Here are two examples of floating objects: (a) A block of wood 20 cm long by 10 cm wide by 6 cm high has a density of and floats in water (whose density is 1.0 grams/cm3). How far below the surface of...

Here are two examples of floating objects:

(a) A block of wood 20 cm long by 10 cm wide by 6 cm high has a density of and floats in water

(whose density is 1.0 grams/cm3). How far below the surface of the water is the bottom of the block? Explain your

reasoning.

(b) An advertising blimp consists of a gas bag, the supporting structure for the gas bag, and the gondola hung from the

bottom, with its cabin, engines, and propellers. The gas bag is about 30 meters long with a diameter of about 10

meters, and it is filled with helium (density about 4 grams per 22.4 liters under these conditions). Estimate the total

mass of the blimp, including the helium.