Question $2(20$ points$)$: The length of the $2$ mm diameter wire CD has been adjusted so that, with no load applied, the gap between end $B$ of the rigid beam ACB and platform $E$ is $1\mathrm{.}5$ mm $.$ Assume the elastic modulus of the wire is $E=200$GPa and the mass of the block is unknown.

Question $2$A $(10$ of $20$ points$)$: The block's location $x$ is adjusted until point $B$ just contacts the platform at $E.$ If this location is $x=0\mathrm{.}2m,$ determine the mass of the block.