An object is placed in a fluid and then released assume that the object either floats to the surface (settling so that the object is partly above and partly below the fluid surface) or sinks to the bottom (note that for parts a through d, you should assume that the object has settled in equilibrium)

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