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An irregularly shaped chunk of concrete has a hollow spherical cavity inside. The mass of the chunk is 33 kg, and the volume enclosed by the outside surface of the chunk is 0.025 m3. What is the radius (in m) of the spherical cavity? A sample of oil in a cylindrical container is placed on a mass balance. The cylinder has a mass of 125 g and a radius of 4.2 cm. There is a bubble with a radius of 3 cm midway up the cylinder of oil. The reading on the balance is 1 kg, and the oil fills the measuring cylinder up to a height of 25 cm. Which of the following is most nearly the density of the oil? 600 kg/m3 700 kg/m3 800 kg/m3 900 kg/m3 1000 km/m3