A uniform plank AB AB\,AB has length 5 m and mass 8 kg. The plank rests horizontally on two supports M M\,M and NNN, where AM=0.5AM = 0.5AM=0.5 m and AN=4AN = 4AN=4 m.
Find the magnitude of the reactions of the support at M M\,M and NNN.
A block is now placed at B B\,B and the plank is on the point of tilting about NNN. Find the weight of the block.
Find the magnitude of the reaction at NNN.
