In Fig. X3.7.9 the rectangular flashboard MN shown in cross section (a = 5.4 m) is pivoted at B.(a) What must be the maximum height of B above N if the flashboard is on the verge of tipping when the water surface rises to M? (b) If the flashboard is pivoted at the location determined in (a) and the water surface is 1 m below M, what are the reactions at B and N per m length of board perpendicular to the figure?

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in the figure, the rectangular flashboard MN shown in cross section (a=5.40m) is pivoted at B. what is the maximum height B above N if the flashboard is on the verge of tipping when the water surface rises to M?

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