# 7.7 The center of gravity of the 50-kg spool is at G. A cable wound aroundthe hub of the spool is attached to the 30-kg block B. The coefficients of staticfriction are 0.15 under the spool and 0.2 under the block. Determine the largestcounterclockwise couple Co that can be applied to the spool without disturbingthe equilibrium of the system1.2 m0.3 mG0.6 mCo0.5 mВ2Fig. P7.7 7.41 The 2000-lb weight of the trailer is distributed equally between its twowheels, one on each side of the trailer. The center of gravity is at G, and thewheels are free to rotate. Determine whether the trailer can be pushed over a 6-incurb without tipping, and, if so, compute the required horizontal force P.R = 12 inP|20 in.A|-36 in.-18 in4 0.46 inFig. P7.41

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Step 1

The coefficient of static friction is 0.15 and 0.2 under the spool and block respectively. For impending sliding the friction force is equal to its limiting value,

Step 2

The force exerted by block of mass 30 kg will be 30 x 9.81 = 294.3 N. The FBD of the block is shown as,

Step 3

Now assuming impending sli...

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