1. The problem statement, all variables and given/known data A string is hung over a fixed pulley, and a mass of m3 is suspended from one end of the string. The other end of the string supports a massless pulley, over which a second string is hung. This string has a m2 mass attached to one end, and a m1 mass attached to the other end. Find an equation between m1, m2 and m3 that makes the m3 still. 2. Relevant equations F=ma 3. The attempt at a solution I took the upward as positive direction of y. and wrote these equations based on F=ma for each mass: m3: [tex]T_1 - m_3g=m_3 a_3[/tex] m2: [tex]T_2 - m_2g=m_2 a_2[/tex] m1: [tex]T_2 - m_1g=m_1 a_1[/tex] but I can't find out how to make m3 still.