Determine mass and force, MAE 212 questions help

Q1: Use Figure1:   A crane is used to hoist a 2000kg load upward at a constant velocity.      The jib/arm BD of the crane is 1300kg and its weight acts at point G1 (center of mass).      The jib/arm BC of the crane is 600kg and its weight acts at point G2 (center of mass).       A counterweight G3 is needed to keep the crane balanced (zero moment) as it is lifting the load.      What is the mass (in kg) of the counterweight so that the moment about point A is zero. 
Q2: Use Figure2:   Determine the moment of the force F about the door’s hinge axis.        What is the x component of the moment of the force F about point A?       What is the x component of the moment of the force F about point B?

< a href="/order">