(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 25 m long with a diameter of about 13 m, and it is filled with helium (density about 4 g per 22.4 l under these conditions). Estimate the total mass of the blimp, including the helium. (Assume the blimp is in the shape of a cylinder, and that the density of air is 1.2 kg/m3.)

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