Two blocks $\backslash ($ A $\backslash )$ and $\backslash ($ B $\backslash )$ shown in $($Figure $1)$ have a weight of $10$ lb and $6$ lb $,$ respectively. They are resting on the incline for which the coefficients of static friction are $\backslash (\backslash$mu$\_\{$A$\}=0\mathrm{.}15\backslash )$ and $\backslash (\backslash$mu$\_\{$B$\}=0\mathrm{.}25\backslash ).$ Determine the angle $\backslash (\backslash$theta $\backslash )$ 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 $\backslash ($ k$=2\backslash$mathrm$\{$lb$\}/\backslash$mathrm$\{$ft$\}\backslash )$ and is originally unstretched.

Figure

Determine the smallest angle $\backslash (\backslash$theta $\backslash )$ which will cause motion of one of the blocks.

Express your answer in degrees to three significant figures.

Incorrect; Try Again; $5$ attempts remaining

Part B

Determine is the friction force under the block A at this angle.

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

Part C Determine the friction force under the block B at this angle