The volume of 1 kg of helium in a piston–cylinder device is initially 5 m3. now helium is compressed to 2 m3 while its pressure is maintained constant at 130 kpa. determine the initial and final temperatures of helium as well as the work required to compress it, in kj. the gas constant of helium is r = 2.0769 kj/kg·k.

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