The centre of mass of the adder is falling so the top of the ladder must also be moving down and the bottom of the ladder must be moving to the right. The frictional forces must try and oppose this motion and so must be acting upwards at the top of the ladder and to the left at the bottom of the...
The Drude model of electrical conduction has the charge carriers being accelerated by an electric field and then interacting with the lattice ions. The cycle is then repeated.
An unbound charged particle if accelerated emits electromagnetic waves.
Does that mean that a prediction of the Drude...