Question

Block A of weight 500 N and block B of weight 700 N are connected by rope pulley system as shown. The largest weight C that can be suspended without moving block A and B is W. The coefficient of friction for all plane surfaces of contact is 0.3. The pulleys are ideal. Find W/90.

Answer 1

3T + 0.3 × 1200 = m_c g = w 

and T = μ(500) 

 = 0.3 × 500

w = m₀ g = 810 N