As you stand on the sidewalk outside an apartment building, a 2.0-kg bird flies toward you at 3.5 m/salong a straight line that passes 3.0 m above your head and runs parallel to the street. a friend is reclining with his head 4.0 m directly above your head, watching from a balcony. what angular momentum do you observe the bird to have, using your head as a reference point? what angular momentum does your friend observe the bird to have, using his own head as a reference point?

It may seem strange that the selected velocity does not depend on either the mass or the charge of the particle. (for example, would the velocity of a neutral particle be selected by passage through this device? ) the explanation of this is that the mass and the charge control the resolution of the device--particles with the wrong velocity will be accelerated away from the straight line and will not pass through the exit slit. if the acceleration depends strongly on the velocity, then particles with just slightly wrong velocities will feel a substantial transverse acceleration and will not exit the selector. because the acc