1. The problem statement, all variables and given/known data a weight fastened to a roof 35 degrees above the horizontal, the weight is directed downward, in order that the unit not crush the roof tiles the component perpendicular to the roof can not exceed 425 N, What is the maximum allowed weight of the unit? 2. Relevant equations Cos ... etc 3. The attempt at a solution OK so lets name the force straight down which i will call W the force perpendicular to the horizontal plane is 425 N i will call that J so we find that angle between vector W and B is 35 degrees. so i use cos(35)=W/J Jcos(35)=W which means the force down is 348 N which issss.... WRONG :( tips would be great i really dont understand this .