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Blocks in $($Eigure $1)$ A and $B$ have a mass of $9$ kg and $10$ kg $.$ respectively.

Part A

Using the coefficients of static friction indicated, determine the largest force $P$ which can be applied to the cord without causing motion. There are pulleys at $C$ and D$.$

Express your answer to three significant figures and include the appropriate units.

$P=$

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Figure

$1$ of $1$