The pin support $\backslash ($ A $\backslash )$ and roller support $\backslash ($ B $\backslash )$ of the bridge truss are supported on concrete abutments. The bearing failure stress of the concrete is $\backslash (\backslash$left$(\backslash$sigma$\_\{\backslash$text $\{$fail $\}\}\backslash$right$)\_\{$b$\}=4\backslash$mathrm$\{$ksi$\}\backslash ).$ Apply a factor of safety of $2$ against failure. $($Figure $1)$

Figure

Part A

Determine the required minimum dimension of the square bearing plate at $\backslash ($ C $\backslash ).$

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

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Part B

Determine the required minimum dimension of the square bearing plate at $\backslash ($ D $\backslash ).$

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

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