Question

4. A 70. kg painter paints the side of a house while standing on a 5.5 m long board resting (centered) on a 2.5 m Wide scaffold. The board has a mass of 12 kg. The scaffold is made of iron pipe with a cross-sectional area of 45 cm supporting each side of the board. Ignore the effects of the cross braces. Find a) how close to the left end of the board the painter can stand without tipping the board over b) the stress and strain in the left end scaffold vertical support pipe when the painter is standing 1.8 m from the left end of the board c) the center of mass of the board and painter system when the painter is standing 1.8 m from the left end.