A professor's office door is 0.99 m wide, 2.13 m high, and 4.29 cm thick; has a mass of 23.45 kg; and pivots on frictionless hinges. A "door closer" is attached to the door and the top of the door frame. When the door is open and is at rest, the door closer exerts a torque of 4.66 M·m. What is the least force that you need to apply to the door to hold it open?