A wedge with an inclination of angle theta rests next to a wall. A block of mass m is sliding down the plane, as shown. There is no friction between the wedge and the block or between the wedge and the horizontal surface. http://session.masteringphysics.com/problemAsset/1010942/31/MFS_cf_11.jpg Find the magnitude, F_ww, of the force that the wall exerts on the wedge. ___ i know that the net force on the block is just = mgsin(theta) .. and i also know that the net horizontal force on the wedge is zero, but the problem asks for the magnitude of the force that the wall exerts on the wedge .. so i'm getting nowhere. help?