DC motor output power (Kevin Lynch)

For more information, see nu32.org. This video is a supplement to the book "Embedded Computing and Mechatronics with the PIC32 Microcontroller," Lynch, Marchuk, and Elwin. It is part of Northwestern University's ME 333 Introduction to Mechatronics.
L-comp: Output power equals torque times speed. You can also write it in terms of the torque only (maybe using the motor voltage V and the torque constant k_t). Express output power in terms of the torque.