Recent content by strawman

y(x,t) = 1/2 h(x-vt) + 1/2 h(x+vt) This is from the textbook "quantum mechancs" by Rae. The derivative is given as dy/dt = -v1/2 h(x-vt) + v1/2 h(x+vt) I'm not quite sure how this is? If I use the chain rule and set the function h(x-vt) = u Then by dy/dt = dy/du x du/dt I will get (for the...

Thanks, that's a great check!

This is rewording of a question on a test I've just done. A vinyl record on a turntable has radius R=0.15 m, mass M=1.5 kg. The angular speed is reduced from 33.3 rev per minute to zero as a result of an applied torque, in 7 seconds. Moment of inertia given as I=1/2 M R^2 Calculate a) angular...

Thanks for the reply. I thought about posting in the homework forum, though it isn't actually a homework question, I just made up the values to see if I had the idea right. But it does follow the same pattern as many questions. Not sure how to delete or move the thread?

Hi everyone. I'm a new poster here, so hopefully this is in the right sub forum: I'm just interested in seeing if I've got the right idea with my differentiation of magnetic flux in order to find the induced current in a ring of wire, which has it's normal at, say 30° to a magnetic field (which...