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The homogeneous disk of mass $m$ is resting on the right$-$angled supporting surfaces shown. The tension $P$ in the cord is very gradually increased from zero. If the friction at both A and $B$ is characterized by ${}_s=0\mathrm{.}4,$ what happens first $-$ does the homogeneous disk slip in place or does it begin to roll up the incline? Determine the value of $P$ at which this first movement occurs.

Assume $=38.$

Answer: $P=$ mg