Find the answer.... A wooden log (SG = 0.7) has a cross section of 300mm * 300 mm and is 2.50 m long. It is required to float vertically in water and for this purpose it is proposed to fasten a lead prism of cross-section 300mm * 300mm to the bottom of the log. How long should be the lead prism (SG = 12) to make the log float with 0.5 m length out of water?... A wooden log (SG = 0.7) has a cross section of 300mm * 300 mm and is 2.50 m long. It is required to float vertically in water and for this purpose it is proposed to fasten a lead prism of cross-section 300mm * 300mm to the bottom of the log. How long should be the lead prism (SG = 12) to make the log float with 0.5 m length out of water?