An irregularly shaped chunk of concrete has a hollow sphericalcavity inside. The

Question

An irregularly shaped chunk of concrete has a hollow sphericalcavity inside. The mass of the chunk is 20.2 kg, and the volumeenclosed by the outside surface of the chunk is 0.187m3. What is the radius of the spherical cavity? I keep getting .618 m, but it's not the answer, any help willbe much appreciated! An irregularly shaped chunk of concrete has a hollow sphericalcavity inside. The mass of the chunk is 20.2 kg, and the volumeenclosed by the outside surface of the chunk is 0.187m3. What is the radius of the spherical cavity? I keep getting .618 m, but it's not the answer, any help willbe much appreciated!

Explanation / Answer

m = 20.2 kg, V = 0.187 m3, find the radius r of thespherical cavity density = 2400 kg/m3 m = (V - 4r3/3) r = 0.349 m

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