.A 5cm x 12cm x 6.0m long wooden plank is required to stand vertically with its top 15cm 2. above the water line. This is attained by attaching 1.0cm thick steel plates to reach wider side of the plank at the submerged bottom. Compute the exact length of steel plates needed. Densities:    wood = 500 kg/cu.m    water = 1000 kg/ cu.m    steel = 7870 kg/cu.m

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