(a) Which has greater density: 1 kg of iron or 2 kg of iron? (b) If a hollow sphere and a solid sphere are
both made of the same amount of iron, which sphere has greater average density?

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Solution

we know that
density = mass / volume

(a)
in this case the density should be same as the volume occupies by both pieces of iron would be different. The mass to volume ratio would come out to be the same.

(b)
as the mass in both cases is same and the volume of hollow sphere will be more than that of solid sphere.
So, average density of hollow sphere will be less than that of solid sphere.

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(a) Which has greater density: 1 kg of iron or 2 kg of iron? (b) If a hollow sphere and a solid sphere areboth made of the same amount of iron, which sphere has greater average density?

(a) Which has greater density: 1 kg of iron or 2 kg of iron? (b) If a hollow sphere and a solid sphere are
both made of the same amount of iron, which sphere has greater average density?