A sphere, a cube and a thin circular plate all made of the same material and having the same mass, are initially heated to a temperature of 2000C. Which of these objects will cool slowest when left in air at room temperature?
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a
the sphere
b
the cube
c
the circular plate
d
all will cool at same rate
answer is A.
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Detailed Solution
Rate of cooling ∝ surface area and for a given mass, surface area of sphere is minimum.