A 2m long uniform bar that weighs 10N is used to hold a 3N sign. A cable is attached to one end of the bar and the cable is attached to the wall so that it is 10 degrees below the horizontal. The sign is attached 1/4 of the wy from the end of the bar with the cable. The other end of the bar is placed against the wall so that the bar makes a 25 degree angle with the horizontal.
a) what are the normal and static frictional forces on the bar at the end thouching the wall?
b) what s the minimum coefficient of static friction between the wall and the bar so that the bar won't slip?