A hydrometer weighs 0.022 N and has a stem at the upper end chat is cylindrical and 2.5 mm in diameter. How much deeper will it float in oil of S.G. = 0.780 than in alcohol of S.G. = 0.821? A 120 mm...

A hydrometer weighs 0.022 N and has a stem at the upper end chat is cylindrical and 2.5 mm in diameter. How much deeper will it float in oil of S.G. = 0.780 than in alcohol of S.G. = 0.821?

A 120 mm square piece of wood of S.G. = 0.75 is 1.5 m long. How many Newton’s of lead weighing 110 kN/
 must be fastened at one end of the stick so chat it will float upright with 0.3 m out of water?