# A solid disk with a radius of 18 m and mass of 6 kg is rotating on a frictionless surface. If 480 W of power is used to increase the disk's rate of rotation, what torque is applied when the disk is rotating at 3 Hz?

$\text{25.5 Nm}$
$\text{Power = Torque × Angular speed}$
$\text{Torque" = "Power"/"Angular speed" = "480 Watt"/"2 π × 3 Hz" = "25.5 Nm}$