When a bow is used, it is important that an arrow is on the string when the
string is released. If the
string is pulled back and
released without an arrow, the bow will likely get damaged and the archer will likely get hurt.
However, if an arrow is used with the bow,
releasing the pulled back string makes the
arrow fly. Use what you have learned about
energy to explain why it is so important to
have an arrow on the string.

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