Hello, I recently walked through the gates of my local library with my hard drive magnets clipped onto my fingers, and I noticed that they were vibrating. I've been looking on the internet and I also found radio-frequency identification systems. Could someone please explain the physics behind...
If the big grey box is one tonne, and the pivot, the small white circle has a diameter of 1 meter, how do I calculate the torque needed to turn it 360 degrees? Do i just use T=FD? but then I don't have the acceleration.