1. The problem statement, all variables and given/known data W is 8 units in the y-z plane in a direction defined by theta = 120 degrees with respect to the y axis and have a positive z component. 2. Relevant equations Wy=Wsin(theta) R^(2)=Rx^(2)+Ry^(2)+Rz^(2) 3. The attempt at a solution Wy=Wsin(theta) Wy=8sin(120) =6.9 8^(2)=Sqrt(0^(2)+(6.9)^(2)+(Rz)^(2)) Rz=4.04 units. is this par right? I am not sure how to approach this one. I only how how to deal with x and y axis but not z. Can sombody point me in the right direction? thanks!