A 7.5 kg block is attached to a horizontally mounted spring with a spring constant of 750 J/m2 . The block is released from rest with the spring extended by 15 cm from its normal length. The block then oscillates back and forth along a horizontal and frictionless surface. How long will it take this system to complete one full oscillation?

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