Question

Josh's office door is 0.82 m wide, 6.0 cm thick, and  2.10 m high. The door has a mass m = 15.0 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 at rest, the door closer exerts a torque Γ = 4.50 N m. What is the smallest force that you need to apply to the door to hold it open? Enter your answer in Newtons to two significant figures, and enter only the numerical value.

Answer 1