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Q.

A sphere, a cube and a thin circular plate all made of the same mass and finish are heated to a temperature of 200oC; which of these objects will cool slowest when left in air atroom temperature ?

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a

The sphere

b

The cube

c

The circular Plate

d

All will cool at the same rate

answer is A.

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Detailed Solution

Sphere has minimum surface area hence it takes more time to cool at same rate.
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A sphere, a cube and a thin circular plate all made of the same mass and finish are heated to a temperature of 200oC; which of these objects will cool slowest when left in air atroom temperature ?