Whats the deffinition for energy

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

Which lists the organs in the correct order as food passes from the mouth to anus?

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?