1. The problem statement, all variables and given/known data To prove that system will travel freely upto 180 degree m2 is counterweight and m1 is mass of pan (=3kg) i have attched the fbd or another link http://www.imagebam.com/image/54bb5a394377595 2. Relevant equations m1(h + a sin θ) g x = m2 y h g m2 = 9.13 kg 3. The attempt at a solution we are stuck at the following equation Pwg ≥( m1 x^2 + m2 y^2) sin2 θ / [ x(h-xsin2 θ)] LHS is weight of pan and arm and if LHS>RHS, system will rotate freely is this correct? can you pls explain it properly because it will clear my concepts. Thanks.