What is the radius of the spherical cavity?

AI Thread Summary
To determine the radius of the spherical cavity within the concrete chunk, the mass and volume of the chunk are essential. The chunk weighs 38 kg and has a total volume of 0.025 m³. Using the density of concrete, which can be researched, one can calculate the mass of a solid concrete chunk of the same volume. By comparing this mass to the actual mass, the volume of the cavity can be deduced, leading to the calculation of the radius. Understanding the relationship between mass, volume, and density is crucial for solving this problem.
ramalik
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An irregularly shaped chunk of concrete has a hollow spherical cavity inside. The mass of the chunk is 38 kg, and the volume enclosed by the outside surface of the chunk is 0.025 m3. What is the radius of the spherical cavity?

I think you have to find the surface area to solve for the radius and all this has to do with the density of the sphere, but I don't know how to connect it all
 
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No need to mess around with surface areas, but you do need to use the density of concrete. (Look it up!) Hint: If the chunk were solid concrete, what would be its mass?
 

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