Part A

The two blocks used in a measuring device have negligible weight. The spring is compressed $4\mathrm{.}5$ in $.$ when in the position shown. The end of the screw is smooth and the coefficient of static friction at all other points of contact is $\backslash (\backslash$mu$=0\mathrm{.}21\backslash ).($Figure $1)$

Determine the smallest axial force $\backslash ($ P $\backslash )$ which the adjustment screw must exert on $\backslash ($ B $\backslash )$ in order to start the movement of $\backslash ($ B $\backslash )$ downward.

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

$\backslash [$

P$=$

$\backslash ]$ Figure

$1$ of $1$