Recent content by john b

The classic picture I'm talking about is a graph of E & B on a x-y-z axis with the two sinosoidal curves in phase and perpendicular -- is it correct then to say, that the maximum values of E & B occur, at one instant, at the same locations along the Z axis but, if I graphed the fields at one...

I keep looking at a sketch of the mutually perpendicular electric & magnetic fields in an EM wave. The sketch (and my text) says they are in phase, i.e. their maximum values occur simultaneously, ... ...but the discussion centers around the changing E field producing the B field and...

try this http://www.walter-fendt.de/ph11e/projectile.htm

I would say that for a conductor (hollow or solid) the field is zero *IF* the charge on the surface (whether induced or not) is static -- if there was a field then the charges would not be static (as was mentioned before). So the assumption is that you waited to look for the field (a millionth...

Thank you -- I was looking at that earlier, but doesn't that imply that the angle from the vertex to any point equals the angle of the tangent line at a point? You replaced r with x which seems to me to say that but you started with the differential form. Thus, the right triangle composed of...

then, would you call the force exerted on a parcel of water at the surface a normal force?

[SOLVED] spinning liquid creating a parabolic shape take a container of liquid and spin it... a parcel at any given radius (r) experiences (in the rotating frame) a force outward = mass x angular speed^2 x r and a vertical force of mg. Thus the surface curves such that the tangent to the...

I think that you are confusing the force on the fly (tiny) with the effects of the force (huge acceleration, thus squish). The windscreen area the fly hits depresses a tiny bit to provide this tiny force.