Part A

Two blocks A and $B$ shown in $($Figure $1)$ have a weight of

$9lb$ and $5lb,$ respectively. They are resting on the incline

for which the coefficients of static friction are ${}_A=0\mathrm{.}13$

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

Figure

$1$ of $1$

$1$ of $1$

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

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

$F_B=$

Part C

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

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

$F_A=$

Part B

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