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  4. A sphere, a cube and a thin circular plate, all of same material and same mass, are initially heated to same high temperature.

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Q. A sphere, a cube and a thin circular plate, all of same material and same mass, are initially heated to same high temperature.

Thermal Properties of Matter

Solution:

The circular plate has maximum surface area and as such it cools the fastest. For a given volume (mass in this case), a sphere has the least surface area and accordingly cools the slowest.