7.7 The center of gravity of the 50-kg spool is at G. A cable wound around the hub of the spool is attached to the 30-kg block B. The coefficients of static friction are 0.15 under the spool and 0.2 under the block. Determine the largest counterclockwise couple Co that can be applied to the spool without disturbing the equilibrium of the system 1.2 m 0.3 m G 0.6 m Co 0.5 m В 2 Fig. P7.7 7.41 The 2000-lb weight of the trailer is distributed equally between its two wheels, one on each side of the trailer. The center of gravity is at G, and the wheels are free to rotate. Determine whether the trailer can be pushed over a 6-in curb without tipping, and, if so, compute the required horizontal force P. R = 12 in P |20 in. A |-36 in.- 18 in 4 0.4 6 in Fig. P7.41