic field, thus the modulated electron beam itself launches a generated EM field. The EM field generated by the modulated electron beam is collected by a wave guide to the device...

In the sense that one EM field is pumping another.

Assuming the base of the enclosing vessel is fixed, both hot and cool gas molecules under an external gravitational field have a fixed floor beyond which they cannot travel. Rather than coming down, more appropriately, molecules of a cooler gas just do not reach up (against the force of gravity)...

https://www.google.com/search?q=variable+capacitor&client=firefox-b-1&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjc9svnmKTZAhURtlMKHU8KCyEQsAQImwE&biw=1594&bih=848...

Isn't the high energy laser-electron interaction described in the following article and citation, the very same principle used in the classical TWT amplifier? https://phys.org/news/2018-02-intense-laser-evidence-electrons.html https://journals.aps.org/prx/pdf/10.1103/PhysRevX.8.011020