I'm really stuck on how to start these two questions. Could someone please give me some hints? Any help would be really appreciated. 1. A body of mass 1.5kg is placed on a plane surface inclined at 30 degrees to the horizontal. Calculate the friction and the nornal reaction which the plane must exert if the body is to remain at rest. 2. A rectangular picture, of mass 9.1kg, is suspended from a hook by two equal strings attached to its upper corners. If the tension in both strings is 49N, what is the angle between the strings? Thank you. Cathy P.S. - I've tried to draw diagrams but I don't think that they are right.