One of the important uses of the " unit radian per second " is in calculation of the power transmitted by a shaft . In the International System, widely used in physics and engineering, the power, p, delivered to the shaft is given by the product of ? ( in radians per second ) times the torque, ?, in newton-meters applied to the shaft . Thus, p = ? " ?, and the unit is the watt, with no numerical coefficient needed.
