A student nails a meter stick to a board at the meter stick's 0.0-m mark. A force A of 10 N acts at the 0.5-m mark perpendicular to the meter stick as shown in the figure. Force B of 5 N acts at the end of the meter stick, making a 30˚ angle, as shown. Force C of 20 N acts at the same point providing tension but no shear. (Use counterclockwise to be positive.)
What is the torque of force C about the fixed point?