The square$-$threaded bolt is used to join two plates together as shown in $($Figure $1).$ The bolt has a mean diameter of $45$ mm

and a lead of $3$ mm

$.$ The tension in the bolt is $18$ kN

$.$ The coefficient of static friction between the threads and the bolt is $\backslash$mu s

$=0\mathrm{.}15.$

Figure$1$ of $1$

Two horizontal plates are held together by a vertical bolt with a mean diameter d and a moment M acting counterclockwise around the bolt as seen from below.

Part A

Determine the smallest torque M

required to loosen the bolt.

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

Activate to select the appropriates template from the following choices. Operate up and down arrow for selection and press enter to choose the input value typeActivate to select the appropriates symbol from the following choices. Operate up and down arrow for selection and press enter to choose the input value type

M

$=$

nothing