(Answered) Three solid cubes all made from the same uniform material

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Three solid cubes all made from the same uniform material are fused together to form a single symmetric tower (as seen in attached picture). The bottom cube "B" is 2cm on a side, the middle cube "M" is 4cm, and the top "T" is 6cm.

(a) What is the height of the center of gravity (above the 2cm base)?

(b) If the tower is placed on an 11° incline, will it tip over (assume that it does not slide: calculation must be shown)?

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