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.