1. The problem statement, all variables and given/known data A picture frame hung against a wall is suspended by two wires attached to its upper corners. If the two wires make the same angle with the vertical, what must this angle be if the tension in each wire is equal to 0.75 of the weight of the frame. Ignore any friction between the wall and picture frame. 2. Relevant equations Newton's laws of motion. 3. The attempt at a solution The picture frame has a weight w. The question states that the tension of the wire is 0.75w. Since the picture frame has zero acceleration, it is in equilibrium. I drew a picture to clarify my thought process: http://i.imgur.com/oR8HST0.png ƩFx = 0 ƩFx = T2cos(θ) - T1cos(θ) = 0 This tells us that T2 = T1 = 0.75w ƩFy = 0 ƩFy = T1sin(θ) + T2sin(θ) - w = 0 ƩFy = T1sin(θ) + T1sin(θ) - w = 0 = 2Tsin(θ) - w = 0 = 1.5wsin(θ) = w = sin(θ) = (2/3) Taking the arcsine gives approximately 42 degrees, but the angle is 48 degrees and I can't figure out what I'm doing wrong.