Q. A professor's office door is 0.90 wide, 2.2 high, 4.2 thick; has a mass of 23 , and pivots on frictionless hinges. A "door closer" is attached to door and the top of the door frame. When the door is open and at rest, the door closer exerts a torque of 5.8 .
Q. A driver becomes lost and travels 12.0 km west, 5.o km south, and 8.0 km east. Find the magnitude and direction of the car's displacement from the starting place.