Part A

Two blocks A and $B$ shown in $($Eigure $1)$ have a weight of $11$ lb and $6$ lb $,$ respectively. They are resting on the incline for which the coefficients of static friction are ${}_A=0\mathrm{.}15$ and ${}_B=0\mathrm{.}27.$ 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 $k=2l\frac{b}{f}t$ and is originally unstretched.

Figure

$1$ of $1$

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$$

Determine the smallest angle $$ which will cause motion of one of the blocks.

Express your answer in degrees to three significant figures.

$$

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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.

$F_A=$

$$

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Part C

Determine is the friction force under the block $B$ at this angle.

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

$F_B=$

$$

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