Two blocks A and B shown in $($Figure $1)$ have a weight of $9$ lb and $6$ lb$,$ respectively. They are resting on the incline for which the coefficients of static friction are A $=0\mathrm{.}17$ and B $=0\mathrm{.}23.$ Determine the angle which will cause motion of one of the blocks. What is the friction force under each of the blocks when this occurs? The spring has a stiffness of k $=2$ lb$/$ft and is originally unstretched. Figure

Determine is the friction force under the block $\backslash ($ B $\backslash )$ at this angle.

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

$\backslash [$

F$\_\{$B$\}=\backslash$square

$\backslash ]$

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