$7\mathrm{.}17$ A $5$ in$-$diameter pipe is supported every $9$ ft by a small frame consisting of two members as shown. Knowing that the combined weight of the pipe and its contents is $\backslash (10\backslash$mathrm$\{$lb$\}/\backslash$mathrm$\{$ft$\}\backslash )$ and neglecting the effect of friction, determine the magnitude and location of the maximum bending moment in member $\backslash ($ A C $\backslash ).$

Fig. P$7.$

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$7\mathrm{.}18$ For the frame of $\backslash (\backslash$operatorname$\{$sr$\}\backslash )$ Prob. $7\mathrm{.}17,$ determine the magnitude and location of the maximum bending moment in member $\backslash ($ B C $\backslash )$